ARM: use ldr_l to replace ldr instruction for the symbol jump

hulk inclusion
category: bugfix
bugzilla: 185737 https://gitee.com/openeuler/kernel/issues/I4DDEL

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ARM supports position independent code sequences that produce symbol
references with a greater reach than the ordinary adr/ldr instructions,
pseudo-instruction ldr_l is used to solve the symbol references problem,
so we should use ldr_l to replace ldr instrutction when kaslr is enabled.
Signed-off-by: NCui GaoSheng <cuigaosheng1@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm/mm/proc-v7.S

@@ -112,10 +112,8 @@ ENTRY(cpu_v7_hvc_switch_mm)
 ENDPROC(cpu_v7_hvc_switch_mm)
 #endif
 
-.globl nospectre_v2
 ENTRY(cpu_v7_iciallu_switch_mm)
-	adr r3, 3f
-	ldr r3, [r3]
+	ldr_l r3, nospectre_v2
 	cmp r3, #1
 	beq 1f
 	mov	r3, #0
@@ -124,8 +122,7 @@ ENTRY(cpu_v7_iciallu_switch_mm)
 	b	cpu_v7_switch_mm
 ENDPROC(cpu_v7_iciallu_switch_mm)
 ENTRY(cpu_v7_bpiall_switch_mm)
-	adr r3, 3f
-	ldr r3, [r3]
+	ldr_l r3, nospectre_v2
 	cmp r3, #1
 	beq 1f
 	mov	r3, #0
@@ -134,9 +131,6 @@ ENTRY(cpu_v7_bpiall_switch_mm)
 	b	cpu_v7_switch_mm
 ENDPROC(cpu_v7_bpiall_switch_mm)
 
-	.align
-3:	.long nospectre_v2
-
 	string	cpu_v7_name, "ARMv7 Processor"
 	.align