diff --git a/libcpu/arm/AT91SAM7S/context_gcc.S b/libcpu/arm/AT91SAM7S/context_gcc.S
index e18dcfa6eaa02f668ecca67b6abf9dd781729e8f..e76093f8be31b1462d6aa63d424cd696c144a533 100644
--- a/libcpu/arm/AT91SAM7S/context_gcc.S
+++ b/libcpu/arm/AT91SAM7S/context_gcc.S
@@ -75,16 +75,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr		r2, =rt_thread_switch_interrput_flag
+	ldr		r2, =rt_thread_switch_interrupt_flag
 	ldr		r3, [r2]
 	cmp		r3, #1
 	beq		_reswitch
-	mov		r3, #1							/* set rt_thread_switch_interrput_flag to 1 */
+	mov		r3, #1							/* set rt_thread_switch_interrupt_flag to 1 */
 	str		r3, [r2]
 	ldr		r2, =rt_interrupt_from_thread	/* set rt_interrupt_from_thread */
 	str		r0, [r2]
diff --git a/libcpu/arm/AT91SAM7S/context_rvds.S b/libcpu/arm/AT91SAM7S/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..e24fa62a3dd5dd1f46ed2c32255752e171173e46 100644
--- a/libcpu/arm/AT91SAM7S/context_rvds.S
+++ b/libcpu/arm/AT91SAM7S/context_rvds.S
@@ -84,17 +84,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/AT91SAM7S/interrupt.c b/libcpu/arm/AT91SAM7S/interrupt.c
index b8ef0c051cc4df06e13fcfc8b2ef81bd866ce74a..cd80a5d408e00c370ea1b4b975b0428d4f4441e6 100644
--- a/libcpu/arm/AT91SAM7S/interrupt.c
+++ b/libcpu/arm/AT91SAM7S/interrupt.c
@@ -20,7 +20,7 @@
 extern rt_uint32_t rt_interrupt_nest;
 
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /**
  * @addtogroup AT91SAM7
@@ -48,7 +48,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/arm/AT91SAM7S/start_gcc.S b/libcpu/arm/AT91SAM7S/start_gcc.S
index bcfbc261cab49474e9c73ceac8da93e86cbc1d02..17695e31f2bc5a1079722f2f389f5bbef1b53833 100644
--- a/libcpu/arm/AT91SAM7S/start_gcc.S
+++ b/libcpu/arm/AT91SAM7S/start_gcc.S
@@ -164,7 +164,7 @@ vector_resv : b vector_resv
 
 .globl rt_interrupt_enter
 .globl rt_interrupt_leave
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 vector_irq:
@@ -174,10 +174,10 @@ vector_irq:
 	bl	rt_interrupt_leave
 
 	/* 
-	 * if rt_thread_switch_interrput_flag set, jump to
+	 * if rt_thread_switch_interrupt_flag set, jump to
 	 * rt_hw_context_switch_interrupt_do and don't return
 	 */
-	ldr	r0, =rt_thread_switch_interrput_flag
+	ldr	r0, =rt_thread_switch_interrupt_flag
 	ldr	r1, [r0]
 	cmp	r1, #1
 	beq	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/AT91SAM7S/start_rvds.S b/libcpu/arm/AT91SAM7S/start_rvds.S
index 64d65b6fbf64cca13fff1e76b947984772950c52..a4e403c1af615841d91eb448b7cdff45e9d5855d 100644
--- a/libcpu/arm/AT91SAM7S/start_rvds.S
+++ b/libcpu/arm/AT91SAM7S/start_rvds.S
@@ -408,7 +408,7 @@ MC_RCR  EQU     0x00            ; MC_RCR Offset
 
 				IMPORT rt_interrupt_enter
 				IMPORT rt_interrupt_leave
-				IMPORT rt_thread_switch_interrput_flag
+				IMPORT rt_thread_switch_interrupt_flag
 				IMPORT rt_interrupt_from_thread
 				IMPORT rt_interrupt_to_thread
 				IMPORT rt_hw_trap_irq
@@ -420,9 +420,9 @@ IRQ_Handler		PROC
 				BL	rt_hw_trap_irq
 				BL	rt_interrupt_leave
 
-				; if rt_thread_switch_interrput_flag set, jump to
+				; if rt_thread_switch_interrupt_flag set, jump to
 				; rt_hw_context_switch_interrupt_do and don't return
-				LDR	r0, =rt_thread_switch_interrput_flag
+				LDR	r0, =rt_thread_switch_interrupt_flag
 				LDR	r1, [r0]
 				CMP	r1, #1
 				BEQ	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/AT91SAM7X/context_gcc.S b/libcpu/arm/AT91SAM7X/context_gcc.S
index 83e9f057558bf774f24e0e9b4f953c864be45055..e8f080359e19efd1b377189aca1259bc82474b05 100644
--- a/libcpu/arm/AT91SAM7X/context_gcc.S
+++ b/libcpu/arm/AT91SAM7X/context_gcc.S
@@ -80,16 +80,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr r2, =rt_thread_switch_interrput_flag
+	ldr r2, =rt_thread_switch_interrupt_flag
 	ldr r3, [r2]
 	cmp r3, #1
 	beq _reswitch
-	mov r3, #1				@ set rt_thread_switch_interrput_flag to 1
+	mov r3, #1				@ set rt_thread_switch_interrupt_flag to 1
 	str r3, [r2]
 	ldr r2, =rt_interrupt_from_thread	@ set rt_interrupt_from_thread
 	str r0, [r2]
diff --git a/libcpu/arm/AT91SAM7X/context_rvds.S b/libcpu/arm/AT91SAM7X/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..641ec7a6b1a18b5d8fff4b927e2ad5549ca65f01 100644
--- a/libcpu/arm/AT91SAM7X/context_rvds.S
+++ b/libcpu/arm/AT91SAM7X/context_rvds.S
@@ -12,12 +12,12 @@
 ; * 2009-01-20     Bernard      first version
 ; */
 
-NOINT	EQU		0xc0	; disable interrupt in psr
+NOINT	EQU		0xc0	; disable interrupt in psr
 
-	AREA |.text|, CODE, READONLY, ALIGN=2
-	ARM
-	REQUIRE8
-	PRESERVE8
+	AREA |.text|, CODE, READONLY, ALIGN=2
+	ARM
+	REQUIRE8
+	PRESERVE8
 
 ;/*
 ; * rt_base_t rt_hw_interrupt_disable();
@@ -26,16 +26,16 @@ rt_hw_interrupt_disable	PROC
 	EXPORT rt_hw_interrupt_disable
 	MRS r0, cpsr
 	ORR r1, r0, #NOINT
-	MSR cpsr_c, r1
+	MSR cpsr_c, r1
 	BX	lr
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_interrupt_enable(rt_base_t level);
 ; */
 rt_hw_interrupt_enable	PROC
 	EXPORT rt_hw_interrupt_enable
-	MSR cpsr_c, r0
+	MSR cpsr_c, r0
 	BX	lr
 	ENDP
 
@@ -63,7 +63,7 @@ rt_hw_context_switch	PROC
 	MSR	cpsr_cxsf, r4
 
 	LDMFD	sp!, {r0-r12, lr, pc}	; pop new task r0-r12, lr & pc
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_context_switch_to(rt_uint32 to);
@@ -79,29 +79,29 @@ rt_hw_context_switch_to	PROC
 	MSR	cpsr_cxsf, r4
 
 	LDMFD	sp!, {r0-r12, lr, pc}	; pop new task r0-r12, lr & pc
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
-	IMPORT rt_interrupt_to_thread
+	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
 _reswitch
 	LDR r2, =rt_interrupt_to_thread		; set rt_interrupt_to_thread
-	STR r1, [r2]
+	STR r1, [r2]
 	BX	lr
-	ENDP
-
+	ENDP
+
 	END
\ No newline at end of file
diff --git a/libcpu/arm/AT91SAM7X/interrupt.c b/libcpu/arm/AT91SAM7X/interrupt.c
index c61a6dc551cc603e1acbc3bc1f43d608d285ceec..d3cbbcda2e4ecab2fdd08819c7e440575e988afa 100644
--- a/libcpu/arm/AT91SAM7X/interrupt.c
+++ b/libcpu/arm/AT91SAM7X/interrupt.c
@@ -20,7 +20,7 @@
 extern rt_uint32_t rt_interrupt_nest;
 
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /**
  * @addtogroup AT91SAM7
@@ -48,7 +48,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
@@ -56,11 +56,11 @@ void rt_hw_interrupt_init()
  * @param vector the interrupt number
  */
 void rt_hw_interrupt_mask(int vector)
-{
+{
 	/* disable interrupt */
-	AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
+	AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
 
-	/* clear interrupt */
+	/* clear interrupt */
 	AT91C_BASE_AIC->AIC_ICCR = 1 << vector;
 }
 
diff --git a/libcpu/arm/AT91SAM7X/start_gcc.S b/libcpu/arm/AT91SAM7X/start_gcc.S
index 9c09bfc7fd344a9a68e716bda2750eaddc1fa9a4..119f3cdbf3f4a58a7cc6e190b5b5d901597fd916 100644
--- a/libcpu/arm/AT91SAM7X/start_gcc.S
+++ b/libcpu/arm/AT91SAM7X/start_gcc.S
@@ -206,7 +206,7 @@ vector_resv : b vector_resv
 
