x86: Document rdmsr_safe restrictions
authorBorislav Petkov <borislav.petkov@amd.com>
Mon, 5 Dec 2011 13:28:37 +0000 (14:28 +0100)
committerBorislav Petkov <borislav.petkov@amd.com>
Mon, 5 Dec 2011 13:28:37 +0000 (14:28 +0100)
Recently, I got bitten by using rdmsr_safe too early in the boot
process. Document its shortcomings for future reference.

Link: http://lkml.kernel.org/r/4ED5B70F.606@lwfinger.net
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

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