x86, smap: Add a header file with macros for STAC/CLAC

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The STAC/CLAC instructions are only available with SMAP, but on the
other hand they aren't needed if SMAP is not available, or before we
start to run userspace, so construct them as alternatives which start
out as noops and are enabled by the alternatives mechanism.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-7-git-send-email-hpa@linux.intel.com

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H. Peter Anvin 2012-09-21 12:43:10 -07:00

parent 76f30759f6

commit 51ae4a2d77

2 changed files with 102 additions and 0 deletions

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11

arch/x86/Kconfig

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91

arch/x86/include/asm/smap.h

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