 .globl rt_interrupt_enter
 .globl rt_interrupt_leave
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 vector_irq:
@@ -216,10 +216,10 @@ vector_irq:
 	bl	rt_interrupt_leave
 
 	/* 
-	 * if rt_thread_switch_interrput_flag set, jump to
+	 * if rt_thread_switch_interrupt_flag set, jump to
 	 * rt_hw_context_switch_interrupt_do and don't return
 	 */
-	ldr	r0, =rt_thread_switch_interrput_flag
+	ldr	r0, =rt_thread_switch_interrupt_flag
 	ldr	r1, [r0]
 	cmp	r1, #1
 	beq	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/AT91SAM7X/start_rvds.S b/libcpu/arm/AT91SAM7X/start_rvds.S
index bc5c6e9ccefb2e059021ad76b64c8312b386ac92..eaee2a39eab2f09adc8e6697fa3bb861ec67db81 100644
--- a/libcpu/arm/AT91SAM7X/start_rvds.S
+++ b/libcpu/arm/AT91SAM7X/start_rvds.S
@@ -411,7 +411,7 @@ MC_RCR  EQU     0x00            ; MC_RCR Offset
 
 				IMPORT rt_interrupt_enter
 				IMPORT rt_interrupt_leave
-				IMPORT rt_thread_switch_interrput_flag
+				IMPORT rt_thread_switch_interrupt_flag
 				IMPORT rt_interrupt_from_thread
 				IMPORT rt_interrupt_to_thread
 				IMPORT rt_hw_trap_irq
@@ -438,9 +438,9 @@ IRQ_Handler		PROC
 				BL	rt_hw_trap_irq
 				BL	rt_interrupt_leave
 
-				; if rt_thread_switch_interrput_flag set, jump to
+				; if rt_thread_switch_interrupt_flag set, jump to
 				; rt_hw_context_switch_interrupt_do and don't return
-SWITCH			LDR	r0, =rt_thread_switch_interrput_flag
+SWITCH			LDR	r0, =rt_thread_switch_interrupt_flag
 				LDR	r1, [r0]
 				CMP	r1, #1
 				BEQ	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/PK40X25VLQ100/context_rvds.S b/libcpu/arm/PK40X25VLQ100/context_rvds.S
index 46b2e0673747a533b734397b28ef110f9eaf83f6..69bed5810563dbe5a6b0dbf55118c3692adb7c1f 100644
--- a/libcpu/arm/PK40X25VLQ100/context_rvds.S
+++ b/libcpu/arm/PK40X25VLQ100/context_rvds.S
@@ -29,7 +29,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -62,8 +62,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -94,11 +94,11 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CBZ		r1, pendsv_exit			; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOV		r1, #0x00
 	STR		r1, [r0]
 
@@ -144,7 +144,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOV 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/PK40X25VLQ100/interrupt.c b/libcpu/arm/PK40X25VLQ100/interrupt.c
index 8cf81a620fbe8aba0bd6d1022150c3e0b119e81f..5db4eaef3e1cc6623af3e8d12f7ea6278910a6c8 100644
--- a/libcpu/arm/PK40X25VLQ100/interrupt.c
+++ b/libcpu/arm/PK40X25VLQ100/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/at91sam926x/context_gcc.S b/libcpu/arm/at91sam926x/context_gcc.S
index e90ec49d5ed1784d1a27ee2f3baef50aefa0bd31..e53e1260dd901183545d9f3012187b4d32c54781 100755
--- a/libcpu/arm/at91sam926x/context_gcc.S
+++ b/libcpu/arm/at91sam926x/context_gcc.S
@@ -81,16 +81,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr r2, =rt_thread_switch_interrput_flag
+	ldr r2, =rt_thread_switch_interrupt_flag
 	ldr r3, [r2]
 	cmp r3, #1
 	beq _reswitch
-	mov r3, #1				@ set rt_thread_switch_interrput_flag to 1
+	mov r3, #1				@ set rt_thread_switch_interrupt_flag to 1
 	str r3, [r2]
 	ldr r2, =rt_interrupt_from_thread	@ set rt_interrupt_from_thread
 	str r0, [r2]
diff --git a/libcpu/arm/at91sam926x/context_rvds.S b/libcpu/arm/at91sam926x/context_rvds.S
index 60aaa37acd65bc0dc790b805fc7ef0364c0ca097..8f7bab61ef2d6bc3862c58a0eae0bdc05f01b20d 100644
--- a/libcpu/arm/at91sam926x/context_rvds.S
+++ b/libcpu/arm/at91sam926x/context_rvds.S
@@ -12,12 +12,12 @@
 ; * 2011-08-14     weety    copy from mini2440
 ; */
 
-NOINT	EQU		0xc0	; disable interrupt in psr
+NOINT	EQU		0xc0	; disable interrupt in psr
 
-	AREA |.text|, CODE, READONLY, ALIGN=2
-	ARM
-	REQUIRE8
-	PRESERVE8
+	AREA |.text|, CODE, READONLY, ALIGN=2
+	ARM
+	REQUIRE8
+	PRESERVE8
 
 ;/*
 ; * rt_base_t rt_hw_interrupt_disable();
@@ -26,16 +26,16 @@ rt_hw_interrupt_disable	PROC
 	EXPORT rt_hw_interrupt_disable
 	MRS r0, cpsr
 	ORR r1, r0, #NOINT
-	MSR cpsr_c, r1
+	MSR cpsr_c, r1
 	BX	lr
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_interrupt_enable(rt_base_t level);
 ; */
 rt_hw_interrupt_enable	PROC
 	EXPORT rt_hw_interrupt_enable
-	MSR cpsr_c, r0
+	MSR cpsr_c, r0
 	BX	lr
 	ENDP
 
@@ -63,7 +63,7 @@ rt_hw_context_switch	PROC
 	MSR	cpsr_cxsf, r4
 
 	LDMFD	sp!, {r0-r12, lr, pc}	; pop new task r0-r12, lr & pc
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_context_switch_to(rt_uint32 to);
@@ -79,29 +79,29 @@ rt_hw_context_switch_to	PROC
 	MSR	cpsr_cxsf, r4
 
 	LDMFD	sp!, {r0-r12, lr, pc}	; pop new task r0-r12, lr & pc
-	ENDP
+	ENDP
 
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
-	IMPORT rt_interrupt_to_thread
+	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
 _reswitch
 	LDR r2, =rt_interrupt_to_thread		; set rt_interrupt_to_thread
-	STR r1, [r2]
+	STR r1, [r2]
 	BX	lr
-	ENDP
-
+	ENDP
+
 	END
diff --git a/libcpu/arm/at91sam926x/interrupt.c b/libcpu/arm/at91sam926x/interrupt.c
index 392b46902ef861356c24305c9af3023288d1875c..31e49283dd01eebad1c2ab718b319eb1bd7a7bc6 100755
--- a/libcpu/arm/at91sam926x/interrupt.c
+++ b/libcpu/arm/at91sam926x/interrupt.c
@@ -22,7 +22,7 @@ extern rt_uint32_t rt_interrupt_nest;
 /* exception and interrupt handler table */
 rt_isr_handler_t isr_table[MAX_HANDLERS];
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 
 /* --------------------------------------------------------------------
@@ -201,7 +201,7 @@ void rt_hw_interrupt_init(void)
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 static void at91_gpio_irq_mask(int irq)
diff --git a/libcpu/arm/at91sam926x/start_gcc.S b/libcpu/arm/at91sam926x/start_gcc.S
index 47d25f1280cbe3a3d88bed2f84e350e01d30142a..b9c6be4a354b493e6904903ddc0d073602181f64 100755
--- a/libcpu/arm/at91sam926x/start_gcc.S
+++ b/libcpu/arm/at91sam926x/start_gcc.S
@@ -285,7 +285,7 @@ vector_resv:
 
 .globl 		rt_interrupt_enter
 .globl 		rt_interrupt_leave
-.globl 		rt_thread_switch_interrput_flag
+.globl 		rt_thread_switch_interrupt_flag
 .globl 		rt_interrupt_from_thread
 .globl 		rt_interrupt_to_thread
 vector_irq:
@@ -294,8 +294,8 @@ vector_irq:
 	bl		rt_hw_trap_irq
 	bl		rt_interrupt_leave
 
-	/* if rt_thread_switch_interrput_flag set, jump to _interrupt_thread_switch and don't return */
-	ldr		r0, =rt_thread_switch_interrput_flag
+	/* if rt_thread_switch_interrupt_flag set, jump to _interrupt_thread_switch and don't return */
+	ldr		r0, =rt_thread_switch_interrupt_flag
 	ldr		r1, [r0]
 	cmp		r1, #1
 	beq		_interrupt_thread_switch
@@ -311,7 +311,7 @@ vector_fiq:
 	subs	pc,lr,#4
 
