linux-kernel - [PATCH 04/11] powerpc/32: add CLR_MSR_WE() in EXCEPTION_PROLOG in head

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Message-Id: <261649c2a789e3321c886f1e6f8741f8a8cdad86.1548673552.git.christophe.leroy@c-s.fr>
Date:   Mon, 28 Jan 2019 11:11:19 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 04/11] powerpc/32: add CLR_MSR_WE() in EXCEPTION_PROLOG in
 head_32.h

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@....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@ha; /* exception frame marker */ \
 	addi	r10,r10,STACK_FRAME_REGS_MARKER@l; \
-- 
2.13.3