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)
commitce37defc0f6673f5ca2c92ed5cfcaf290ae7dd16
treee662613f6ef4629ec8504502a87079c9b93117da
parentbd399063976c6c7a09beb4730ed1d93cadbcc739
x86: Document rdmsr_safe restrictions

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>
arch/x86/include/asm/msr.h