[PATCH 04/11] powerpc/32: add CLR_MSR_WE() in EXCEPTION_PROLOG in head_32.h

[Christophe Leroy]

Add CLR_MSR_WE() macro to allow 40x to clear
that bit from the register containing msr value.

This is the only difference between common EXCEPTION_PROLOG
and 40x one. This patch will allow 40x to use the common one.

Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
---
 arch/powerpc/kernel/head_32.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 9e6fb9d468f0..643dd8d34aac 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -8,6 +8,10 @@
 #define SET_AND_STORE_MSR_RI(reg)
 #endif
 
+#ifndef CLR_MSR_WE
+#define CLR_MSR_WE(reg)
+#endif
+
 /*
  * Exception entry code.  This code runs with address translation
  * turned off, i.e. using physical addresses.
@@ -49,6 +53,7 @@
 	stw	r1,0(r11);	\
 	tovirt(r1,r11);			/* set new kernel sp */	\
 	SET_AND_STORE_MSR_RI(r10);	/* can take exceptions */ \
+	CLR_MSR_WE(r9);		\
 	stw	r0,GPR0(r11);	\
 	lis	r10,STACK_FRAME_REGS_MARKER at ha; /* exception frame marker */ \
 	addi	r10,r10,STACK_FRAME_REGS_MARKER at l; \
-- 
2.13.3