[PATCH v1 1/8] powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_to_user() on ppc32

Christophe Leroy christophe.leroy at csgroup.eu
Thu Mar 11 04:57:00 AEDT 2021


ppc32 has an efficiant 64 bits __put_user(), so also use it in
order to unroll loops more.

Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
---
 arch/powerpc/include/asm/uaccess.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 78e2a3990eab..2c09cff205ef 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -494,9 +494,9 @@ do {									\
 	size_t _len = (l);						\
 	int _i;								\
 									\
-	for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long))		\
-		unsafe_put_user(*(long*)(_src + _i), (long __user *)(_dst + _i), e); \
-	if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) {			\
+	for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64))	\
+		unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \
+	if (_len & 4) {							\
 		unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
 		_i += 4;						\
 	}								\
-- 
2.25.0



More information about the Linuxppc-dev mailing list