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crypto: xor - Check for osxsave as well as avx in crypto/xor 

This affects xen pv guests with sufficiently old versions of xen and
sufficiently new hardware.  On such a system, a guest with a btrfs
root won't even boot.

Signed-off-by: John Haxby <john.haxby@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
John Haxby 2013-08-14 16:23:18 +01:00 committed by Herbert Xu
parent 452ec0498f
commit edb6f29464
1 changed files with 2 additions and 2 deletions
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4
arch/x86/include/asm/xor_avx.h
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@ -167,12 +167,12 @@ static struct xor_block_template xor_block_avx = {
#define AVX_XOR_SPEED \
do { \
if (cpu_has_avx) \
if (cpu_has_avx && cpu_has_osxsave) \
xor_speed(&xor_block_avx); \
} while (0)
#define AVX_SELECT(FASTEST) \
(cpu_has_avx ? &xor_block_avx : FASTEST)
(cpu_has_avx && cpu_has_osxsave ? &xor_block_avx : FASTEST)
#else