 _interrupt_thread_switch:
-	mov		r1,  #0					/* clear rt_thread_switch_interrput_flag*/
+	mov		r1,  #0					/* clear rt_thread_switch_interrupt_flag*/
 	str		r1,  [r0]
 
 	ldmfd	sp!, {r0-r12,lr}		/* reload saved registers			*/
diff --git a/libcpu/arm/at91sam926x/start_rvds.S b/libcpu/arm/at91sam926x/start_rvds.S
index bc2a0cc871a9c0da3f03e228b9bf512672d54916..7fdb08b30a2c8496f2dcc780b9e9014e3d209490 100644
--- a/libcpu/arm/at91sam926x/start_rvds.S
+++ b/libcpu/arm/at91sam926x/start_rvds.S
@@ -222,7 +222,7 @@ Reset_Handler
 
                 IMPORT rt_interrupt_enter
                 IMPORT rt_interrupt_leave
-                IMPORT rt_thread_switch_interrput_flag
+                IMPORT rt_thread_switch_interrupt_flag
                 IMPORT rt_interrupt_from_thread
                 IMPORT rt_interrupt_to_thread
                 IMPORT rt_hw_trap_irq
@@ -234,9 +234,9 @@ IRQ_Handler     PROC
                 BL  rt_hw_trap_irq
                 BL  rt_interrupt_leave
 
-                ; if rt_thread_switch_interrput_flag set, jump to
+                ; if rt_thread_switch_interrupt_flag set, jump to
                 ; rt_hw_context_switch_interrupt_do and don't return
-                LDR r0, =rt_thread_switch_interrput_flag
+                LDR r0, =rt_thread_switch_interrupt_flag
                 LDR r1, [r0]
                 CMP r1, #1
                 BEQ rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/cortex-m3/context_gcc.S b/libcpu/arm/cortex-m3/context_gcc.S
index c4e2d60fb5281acc4213f3fd8299a772210256ea..a0914749042be26667df1134d8ae286f6879fe43 100644
--- a/libcpu/arm/cortex-m3/context_gcc.S
+++ b/libcpu/arm/cortex-m3/context_gcc.S
@@ -66,8 +66,8 @@ rt_hw_interrupt_enable:
 	.type rt_hw_context_switch, %function
 rt_hw_context_switch_interrupt:
 rt_hw_context_switch:
-	/* set rt_thread_switch_interrput_flag to 1 */
-	LDR 	R2, =rt_thread_switch_interrput_flag
+	/* set rt_thread_switch_interrupt_flag to 1 */
+	LDR 	R2, =rt_thread_switch_interrupt_flag
 	LDR 	R3, [R2]
 	CMP 	R3, #1
 	BEQ 	_reswitch
@@ -98,11 +98,11 @@ PendSV_Handler:
 	CPSID	I
 
 	/* get rt_thread_switch_interrupt_flag */
-	LDR		R0, =rt_thread_switch_interrput_flag
+	LDR		R0, =rt_thread_switch_interrupt_flag
 	LDR		R1, [R0]
 	CBZ		R1, pendsv_exit			/* pendsv aLReady handled */
 
-	/* clear rt_thread_switch_interrput_flag to 0 */
+	/* clear rt_thread_switch_interrupt_flag to 0 */
 	MOV		R1, #0
 	STR		R1, [R0]
 
@@ -146,7 +146,7 @@ rt_hw_context_switch_to:
 	STR		R0, [R1]
 
 	/* set interrupt flag to 1 */
-	LDR 	R1, =rt_thread_switch_interrput_flag
+	LDR 	R1, =rt_thread_switch_interrupt_flag
 	MOV 	R0, #1
 	STR 	R0, [R1]
 
diff --git a/libcpu/arm/cortex-m3/cpuport.c b/libcpu/arm/cortex-m3/cpuport.c
index b8532408e3feba98f2ed1ad361c4edb9d1175cb0..c36edb853a8580e56a964925b04d6c0bfa59ebf9 100644
--- a/libcpu/arm/cortex-m3/cpuport.c
+++ b/libcpu/arm/cortex-m3/cpuport.c
@@ -42,7 +42,7 @@ struct stack_contex
 /* Private variables ------------------------------------------------------------*/
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /* Private function prototypes ---------------------------------------------------*/
 /* Private functions ------------------------------------------------------------*/
diff --git a/libcpu/arm/lm3s/context_gcc.S b/libcpu/arm/lm3s/context_gcc.S
index 99e76ba8f62f258d8855ac7f7b6c4fe3a4a2fa24..0afc1cd87c06d031a8304a6b4abc93c48db775ed 100644
--- a/libcpu/arm/lm3s/context_gcc.S
+++ b/libcpu/arm/lm3s/context_gcc.S
@@ -59,8 +59,8 @@ rt_hw_interrupt_enable:
 
 rt_hw_context_switch_interrupt:
 rt_hw_context_switch:
-	/* set rt_thread_switch_interrput_flag to 1 */
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	/* set rt_thread_switch_interrupt_flag to 1 */
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -91,11 +91,11 @@ rt_hw_pend_sv:
 	CPSID	I
 
 	/* get rt_thread_switch_interrupt_flag */
-	LDR	r0, =rt_thread_switch_interrput_flag
+	LDR	r0, =rt_thread_switch_interrupt_flag
 	LDR	r1, [r0]
 	CBZ	r1, pendsv_exit			/* pendsv already handled */
 
-	/* clear rt_thread_switch_interrput_flag to 0 */
+	/* clear rt_thread_switch_interrupt_flag to 0 */
 	MOV	r1, #0x00
 	STR	r1, [r0]
 
@@ -139,7 +139,7 @@ rt_hw_context_switch_to:
 	STR	r0, [r1]
 
 	/* set interrupt flag to 1 */
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOV 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/lm3s/context_rvds.S b/libcpu/arm/lm3s/context_rvds.S
index 6432965f575e764c9cd42e8c07755f6db17380a9..b4c795e9ac8a1070e8efe02f300e7c6b04f28426 100644
--- a/libcpu/arm/lm3s/context_rvds.S
+++ b/libcpu/arm/lm3s/context_rvds.S
@@ -27,7 +27,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -60,8 +60,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -92,11 +92,11 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CBZ		r1, pendsv_exit			; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOV		r1, #0x00
 	STR		r1, [r0]
 
@@ -143,7 +143,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR		r1, =rt_thread_switch_interrput_flag
+	LDR		r1, =rt_thread_switch_interrupt_flag
 	MOV		r0, #1
 	STR		r0, [r1]
 
diff --git a/libcpu/arm/lm3s/interrupt.c b/libcpu/arm/lm3s/interrupt.c
index 3f6165a255036aad8597d5f8dc4395c5a9cf132e..f4cc2b13128fbf9f09d87ad3f0a66615244ea1d9 100644
--- a/libcpu/arm/lm3s/interrupt.c
+++ b/libcpu/arm/lm3s/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/lpc1100/context_rvds.S b/libcpu/arm/lpc1100/context_rvds.S
index 9eb913f27a80b0960876054b1a39cc4e91ebd75b..097f43bf8590cc65766105e77a4bfc6bb4c914a0 100644
--- a/libcpu/arm/lpc1100/context_rvds.S
+++ b/libcpu/arm/lpc1100/context_rvds.S
@@ -27,7 +27,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -60,8 +60,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -92,12 +92,12 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CMP		r1, #0x00
 	BEQ		pendsv_exit				; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOVS	r1, #0x00
 	STR		r1, [r0]
 
@@ -146,7 +146,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOVS 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/lpc1100/interrupt.c b/libcpu/arm/lpc1100/interrupt.c
index a1a3eb24416085c734f0bcfebfda978696bf12ee..ce43a7781a1b70f0b5cdde1f4d602246ff94086a 100644
--- a/libcpu/arm/lpc1100/interrupt.c
+++ b/libcpu/arm/lpc1100/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint8_t rt_thread_switch_interrput_flag;
+rt_uint8_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/lpc122x/context_rvds.S b/libcpu/arm/lpc122x/context_rvds.S
index 9eb913f27a80b0960876054b1a39cc4e91ebd75b..097f43bf8590cc65766105e77a4bfc6bb4c914a0 100644
--- a/libcpu/arm/lpc122x/context_rvds.S
+++ b/libcpu/arm/lpc122x/context_rvds.S
@@ -27,7 +27,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -60,8 +60,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -92,12 +92,12 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CMP		r1, #0x00
 	BEQ		pendsv_exit				; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOVS	r1, #0x00
 	STR		r1, [r0]
 
@@ -146,7 +146,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOVS 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/lpc122x/interrupt.c b/libcpu/arm/lpc122x/interrupt.c
index a1a3eb24416085c734f0bcfebfda978696bf12ee..ce43a7781a1b70f0b5cdde1f4d602246ff94086a 100644
--- a/libcpu/arm/lpc122x/interrupt.c
+++ b/libcpu/arm/lpc122x/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint8_t rt_thread_switch_interrput_flag;
+rt_uint8_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/lpc17xx/context_iar.S b/libcpu/arm/lpc17xx/context_iar.S
index 3c8f2d35999467ad5436eca1cab6bb8e30f227a1..5333a3452f95ac709eac20d6f4702f25be89e230 100644
--- a/libcpu/arm/lpc17xx/context_iar.S
+++ b/libcpu/arm/lpc17xx/context_iar.S
@@ -29,7 +29,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -61,8 +61,8 @@ rt_hw_interrupt_enable:
 rt_hw_context_switch_interrupt:
 rt_hw_context_switch:
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -92,11 +92,11 @@ rt_hw_pend_sv:
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CBZ		r1, pendsv_exit			; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOV		r1, #0x00
 	STR		r1, [r0]
 
