Commit c1cc1570 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
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powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_from_user() on ppc32 



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: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/308e65d9237a14e8c0e3b22919fcf0b5e5592608.1616151715.git.christophe.leroy@csgroup.eu
parent fb05121f

arch/powerpc/include/asm/uaccess.h

+3 −3
Original line number Diff line number Diff line
@@ -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;								\

	}										\