lkml.org 
[lkml]   [2021]   [Mar]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 02/10] powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_from_user() on ppc32
Date
Similarly to commit 5cf773fc8f37 ("powerpc/uaccess: Also perform
64 bits copies in unsafe_copy_to_user() on ppc32")

ppc32 has an efficiant 64 bits unsafe_get_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 77d837b16e4d..a4e791bcd3fe 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -432,9 +432,9 @@ do { \
size_t _len = (l); \
int _i; \
\
- for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long)) \
- unsafe_get_user(*(long *)(_dst + _i), (long __user *)(_src + _i), e); \
- if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) { \
+ for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \
+ unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \
+ if (_len & 4) { \
unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \
_i += 4; \
} \
--
2.25.0
\
 
 \ /
  Last update: 2021-03-19 12:08    [W:0.139 / U:0.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site