@@ -141,7 +141,7 @@ rt_hw_context_switch_to:
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOV 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/lpc17xx/context_rvds.S b/libcpu/arm/lpc17xx/context_rvds.S
index b59c5da3da7f03225f351276b69f91609e9fb86c..48f34d520aab826ae80f1c3a32c38e5948cb34d8 100644
--- a/libcpu/arm/lpc17xx/context_rvds.S
+++ b/libcpu/arm/lpc17xx/context_rvds.S
@@ -28,7 +28,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -61,8 +61,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -93,11 +93,11 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CBZ		r1, pendsv_exit			; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOV		r1, #0x00
 	STR		r1, [r0]
 
@@ -143,7 +143,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOV 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/lpc17xx/interrupt.c b/libcpu/arm/lpc17xx/interrupt.c
index 8cf81a620fbe8aba0bd6d1022150c3e0b119e81f..5db4eaef3e1cc6623af3e8d12f7ea6278910a6c8 100644
--- a/libcpu/arm/lpc17xx/interrupt.c
+++ b/libcpu/arm/lpc17xx/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/lpc214x/context_gcc.S b/libcpu/arm/lpc214x/context_gcc.S
index 3a77976073beadc7bdc4972fefca15c0f87c50f3..0a4b1ce7312fed69ef681bf65993e1c84ecc81be 100644
--- a/libcpu/arm/lpc214x/context_gcc.S
+++ b/libcpu/arm/lpc214x/context_gcc.S
@@ -84,11 +84,11 @@ rt_hw_context_switch_to:
 
 rt_hw_context_switch_interrupt:
 	//EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]						/* 载入中断中切换标致地址 */
 	CMP r3, #1							/* 等于 1 ？*/
 	BEQ _reswitch						/* 如果等于1，跳转到_reswitch*/
-	MOV r3, #1							/* set rt_thread_switch_interrput_flag to 1*/
+	MOV r3, #1							/* set rt_thread_switch_interrupt_flag to 1*/
 										/* 设置中断中切换标志位1 */
 	STR r3, [r2]						/* */
 	LDR r2, =rt_interrupt_from_thread	/* set rt_interrupt_from_thread*/
diff --git a/libcpu/arm/lpc214x/context_rvds.S b/libcpu/arm/lpc214x/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..e24fa62a3dd5dd1f46ed2c32255752e171173e46 100644
--- a/libcpu/arm/lpc214x/context_rvds.S
+++ b/libcpu/arm/lpc214x/context_rvds.S
@@ -84,17 +84,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/lpc214x/cpuport.c b/libcpu/arm/lpc214x/cpuport.c
index 3af1d61a727361d7ce34c3ed114010aadac49b67..702db0b21e72bf4951a7c49c1e5ef3b51222a6e7 100644
--- a/libcpu/arm/lpc214x/cpuport.c
+++ b/libcpu/arm/lpc214x/cpuport.c
@@ -65,7 +65,7 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 void rt_hw_interrupt_handler(int vector)
 {
@@ -99,7 +99,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/arm/lpc214x/start_rvds.S b/libcpu/arm/lpc214x/start_rvds.S
index 9d603a4709c6c2b367b80df7b976907c1be5b576..50e3fdcf947c008c1b6bf3ea0e20c168818c1d19 100644
--- a/libcpu/arm/lpc214x/start_rvds.S
+++ b/libcpu/arm/lpc214x/start_rvds.S
@@ -417,7 +417,7 @@ MEMMAP          EQU     0xE01FC040      ; Memory Mapping Control
 
 				IMPORT rt_interrupt_enter
 				IMPORT rt_interrupt_leave
-				IMPORT rt_thread_switch_interrput_flag
+				IMPORT rt_thread_switch_interrupt_flag
 				IMPORT rt_interrupt_from_thread
 				IMPORT rt_interrupt_to_thread
 				IMPORT rt_hw_trap_irq
@@ -429,9 +429,9 @@ IRQ_Handler		PROC
 				BL	rt_hw_trap_irq
 				BL	rt_interrupt_leave
 
-				; if rt_thread_switch_interrput_flag set, jump to
+				; if rt_thread_switch_interrupt_flag set, jump to
 				; rt_hw_context_switch_interrupt_do and don't return
-				LDR	r0, =rt_thread_switch_interrput_flag
+				LDR	r0, =rt_thread_switch_interrupt_flag
 				LDR	r1, [r0]
 				CMP	r1, #1
 				BEQ	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/lpc214x/startup_gcc.S b/libcpu/arm/lpc214x/startup_gcc.S
index 33073c8da5c64943cc29cd837dc7b85425f30a4d..1c25f3bd2ea0acee3764b0a59816750c718928fa 100644
--- a/libcpu/arm/lpc214x/startup_gcc.S
+++ b/libcpu/arm/lpc214x/startup_gcc.S
@@ -2,7 +2,7 @@
 
 	.extern rt_interrupt_enter
 	.extern rt_interrupt_leave
-	.extern rt_thread_switch_interrput_flag
+	.extern rt_thread_switch_interrupt_flag
 	.extern rt_interrupt_from_thread
 	.extern rt_interrupt_to_thread
 	.extern rt_hw_trap_irq
@@ -224,8 +224,8 @@ IRQ_Handler :
 		bl	rt_hw_trap_irq		 			   /* 相应中断服务例程处理  	    */
 		bl	rt_interrupt_leave		           /* ; 通知RT-Thread要离开中断模式 */
 
-		/* 如果设置了rt_thread_switch_interrput_flag，进行中断中的线程上下文处理 */
-		ldr	r0, =rt_thread_switch_interrput_flag
+		/* 如果设置了rt_thread_switch_interrupt_flag，进行中断中的线程上下文处理 */
+		ldr	r0, =rt_thread_switch_interrupt_flag
 		ldr	r1, [r0]
 		cmp	r1, #1
 		beq	rt_hw_context_switch_interrupt_do  /* 中断中切换发生 */
diff --git a/libcpu/arm/lpc24xx/context_gcc.S b/libcpu/arm/lpc24xx/context_gcc.S
index c83ac53dfc399fb3fce33edd467d777ad45bd391..df22aacbed6a66a60f3c015e0dbd351130c4626a 100644
--- a/libcpu/arm/lpc24xx/context_gcc.S
+++ b/libcpu/arm/lpc24xx/context_gcc.S
@@ -80,16 +80,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr r2, =rt_thread_switch_interrput_flag
+	ldr r2, =rt_thread_switch_interrupt_flag
 	ldr r3, [r2]
 	cmp r3, #1
 	beq _reswitch
-	mov r3, #1				@ set rt_thread_switch_interrput_flag to 1
+	mov r3, #1				@ set rt_thread_switch_interrupt_flag to 1
 	str r3, [r2]
 	ldr r2, =rt_interrupt_from_thread	@ set rt_interrupt_from_thread
 	str r0, [r2]
diff --git a/libcpu/arm/lpc24xx/context_rvds.S b/libcpu/arm/lpc24xx/context_rvds.S
index c889e9328160ea88213b19f2e7627b9e96282ed6..4d77f6591b97685682593262d641abb8b0cfdc3c 100644
--- a/libcpu/arm/lpc24xx/context_rvds.S
+++ b/libcpu/arm/lpc24xx/context_rvds.S
@@ -87,17 +87,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/lpc24xx/interrupt.c b/libcpu/arm/lpc24xx/interrupt.c
index d697fb1c528e8de0668f7cf5e5cf0f2a78e1732b..b18c1e10ffaffb1652694eab551c4ba554afba84 100644
--- a/libcpu/arm/lpc24xx/interrupt.c
+++ b/libcpu/arm/lpc24xx/interrupt.c
@@ -21,7 +21,7 @@ extern rt_uint32_t rt_interrupt_nest;
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 
 /**
@@ -57,7 +57,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 void rt_hw_interrupt_mask(int vector)
diff --git a/libcpu/arm/lpc24xx/start_gcc.S b/libcpu/arm/lpc24xx/start_gcc.S
index 370ffffdeba94c2f4c0b2f0bf0d139a045a41572..feab6f021673e4f29093d6e36f1db7db464a2642 100644
--- a/libcpu/arm/lpc24xx/start_gcc.S
+++ b/libcpu/arm/lpc24xx/start_gcc.S
@@ -189,7 +189,7 @@ vector_resv:    bl rt_hw_trap_resv
 
 .globl rt_interrupt_enter
 .globl rt_interrupt_leave
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 vector_irq:     
@@ -198,10 +198,10 @@ vector_irq:
         bl      rt_hw_trap_irq
         bl      rt_interrupt_leave
 
