Merge tag 'arc-4.4-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC fixes from Vineet Gupta:
 - Fix for perf callgraph unwinding causing RCU stalls
 - Fix to enable Linux to run on non-default Interrupt priority 0
 - Removal of pointless SYNC from __switch_to()

* tag 'arc-4.4-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: dw2 unwind: Remove falllback linear search thru FDE entries
  ARC: remove SYNC from __switch_to()
  ARCv2: Use the default irq priority for idle sleep
  ARC: Abstract out ISA specific SLEEP args
  ARC: comments update
  ARC: switch to arc-linux- CROSS_COMPILE prefix across all configs

arch/arc/configs/axs101_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y

arch/arc/configs/axs103_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y

arch/arc/configs/axs103_smp_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y

arch/arc/configs/nsim_hs_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set

arch/arc/configs/nsim_hs_smp_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set

arch/arc/configs/nsimosci_hs_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set

arch/arc/configs/nsimosci_hs_smp_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y

arch/arc/configs/vdk_hs38_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_CROSS_MEMORY_ATTACH is not set

arch/arc/configs/vdk_hs38_smp_defconfig

-CONFIG_CROSS_COMPILE="arc-linux-uclibc-"
+CONFIG_CROSS_COMPILE="arc-linux-"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_CROSS_MEMORY_ATTACH is not set

arch/arc/include/asm/irqflags-arcv2.h

@@ -37,6 +37,9 @@
 #define ISA_INIT_STATUS_BITS	(STATUS_IE_MASK | STATUS_AD_MASK | \
 					(ARCV2_IRQ_DEF_PRIO << 1))
 
+/* SLEEP needs default irq priority (<=) which can interrupt the doze */
+#define ISA_SLEEP_ARG		(0x10 | ARCV2_IRQ_DEF_PRIO)
+
 #ifndef __ASSEMBLY__
 
 /*

arch/arc/include/asm/irqflags-compact.h

@@ -43,6 +43,8 @@
 
 #define ISA_INIT_STATUS_BITS	STATUS_IE_MASK
 
+#define ISA_SLEEP_ARG		0x3
+
 #ifndef __ASSEMBLY__
 
 /******************************************************************

arch/arc/kernel/ctx_sw.c

@@ -58,8 +58,6 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
 		"st      sp, [r24]       \n\t"
 #endif
 
-		"sync   \n\t"
-
 		/*
 		 * setup _current_task with incoming tsk.
 		 * optionally, set r25 to that as well

arch/arc/kernel/ctx_sw_asm.S

@@ -44,9 +44,6 @@ __switch_to:
 	* don't need to do anything special to return it
 	*/
 
-	/* hardware memory barrier */
-	sync
-
 	/*
 	 * switch to new task, contained in r1
 	 * Temp reg r3 is required to get the ptr to store val

arch/arc/kernel/process.c

@@ -44,11 +44,10 @@ SYSCALL_DEFINE0(arc_gettls)
 void arch_cpu_idle(void)
 {
 	/* sleep, but enable all interrupts before committing */
-	if (is_isa_arcompact()) {
-		__asm__("sleep 0x3");
-	} else {
-		__asm__("sleep 0x10");
-	}
+	__asm__ __volatile__(
+		"sleep %0	\n"
+		:
+		:"I"(ISA_SLEEP_ARG)); /* can't be "r" has to be embedded const */
 }
 
 asmlinkage void ret_from_fork(void);

arch/arc/kernel/unwind.c

@@ -986,42 +986,13 @@ int arc_unwind(struct unwind_frame_info *frame)
 							    (const u8 *)(fde +
 									 1) +
 							    *fde, ptrType);
-				if (pc >= endLoc)
+				if (pc >= endLoc) {
 					fde = NULL;
-			} else
-				fde = NULL;
-		}
-		if (fde == NULL) {
-			for (fde = table->address, tableSize = table->size;
-			     cie = NULL, tableSize > sizeof(*fde)
-			     && tableSize - sizeof(*fde) >= *fde;
-			     tableSize -= sizeof(*fde) + *fde,
-			     fde += 1 + *fde / sizeof(*fde)) {
-				cie = cie_for_fde(fde, table);
-				if (cie == &bad_cie) {
 					cie = NULL;
-					break;
 				}
-				if (cie == NULL
-				    || cie == &not_fde
-				    || (ptrType = fde_pointer_type(cie)) < 0)
-					continue;
-				ptr = (const u8 *)(fde + 2);
-				startLoc = read_pointer(&ptr,
-							(const u8 *)(fde + 1) +
-							*fde, ptrType);
-				if (!startLoc)
-					continue;
-				if (!(ptrType & DW_EH_PE_indirect))
-					ptrType &=
-					    DW_EH_PE_FORM | DW_EH_PE_signed;
-				endLoc =
-				    startLoc + read_pointer(&ptr,
-							    (const u8 *)(fde +
-									 1) +
-							    *fde, ptrType);
-				if (pc >= startLoc && pc < endLoc)
-					break;
+			} else {
+				fde = NULL;
+				cie = NULL;
 			}
 		}
 	}

arch/arc/mm/tlb.c

@@ -619,10 +619,10 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned,
 
 		int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
 		if (dirty) {
-			/* wback + inv dcache lines */
+			/* wback + inv dcache lines (K-mapping) */
 			__flush_dcache_page(paddr, paddr);
 
-			/* invalidate any existing icache lines */
+			/* invalidate any existing icache lines (U-mapping) */
 			if (vma->vm_flags & VM_EXEC)
 				__inv_icache_page(paddr, vaddr);
 		}