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powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_from_user() on ppc32

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/308e65d9237a14e8c0e3b22919fcf0b5e5592608.1616151715.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-19 11:06:51 +00:00 committed by Michael Ellerman
parent fb05121fd6
commit c1cc1570bc
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/include/asm/uaccess.h
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@ -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; \
} \