-        /* if rt_thread_switch_interrput_flag set,
+        /* if rt_thread_switch_interrupt_flag set,
          * jump to _interrupt_thread_switch and don't return
          */
-        ldr     r0, =rt_thread_switch_interrput_flag
+        ldr     r0, =rt_thread_switch_interrupt_flag
         ldr     r1, [r0]
         cmp     r1, #1
         beq     _interrupt_thread_switch
@@ -217,7 +217,7 @@ vector_fiq:
         subs    pc,lr,#4
 
 _interrupt_thread_switch:
-        mov     r1, #0          /* clear rt_thread_switch_interrput_flag */
+        mov     r1, #0          /* clear rt_thread_switch_interrupt_flag */
         str     r1, [r0]
 
         ldmfd   sp!, {r0-r12,lr} /* reload saved registers */
diff --git a/libcpu/arm/lpc24xx/start_rvds.S b/libcpu/arm/lpc24xx/start_rvds.S
index 1b166b133e307ae850415250bdc19bddc207fe33..312df25f268dc462f431b73e05273366874de3bd 100644
--- a/libcpu/arm/lpc24xx/start_rvds.S
+++ b/libcpu/arm/lpc24xx/start_rvds.S
@@ -1489,7 +1489,7 @@ MEMMAP          EQU     0xE01FC040      ; Memory Mapping Control
 
                 IMPORT rt_interrupt_enter
                 IMPORT rt_interrupt_leave
-                IMPORT rt_thread_switch_interrput_flag
+                IMPORT rt_thread_switch_interrupt_flag
                 IMPORT rt_interrupt_from_thread
                 IMPORT rt_interrupt_to_thread
                 IMPORT rt_hw_trap_irq
@@ -1501,9 +1501,9 @@ IRQ_Handler     PROC
                 BL  rt_hw_trap_irq
                 BL  rt_interrupt_leave
 
-                ; if rt_thread_switch_interrput_flag set, jump to
+                ; if rt_thread_switch_interrupt_flag set, jump to
                 ; rt_hw_context_switch_interrupt_do and don't return
-                LDR r0, =rt_thread_switch_interrput_flag
+                LDR r0, =rt_thread_switch_interrupt_flag
                 LDR r1, [r0]
                 CMP r1, #1
                 BEQ rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/nuc1xx/context_rvds.S b/libcpu/arm/nuc1xx/context_rvds.S
index a2771d09454e14bbe62494031b13e1f729b504ca..0ecd8427d78c042680214f75dbf1fdba13dde164 100644
--- a/libcpu/arm/nuc1xx/context_rvds.S
+++ b/libcpu/arm/nuc1xx/context_rvds.S
@@ -27,7 +27,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
 	REQUIRE8
 	PRESERVE8
 
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
@@ -60,8 +60,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
 	EXPORT rt_hw_context_switch
 
-	; set rt_thread_switch_interrput_flag to 1
-	LDR 	r2, =rt_thread_switch_interrput_flag
+	; set rt_thread_switch_interrupt_flag to 1
+	LDR 	r2, =rt_thread_switch_interrupt_flag
 	LDR 	r3, [r2]
 	CMP 	r3, #1
 	BEQ 	_reswitch
@@ -92,12 +92,12 @@ rt_hw_pend_sv	PROC
 	CPSID   I
 
 	; get rt_thread_switch_interrupt_flag
-	LDR		r0, =rt_thread_switch_interrput_flag
+	LDR		r0, =rt_thread_switch_interrupt_flag
 	LDR		r1, [r0]
 	CMP		r1, #0x00
 	BEQ		pendsv_exit				; pendsv already handled
 
-	; clear rt_thread_switch_interrput_flag to 0
+	; clear rt_thread_switch_interrupt_flag to 0
 	MOVS	r1, #0x00
 	STR		r1, [r0]
 
@@ -146,7 +146,7 @@ rt_hw_context_switch_to    PROC
 	STR		r0, [r1]
 
 	; set interrupt flag to 1
-	LDR 	r1, =rt_thread_switch_interrput_flag
+	LDR 	r1, =rt_thread_switch_interrupt_flag
 	MOVS 	r0, #1
 	STR 	r0, [r1]
 
diff --git a/libcpu/arm/nuc1xx/interrupt.c b/libcpu/arm/nuc1xx/interrupt.c
index a1a3eb24416085c734f0bcfebfda978696bf12ee..ce43a7781a1b70f0b5cdde1f4d602246ff94086a 100644
--- a/libcpu/arm/nuc1xx/interrupt.c
+++ b/libcpu/arm/nuc1xx/interrupt.c
@@ -16,6 +16,6 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint8_t rt_thread_switch_interrput_flag;
+rt_uint8_t rt_thread_switch_interrupt_flag;
 
 /*@}*/
diff --git a/libcpu/arm/s3c24x0/context_gcc.S b/libcpu/arm/s3c24x0/context_gcc.S
index 80e9245698dcac749f2e949aa1e24063eb24a0a7..bc614aec137efce19d62b7eb934c0ece26dd7492 100644
--- a/libcpu/arm/s3c24x0/context_gcc.S
+++ b/libcpu/arm/s3c24x0/context_gcc.S
@@ -80,16 +80,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr r2, =rt_thread_switch_interrput_flag
+	ldr r2, =rt_thread_switch_interrupt_flag
 	ldr r3, [r2]
 	cmp r3, #1
 	beq _reswitch
-	mov r3, #1				@ set rt_thread_switch_interrput_flag to 1
+	mov r3, #1				@ set rt_thread_switch_interrupt_flag to 1
 	str r3, [r2]
 	ldr r2, =rt_interrupt_from_thread	@ set rt_interrupt_from_thread
 	str r0, [r2]
diff --git a/libcpu/arm/s3c24x0/context_rvds.S b/libcpu/arm/s3c24x0/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..e24fa62a3dd5dd1f46ed2c32255752e171173e46 100644
--- a/libcpu/arm/s3c24x0/context_rvds.S
+++ b/libcpu/arm/s3c24x0/context_rvds.S
@@ -84,17 +84,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/s3c24x0/interrupt.c b/libcpu/arm/s3c24x0/interrupt.c
index 8cbd6230b6679f28ebcaa5b6724fe473772b0b08..18cdbaa09f6128e5fa0ec5be61eb592151e693c5 100644
--- a/libcpu/arm/s3c24x0/interrupt.c
+++ b/libcpu/arm/s3c24x0/interrupt.c
@@ -22,7 +22,7 @@ extern rt_uint32_t rt_interrupt_nest;
 /* exception and interrupt handler table */
 rt_isr_handler_t isr_table[MAX_HANDLERS];
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /**
  * @addtogroup S3C24X0
@@ -70,7 +70,7 @@ void rt_hw_interrupt_init(void)
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/arm/s3c24x0/start_gcc.S b/libcpu/arm/s3c24x0/start_gcc.S
index c82b999640775ce30f4013f576265146aea3ed7b..72f516405333299a5e8d6b76ae779229c1661c59 100644
--- a/libcpu/arm/s3c24x0/start_gcc.S
+++ b/libcpu/arm/s3c24x0/start_gcc.S
@@ -291,7 +291,7 @@ vector_resv:
 
 .globl 		rt_interrupt_enter
 .globl 		rt_interrupt_leave
-.globl 		rt_thread_switch_interrput_flag
+.globl 		rt_thread_switch_interrupt_flag
 .globl 		rt_interrupt_from_thread
 .globl 		rt_interrupt_to_thread
 vector_irq:
@@ -300,8 +300,8 @@ vector_irq:
 	bl		rt_hw_trap_irq
 	bl		rt_interrupt_leave
 
-	/* if rt_thread_switch_interrput_flag set, jump to _interrupt_thread_switch and don't return */
-	ldr		r0, =rt_thread_switch_interrput_flag
+	/* if rt_thread_switch_interrupt_flag set, jump to _interrupt_thread_switch and don't return */
+	ldr		r0, =rt_thread_switch_interrupt_flag
 	ldr		r1, [r0]
 	cmp		r1, #1
 	beq		_interrupt_thread_switch
@@ -317,7 +317,7 @@ vector_fiq:
 	subs	pc,lr,#4
 
 _interrupt_thread_switch:
-	mov		r1,  #0					/* clear rt_thread_switch_interrput_flag*/
+	mov		r1,  #0					/* clear rt_thread_switch_interrupt_flag*/
 	str		r1,  [r0]
 
 	ldmfd	sp!, {r0-r12,lr}		/* reload saved registers			*/
diff --git a/libcpu/arm/s3c24x0/start_rvds.S b/libcpu/arm/s3c24x0/start_rvds.S
index 89fca25c39d0fdd3cc89eb0326cc786f97ea6a29..38872cd93b0ef7d7247eb23956a8c727e76d04ab 100644
--- a/libcpu/arm/s3c24x0/start_rvds.S
+++ b/libcpu/arm/s3c24x0/start_rvds.S
@@ -1097,7 +1097,7 @@ Reset_Handler
 
                 IMPORT rt_interrupt_enter
                 IMPORT rt_interrupt_leave
-                IMPORT rt_thread_switch_interrput_flag
+                IMPORT rt_thread_switch_interrupt_flag
                 IMPORT rt_interrupt_from_thread
                 IMPORT rt_interrupt_to_thread
                 IMPORT rt_hw_trap_irq
@@ -1109,9 +1109,9 @@ IRQ_Handler     PROC
                 BL  rt_hw_trap_irq
                 BL  rt_interrupt_leave
 
