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[2/3] powerpc: Document register clobbering in EXCEPTION_COMMON()

Message ID 1405422938-27608-2-git-send-email-mpe@ellerman.id.au (mailing list archive)
State Accepted
Headers show

Commit Message

Michael Ellerman July 15, 2014, 11:15 a.m. UTC 
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/include/asm/exception-64s.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 8f35cd7d59cc..066c15cd2837 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -532,6 +532,7 @@  END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 	.globl label##_common;					\
 label##_common:							\
 	EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);		\
+	/* Volatile regs are potentially clobbered here */	\
 	additions;						\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
 	bl	hdlr;						\