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[7/9] arm64: entry: save the x0 back into the stack before disabling the interrupt

Message ID 1464576750-25160-8-git-send-email-shijie.huang@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Huang Shijie May 30, 2016, 2:52 a.m. UTC 
We will add the hardirq flags trace code in the disable_irq, the trace
code may changes the x0, so save the x0 back into the stack before
disabling the interrupt,

This patch makes preparation for the later patch.

Signed-off-by: Huang Shijie <shijie.huang@arm.com>
---
 arch/arm64/kernel/entry.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 63bf7ad..7005789 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -672,8 +672,8 @@  ENDPROC(cpu_switch_to)
  * and this includes saving x0 back into the kernel stack.
  */
 ret_fast_syscall:
-	disable_irq				// disable interrupts
 	str	x0, [sp, #S_X0]			// returned x0
+	disable_irq				// disable interrupts
 	ldr	x1, [tsk, #TI_FLAGS]		// re-check for syscall tracing
 	and	x2, x1, #_TIF_SYSCALL_WORK
 	cbnz	x2, ret_fast_syscall_trace