-                ; if rt_thread_switch_interrput_flag set, jump to
+                ; if rt_thread_switch_interrupt_flag set, jump to
                 ; rt_hw_context_switch_interrupt_do and don't return
-                LDR r0, =rt_thread_switch_interrput_flag
+                LDR r0, =rt_thread_switch_interrupt_flag
                 LDR r1, [r0]
                 CMP r1, #1
                 BEQ rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/s3c44b0/context_gcc.S b/libcpu/arm/s3c44b0/context_gcc.S
index 7b39e3252216c0915c7352bcd8b9b0a945da2bbe..bbdc3989e461d664238a652a7ba185d61bc73f00 100644
--- a/libcpu/arm/s3c44b0/context_gcc.S
+++ b/libcpu/arm/s3c44b0/context_gcc.S
@@ -80,16 +80,16 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-	ldr r2, =rt_thread_switch_interrput_flag
+	ldr r2, =rt_thread_switch_interrupt_flag
 	ldr r3, [r2]
 	cmp r3, #1
 	beq _reswitch
-	mov r3, #1				@ set rt_thread_switch_interrput_flag to 1
+	mov r3, #1				@ set rt_thread_switch_interrupt_flag to 1
 	str r3, [r2]
 	ldr r2, =rt_interrupt_from_thread	@ set rt_interrupt_from_thread
 	str r0, [r2]
diff --git a/libcpu/arm/s3c44b0/context_rvds.S b/libcpu/arm/s3c44b0/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..e24fa62a3dd5dd1f46ed2c32255752e171173e46 100644
--- a/libcpu/arm/s3c44b0/context_rvds.S
+++ b/libcpu/arm/s3c44b0/context_rvds.S
@@ -84,17 +84,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/s3c44b0/interrupt.c b/libcpu/arm/s3c44b0/interrupt.c
index 8051459712adf0554660be7a28aa2fdba5466b73..3fc4f8c5b0677e98e19eb1da1a53cca2e201a214 100644
--- a/libcpu/arm/s3c44b0/interrupt.c
+++ b/libcpu/arm/s3c44b0/interrupt.c
@@ -24,7 +24,7 @@ extern rt_uint32_t rt_interrupt_nest;
 /* exception and interrupt handler table */
 rt_isr_handler_t isr_table[MAX_HANDLERS];
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 unsigned char interrupt_bank0[256];
 unsigned char interrupt_bank1[256];
@@ -109,7 +109,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/arm/s3c44b0/start_gcc.S b/libcpu/arm/s3c44b0/start_gcc.S
index 4108fc2462b95da7364c95862b4a18e2be63ffe2..ff9398c0b76380bc36a8f4bd7908448f3db4184a 100644
--- a/libcpu/arm/s3c44b0/start_gcc.S
+++ b/libcpu/arm/s3c44b0/start_gcc.S
@@ -138,7 +138,7 @@ vector_resv: 	bl rt_hw_trap_resv
 
 .globl rt_interrupt_enter
 .globl rt_interrupt_leave
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 vector_irq:	
@@ -148,8 +148,8 @@ vector_irq:
 	bl	rt_hw_trap_irq
 	bl	rt_interrupt_leave
 
-	/* if rt_thread_switch_interrput_flag set, jump to _interrupt_thread_switch and don't return */
-	ldr	r0, =rt_thread_switch_interrput_flag
+	/* if rt_thread_switch_interrupt_flag set, jump to _interrupt_thread_switch and don't return */
+	ldr	r0, =rt_thread_switch_interrupt_flag
 	ldr	r1, [r0]
 	cmp	r1, #1
 	beq	_interrupt_thread_switch
@@ -165,7 +165,7 @@ vector_fiq:
 	subs pc,lr,#4
 
 _interrupt_thread_switch:
-	mov	r1, #0				@ clear rt_thread_switch_interrput_flag
+	mov	r1, #0				@ clear rt_thread_switch_interrupt_flag
 	str	r1, [r0]
 
 	ldmfd sp!, {r0-r12,lr}	@ reload saved registers
diff --git a/libcpu/arm/s3c44b0/start_rvds.S b/libcpu/arm/s3c44b0/start_rvds.S
index 3154bf37517fe0473059b99b9cd727fc1e8fd313..192120dff5d230c34ac400afd9ce4350331f57f8 100644
--- a/libcpu/arm/s3c44b0/start_rvds.S
+++ b/libcpu/arm/s3c44b0/start_rvds.S
@@ -980,7 +980,7 @@ Reset_Handler
 
 				IMPORT rt_interrupt_enter
 				IMPORT rt_interrupt_leave
-				IMPORT rt_thread_switch_interrput_flag
+				IMPORT rt_thread_switch_interrupt_flag
 				IMPORT rt_interrupt_from_thread
 				IMPORT rt_interrupt_to_thread
 				IMPORT rt_hw_trap_irq
@@ -992,9 +992,9 @@ IRQ_Handler		PROC
 				BL	rt_hw_trap_irq
 				BL	rt_interrupt_leave
 
-				; if rt_thread_switch_interrput_flag set, jump to
+				; if rt_thread_switch_interrupt_flag set, jump to
 				; rt_hw_context_switch_interrupt_do and don't return
-				LDR	r0, =rt_thread_switch_interrput_flag
+				LDR	r0, =rt_thread_switch_interrupt_flag
 				LDR	r1, [r0]
 				CMP	r1, #1
 				BEQ	rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/sep4020/context_rvds.S b/libcpu/arm/sep4020/context_rvds.S
index 82c5adc574304888b47f94c4007090505ced887f..e24fa62a3dd5dd1f46ed2c32255752e171173e46 100644
--- a/libcpu/arm/sep4020/context_rvds.S
+++ b/libcpu/arm/sep4020/context_rvds.S
@@ -84,17 +84,17 @@ rt_hw_context_switch_to	PROC
 ;/*
 ; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 ; */
-	IMPORT rt_thread_switch_interrput_flag
+	IMPORT rt_thread_switch_interrupt_flag
 	IMPORT rt_interrupt_from_thread
 	IMPORT rt_interrupt_to_thread
 
 rt_hw_context_switch_interrupt	PROC
 	EXPORT rt_hw_context_switch_interrupt
-	LDR r2, =rt_thread_switch_interrput_flag
+	LDR r2, =rt_thread_switch_interrupt_flag
 	LDR r3, [r2]
 	CMP r3, #1
 	BEQ _reswitch
-	MOV r3, #1							; set rt_thread_switch_interrput_flag to 1
+	MOV r3, #1							; set rt_thread_switch_interrupt_flag to 1
 	STR r3, [r2]
 	LDR r2, =rt_interrupt_from_thread	; set rt_interrupt_from_thread
 	STR r0, [r2]
diff --git a/libcpu/arm/sep4020/interrupt.c b/libcpu/arm/sep4020/interrupt.c
index f18bd2d6b33481f7e7feadb274131870af5b7890..7126e5acc270dcb1659df84be27cba4b92dce25e 100644
--- a/libcpu/arm/sep4020/interrupt.c
+++ b/libcpu/arm/sep4020/interrupt.c
@@ -22,7 +22,7 @@ extern rt_uint32_t rt_interrupt_nest;
 /* exception and interrupt handler table */
 rt_isr_handler_t isr_table[MAX_HANDLERS];
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /**
  * @addtogroup S3C24X0
@@ -75,7 +75,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/arm/sep4020/start_rvds.S b/libcpu/arm/sep4020/start_rvds.S
index 15865e1360321ec018179e6ec77aa5b1fbb66cc5..bb4d20595c5ee497fd2d5597ed6bfddfd161f198 100644
--- a/libcpu/arm/sep4020/start_rvds.S
+++ b/libcpu/arm/sep4020/start_rvds.S
@@ -290,7 +290,7 @@ Reset_Handler
 
                 IMPORT rt_interrupt_enter
                 IMPORT rt_interrupt_leave
-                IMPORT rt_thread_switch_interrput_flag
+                IMPORT rt_thread_switch_interrupt_flag
                 IMPORT rt_interrupt_from_thread
                 IMPORT rt_interrupt_to_thread
                 IMPORT rt_hw_trap_irq
@@ -302,9 +302,9 @@ IRQ_Handler     PROC
                 BL  rt_hw_trap_irq
                 BL  rt_interrupt_leave
 
-                ; if rt_thread_switch_interrput_flag set, jump to
+                ; if rt_thread_switch_interrupt_flag set, jump to
                 ; rt_hw_context_switch_interrupt_do and don't return
-                LDR r0, =rt_thread_switch_interrput_flag
+                LDR r0, =rt_thread_switch_interrupt_flag
                 LDR r1, [r0]
                 CMP r1, #1
                 BEQ rt_hw_context_switch_interrupt_do
diff --git a/libcpu/arm/stm32/context_gcc.S b/libcpu/arm/stm32/context_gcc.S
index ea7213d2ac7e07d89f9aa910f2f57fad416afcd3..189e7e6246f3b7c4ede117f1e1a6de8e95c6f25a 100644
--- a/libcpu/arm/stm32/context_gcc.S
+++ b/libcpu/arm/stm32/context_gcc.S
@@ -59,8 +59,8 @@ rt_hw_interrupt_enable:
 
 rt_hw_context_switch_interrupt:
 rt_hw_context_switch:
-    /* set rt_thread_switch_interrput_flag to 1 */
-    LDR     r2, =rt_thread_switch_interrput_flag
+    /* set rt_thread_switch_interrupt_flag to 1 */
+    LDR     r2, =rt_thread_switch_interrupt_flag
     LDR     r3, [r2]
     CMP     r3, #1
     BEQ     _reswitch
@@ -91,11 +91,11 @@ PendSV_Handler:
     CPSID   I
 
