[PATCH v1 14/15] powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_to_user() on ppc32

Christophe Leroy
2021-02-25T18:00:15Z

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@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 b3bd1fb42242..e831653db51a 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -371,9 +371,9 @@ 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