]> git.baikalelectronics.ru Git - kernel.git/commit
x86, avx: don't use avx instructions with "noxsave" boot param
authorSuresh Siddha <suresh.b.siddha@intel.com>
Tue, 31 Jul 2012 17:29:14 +0000 (10:29 -0700)
committerH. Peter Anvin <hpa@zytor.com>
Wed, 8 Aug 2012 20:41:42 +0000 (13:41 -0700)
commit39ecfc0cca17bb4610b4d2ac2e694ea0bfe83dab
tree0f9a7ab2e75aa1be2081a1241d6bd6ff96e6963f
parentab2b00cb12f57f7000a89264f5942b465febf174
x86, avx: don't use avx instructions with "noxsave" boot param

Clear AVX, AVX2 features along with clearing XSAVE feature bits,
as part of the parsing "noxsave" parameter.

Fixes the kernel boot panic with "noxsave" boot parameter.

We could have checked cpu_has_osxsave along with cpu_has_avx etc, but Peter
mentioned clearing the feature bits will be better for uses like
static_cpu_has() etc.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1343755754.2041.2.camel@sbsiddha-desk.sc.intel.com
Cc: <stable@vger.kernel.org> # v3.5
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
arch/x86/kernel/cpu/common.c