Messages in this thread Patch in this message | | | Subject | [patch] x86, avx: don't use avx instructions with "noxsave" boot param | From | Suresh Siddha <> | Date | Mon, 30 Jul 2012 15:46:15 -0700 |
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Check the kernel has indeed enabled xsave before using AVX instructions.
Fixes the kernel boot panic with "noxsave" boot parameter.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> --- arch/x86/include/asm/xor_avx.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/xor_avx.h b/arch/x86/include/asm/xor_avx.h index 2510d35..77987cd 100644 --- a/arch/x86/include/asm/xor_avx.h +++ b/arch/x86/include/asm/xor_avx.h @@ -197,12 +197,12 @@ 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
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