     /* get rt_thread_switch_interrupt_flag */
-    LDR r0, =rt_thread_switch_interrput_flag
+    LDR r0, =rt_thread_switch_interrupt_flag
     LDR r1, [r0]
     CBZ r1, pendsv_exit         /* pendsv already handled */
 
-    /* clear rt_thread_switch_interrput_flag to 0 */
+    /* clear rt_thread_switch_interrupt_flag to 0 */
     MOV r1, #0x00
     STR r1, [r0]
 
@@ -139,7 +139,7 @@ rt_hw_context_switch_to:
     STR r0, [r1]
 
     /* set interrupt flag to 1 */
-    LDR     r1, =rt_thread_switch_interrput_flag
+    LDR     r1, =rt_thread_switch_interrupt_flag
     MOV     r0, #1
     STR     r0, [r1]
 
diff --git a/libcpu/arm/stm32/context_iar.S b/libcpu/arm/stm32/context_iar.S
index f465dcc5a9c8b69e7fc8b9aae21afc7781405c73..c7d5c61d704a7fa3e51b042951b90327dbb30085 100644
--- a/libcpu/arm/stm32/context_iar.S
+++ b/libcpu/arm/stm32/context_iar.S
@@ -28,7 +28,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
     REQUIRE8
     PRESERVE8
 
-    IMPORT rt_thread_switch_interrput_flag
+    IMPORT rt_thread_switch_interrupt_flag
     IMPORT rt_interrupt_from_thread
     IMPORT rt_interrupt_to_thread
 
@@ -58,8 +58,8 @@ rt_hw_interrupt_enable:
     EXPORT rt_hw_context_switch
 rt_hw_context_switch_interrupt:
 rt_hw_context_switch:
-    ; set rt_thread_switch_interrput_flag to 1
-    LDR     r2, =rt_thread_switch_interrput_flag
+    ; set rt_thread_switch_interrupt_flag to 1
+    LDR     r2, =rt_thread_switch_interrupt_flag
     LDR     r3, [r2]
     CMP     r3, #1
     BEQ     _reswitch
@@ -89,11 +89,11 @@ PendSV_Handler:
     CPSID   I
 
     ; get rt_thread_switch_interrupt_flag
-    LDR     r0, =rt_thread_switch_interrput_flag
+    LDR     r0, =rt_thread_switch_interrupt_flag
     LDR     r1, [r0]
     CBZ     r1, pendsv_exit         ; pendsv already handled
 
-    ; clear rt_thread_switch_interrput_flag to 0
+    ; clear rt_thread_switch_interrupt_flag to 0
     MOV     r1, #0x00
     STR     r1, [r0]
 
@@ -136,7 +136,7 @@ rt_hw_context_switch_to:
     STR     r0, [r1]
 
     ; set interrupt flag to 1
-    LDR     r1, =rt_thread_switch_interrput_flag
+    LDR     r1, =rt_thread_switch_interrupt_flag
     MOV     r0, #1
     STR     r0, [r1]
 
diff --git a/libcpu/arm/stm32/context_rvds.S b/libcpu/arm/stm32/context_rvds.S
index 27d09817860decd6372acc9c88a7349bd6545b04..b38113239ecbe7eda0d18dfd588cfbb2f0927cb9 100644
--- a/libcpu/arm/stm32/context_rvds.S
+++ b/libcpu/arm/stm32/context_rvds.S
@@ -27,7 +27,7 @@ NVIC_PENDSVSET  EQU     0x10000000               ; value to trigger PendSV excep
     REQUIRE8
     PRESERVE8
 
-    IMPORT rt_thread_switch_interrput_flag
+    IMPORT rt_thread_switch_interrupt_flag
     IMPORT rt_interrupt_from_thread
     IMPORT rt_interrupt_to_thread
 
@@ -60,8 +60,8 @@ rt_hw_context_switch_interrupt
 rt_hw_context_switch    PROC
     EXPORT rt_hw_context_switch
 
-    ; set rt_thread_switch_interrput_flag to 1
-    LDR     r2, =rt_thread_switch_interrput_flag
+    ; set rt_thread_switch_interrupt_flag to 1
+    LDR     r2, =rt_thread_switch_interrupt_flag
     LDR     r3, [r2]
     CMP     r3, #1
     BEQ     _reswitch
@@ -92,11 +92,11 @@ PendSV_Handler   PROC
     CPSID   I
 
     ; get rt_thread_switch_interrupt_flag
-    LDR     r0, =rt_thread_switch_interrput_flag
+    LDR     r0, =rt_thread_switch_interrupt_flag
     LDR     r1, [r0]
     CBZ     r1, pendsv_exit         ; pendsv already handled
 
-    ; clear rt_thread_switch_interrput_flag to 0
+    ; clear rt_thread_switch_interrupt_flag to 0
     MOV     r1, #0x00
     STR     r1, [r0]
 
@@ -142,7 +142,7 @@ rt_hw_context_switch_to    PROC
     STR     r0, [r1]
 
     ; set interrupt flag to 1
-    LDR     r1, =rt_thread_switch_interrput_flag
+    LDR     r1, =rt_thread_switch_interrupt_flag
     MOV     r0, #1
     STR     r0, [r1]
 
diff --git a/libcpu/arm/stm32/cpuport.c b/libcpu/arm/stm32/cpuport.c
index b71a166ed8d3d83d6ad204789ae21eed0eced41f..02d342ef2533006e3565a01e60c19195e48dc9e4 100644
--- a/libcpu/arm/stm32/cpuport.c
+++ b/libcpu/arm/stm32/cpuport.c
@@ -16,7 +16,7 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 struct stack_contex
 {
diff --git a/libcpu/ia32/context.S b/libcpu/ia32/context.S
index 767a104b2bb7ecdbff7f31e686ecd53c7a69ce09..9f987e77a0e65c41349d82fc7594fe46283c4296 100644
--- a/libcpu/ia32/context.S
+++ b/libcpu/ia32/context.S
@@ -87,7 +87,7 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
  */
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 .globl rt_hw_context_switch_interrupt
@@ -97,12 +97,12 @@ rt_hw_context_switch_interrupt:
 	movl 0xc(%ebp), %eax
 	movl 0x8(%ebp), %ebx
 	
-	movl $rt_thread_switch_interrput_flag, %ecx
+	movl $rt_thread_switch_interrupt_flag, %ecx
 	movl (%ecx), %edx
 	cmp $0x1, %edx
 	jz _reswitch
 	
-	movl $0x1, %edx				/*set rt_thread_switch_interrput_flag to 1*/
+	movl $0x1, %edx				/*set rt_thread_switch_interrupt_flag to 1*/
 	movl %edx, (%ecx)
 	movl $rt_interrupt_from_thread, %edx	/*set rt_interrupt_from_thread*/
 	movl %ebx, (%edx)
diff --git a/libcpu/ia32/hdisr.S b/libcpu/ia32/hdisr.S
index b16311641d628f1d8ff309f6424f38fe24de1991..103b9031aa227baa0aeb522455c21f65d51199a0 100644
--- a/libcpu/ia32/hdisr.S
+++ b/libcpu/ia32/hdisr.S
@@ -60,7 +60,7 @@ HDINTERRUPTFNC(irq15, 15)
 .globl rt_interrupt_enter
 .globl rt_interrupt_leave
 .globl isr_table
-.globl rt_thread_switch_interrput_flag
+.globl rt_thread_switch_interrupt_flag
 .globl rt_interrupt_from_thread
 .globl rt_interrupt_to_thread
 
@@ -82,8 +82,8 @@ _hdinterrupts:
 	call *(%ebx)
 	call rt_interrupt_leave
 
-	/* if rt_thread_switch_interrput_flag set, jump to _interrupt_thread_switch and don't return */
-	movl $rt_thread_switch_interrput_flag, %eax
+	/* if rt_thread_switch_interrupt_flag set, jump to _interrupt_thread_switch and don't return */
+	movl $rt_thread_switch_interrupt_flag, %eax
 	movl (%eax), %ebx
 	cmp $0x1, %ebx
 	jz _interrupt_thread_switch
diff --git a/libcpu/ia32/interrupt.c b/libcpu/ia32/interrupt.c
index fe0bf07a5812f785e27149a36b1ea9f439ad7eec..91df04c0ce221ebff2cbe17aa2e5f4d16f53dce5 100644
--- a/libcpu/ia32/interrupt.c
+++ b/libcpu/ia32/interrupt.c
@@ -20,7 +20,7 @@ extern rt_uint32_t rt_interrupt_nest;
 extern void rt_hw_idt_init(void);
 
