linux-kernel - [PATCH v3 2/2] powerpc/uaccess: Add pre-update addressing to __get_user_asm() and __put_user

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Date:   Wed, 12 Aug 2020 12:25:17 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
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 v3 2/2] powerpc/uaccess: Add pre-update addressing to
 __get_user_asm() and __put_user_asm()

Enable pre-update addressing mode in __get_user_asm() and __put_user_asm()

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v3: new, splited out from patch 1.
---
 arch/powerpc/include/asm/uaccess.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index c546fb36043d..eadb25f4cc9f 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -159,7 +159,7 @@ extern long __put_user_bad(void);
  */
 #define __put_user_asm(x, addr, err, op)			\
 	__asm__ __volatile__(					\
-		"1:	" op "%X2 %1,%2	# put_user\n"		\
+		"1:	" op "%U2%X2 %1,%2	# put_user\n"	\
 		"2:\n"						\
 		".section .fixup,\"ax\"\n"			\
 		"3:	li %0,%3\n"				\
@@ -167,7 +167,7 @@ extern long __put_user_bad(void);
 		".previous\n"					\
 		EX_TABLE(1b, 3b)				\
 		: "=r" (err)					\
-		: "r" (x), "m" (*addr), "i" (-EFAULT), "0" (err))
+		: "r" (x), "m<>" (*addr), "i" (-EFAULT), "0" (err))
 
 #ifdef __powerpc64__
 #define __put_user_asm2(x, ptr, retval)				\
@@ -317,7 +317,7 @@ extern long __get_user_bad(void);
 
 #define __get_user_asm(x, addr, err, op)		\
 	__asm__ __volatile__(				\
-		"1:	"op"%X2 %1, %2	# get_user\n"	\
+		"1:	"op"%U2%X2 %1, %2	# get_user\n"	\
 		"2:\n"					\
 		".section .fixup,\"ax\"\n"		\
 		"3:	li %0,%3\n"			\
@@ -326,7 +326,7 @@ extern long __get_user_bad(void);
 		".previous\n"				\
 		EX_TABLE(1b, 3b)			\
 		: "=r" (err), "=r" (x)			\
-		: "m" (*addr), "i" (-EFAULT), "0" (err))
+		: "m<>" (*addr), "i" (-EFAULT), "0" (err))
 
 #ifdef __powerpc64__
 #define __get_user_asm2(x, addr, err)			\
-- 
2.25.0