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 /* exception and interrupt handler table */
 rt_isr_handler_t isr_table[MAX_HANDLERS];
@@ -61,7 +61,7 @@ void rt_hw_pic_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 void rt_hw_interrupt_handle(int vector)
diff --git a/libcpu/mips/jz47xx/context_gcc.S b/libcpu/mips/jz47xx/context_gcc.S
index 00576d8f485fc8c6cd67db440288128b6b66b374..42b0d130332f78319131559caa73f214af541d2b 100644
--- a/libcpu/mips/jz47xx/context_gcc.S
+++ b/libcpu/mips/jz47xx/context_gcc.S
@@ -60,17 +60,17 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
  */
-    .globl rt_thread_switch_interrput_flag
+    .globl rt_thread_switch_interrupt_flag
     .globl rt_interrupt_from_thread
     .globl rt_interrupt_to_thread
     .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-    la      t0, rt_thread_switch_interrput_flag
+    la      t0, rt_thread_switch_interrupt_flag
     lw      t1, 0(t0)
     nop
     bnez    t1, _reswitch
     nop
-    li      t1, 0x01                       /* set rt_thread_switch_interrput_flag to 1 */
+    li      t1, 0x01                       /* set rt_thread_switch_interrupt_flag to 1 */
     sw      t1, 0(t0)
     la      t0, rt_interrupt_from_thread   /* set rt_interrupt_from_thread */
     sw      a0, 0(t0)
@@ -115,10 +115,10 @@ mips_irq_handle:
     move    sp, k0
 
     /*
-     * if rt_thread_switch_interrput_flag set, jump to
+     * if rt_thread_switch_interrupt_flag set, jump to
      * rt_hw_context_switch_interrupt_do and don't return
      */
-    la      k0, rt_thread_switch_interrput_flag
+    la      k0, rt_thread_switch_interrupt_flag
     lw      k1, 0(k0)
     beqz    k1, spurious_interrupt
     nop
diff --git a/libcpu/mips/jz47xx/interrupt.c b/libcpu/mips/jz47xx/interrupt.c
index d7aa0ea209c070c1703f2cffcc03c623f37775eb..78ba87c2e9ae0cfc0da0826ef615f1d4ad94583b 100644
--- a/libcpu/mips/jz47xx/interrupt.c
+++ b/libcpu/mips/jz47xx/interrupt.c
@@ -18,7 +18,7 @@
 
 extern rt_uint32_t rt_interrupt_nest;
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 static rt_isr_handler_t irq_handle_table[JZ47XX_MAX_INTR];
 
@@ -48,7 +48,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/mips/loongson/context_gcc.S b/libcpu/mips/loongson/context_gcc.S
index 1611f1cd86e2a2006ca398774668b6dc268411ca..65cab6e1473f66923097dc45793380d76da63d71 100644
--- a/libcpu/mips/loongson/context_gcc.S
+++ b/libcpu/mips/loongson/context_gcc.S
@@ -60,17 +60,17 @@ rt_hw_context_switch_to:
 /*
  * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
  */
-    .globl rt_thread_switch_interrput_flag
+    .globl rt_thread_switch_interrupt_flag
     .globl rt_interrupt_from_thread
     .globl rt_interrupt_to_thread
     .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-    la      t0, rt_thread_switch_interrput_flag
+    la      t0, rt_thread_switch_interrupt_flag
     lw      t1, 0(t0)
     nop
     bnez    t1, _reswitch
     nop
-    li      t1, 0x01                       /* set rt_thread_switch_interrput_flag to 1 */
+    li      t1, 0x01                       /* set rt_thread_switch_interrupt_flag to 1 */
     sw      t1, 0(t0)
     la      t0, rt_interrupt_from_thread   /* set rt_interrupt_from_thread */
     sw      a0, 0(t0)
@@ -110,10 +110,10 @@ mips_irq_handle:
     move    sp, k0
 
     /*
-     * if rt_thread_switch_interrput_flag set, jump to
+     * if rt_thread_switch_interrupt_flag set, jump to
      * rt_hw_context_switch_interrupt_do and don't return
      */
-    la      k0, rt_thread_switch_interrput_flag
+    la      k0, rt_thread_switch_interrupt_flag
     lw      k1, 0(k0)
     beqz    k1, spurious_interrupt
     nop
diff --git a/libcpu/mips/loongson/interrupt.c b/libcpu/mips/loongson/interrupt.c
index 2d354269aa079aa2e1f485073f9ecd23be802ed9..20cc2f8b9b614e165a582690182be0f2d200536a 100644
--- a/libcpu/mips/loongson/interrupt.c
+++ b/libcpu/mips/loongson/interrupt.c
@@ -18,7 +18,7 @@
 
 extern rt_uint32_t rt_interrupt_nest;
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 
 static rt_isr_handler_t irq_handle_table[MAX_INTR];
 void rt_interrupt_dispatch(void *ptreg);
@@ -50,7 +50,7 @@ void rt_hw_interrupt_init()
 	rt_interrupt_nest = 0;
 	rt_interrupt_from_thread = 0;
 	rt_interrupt_to_thread = 0;
-	rt_thread_switch_interrput_flag = 0;
+	rt_thread_switch_interrupt_flag = 0;
 }
 
 /**
diff --git a/libcpu/nios/nios_ii/context_gcc.S b/libcpu/nios/nios_ii/context_gcc.S
index a389db162d9aa6f341da3562235a305da0b5dc41..3ccaff3b20b5d271160f91d3da9f4f2a52ab3be9 100644
--- a/libcpu/nios/nios_ii/context_gcc.S
+++ b/libcpu/nios/nios_ii/context_gcc.S
@@ -85,9 +85,9 @@ rt_hw_context_switch_interrupt_do:
     /* *r4(from_thread->sp) = sp */
     stw sp, (r4)
 
-    /* clear rt_thread_switch_interrput_flag */
-    /* rt_thread_switch_interrput_flag = 0 */
-    stw zero,%gprel(rt_thread_switch_interrput_flag)(gp)
+    /* clear rt_thread_switch_interrupt_flag */
+    /* rt_thread_switch_interrupt_flag = 0 */
+    stw zero,%gprel(rt_thread_switch_interrupt_flag)(gp)
 
     /* load to thread sp */
     /* r4 = rt_interrupt_to_thread(&to_thread->sp) */
@@ -213,8 +213,8 @@ rt_hw_context_switch:
 .global rt_hw_context_switch_interrupt
 .type rt_hw_context_switch_interrupt, %function
 rt_hw_context_switch_interrupt:
-    /* if( rt_thread_switch_interrput_flag != 0 ) _from_thread_not_change */
-    ldw r2,%gprel(rt_thread_switch_interrput_flag)(gp)
+    /* if( rt_thread_switch_interrupt_flag != 0 ) _from_thread_not_change */
+    ldw r2,%gprel(rt_thread_switch_interrupt_flag)(gp)
     bne r2,zero,_from_thread_not_change
 
 _from_thread_change:
@@ -222,9 +222,9 @@ _from_thread_change:
     addi ea,ea,-4
     stw ea,%gprel(rt_current_thread_entry)(gp)
 
-    /* set rt_thread_switch_interrput_flag to 1 */
+    /* set rt_thread_switch_interrupt_flag to 1 */
     movi r2, 1
-    stw r2,%gprel(rt_thread_switch_interrput_flag)(gp)
+    stw r2,%gprel(rt_thread_switch_interrupt_flag)(gp)
 
     /* update rt_interrupt_from_thread */
     stw r4,%gprel(rt_interrupt_from_thread)(gp)
diff --git a/libcpu/nios/nios_ii/interrupt.c b/libcpu/nios/nios_ii/interrupt.c
index 18c4abd6d8f83e1dcdcfaa88e84e46de63e65db0..15c574901bec163f9686e71dbb101e9a511b2019 100644
--- a/libcpu/nios/nios_ii/interrupt.c
+++ b/libcpu/nios/nios_ii/interrupt.c
@@ -16,7 +16,7 @@
 
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
+rt_uint32_t rt_thread_switch_interrupt_flag;
 rt_uint32_t rt_current_thread_entry;
 
 /*@}*/
diff --git a/libcpu/nios/nios_ii/vector.S b/libcpu/nios/nios_ii/vector.S
index ab700aeee61f90c7e77bead591dae2ede7d88711..f8d43425b87ab9ea6b161ec10c7571c8987b0ca9 100644
--- a/libcpu/nios/nios_ii/vector.S
+++ b/libcpu/nios/nios_ii/vector.S
@@ -10,13 +10,13 @@
         /* get exception back */
         ldw ea, 72(sp)
 
-        /* if(rt_thread_switch_interrput_flag == 0) goto no_need_context */
-        ldw r4,%gprel(rt_thread_switch_interrput_flag)(gp)
+        /* if(rt_thread_switch_interrupt_flag == 0) goto no_need_context */
+        ldw r4,%gprel(rt_thread_switch_interrupt_flag)(gp)
         beq r4,zero,no_need_context
 
 need_context:
         movia ea, rt_hw_context_switch_interrupt_do
-        /* disable interrput */
+        /* disable interrupt */
         mov r5, zero
 
 no_need_context: