From: Borislav Petkov Date: Mon, 5 Dec 2011 13:28:37 +0000 (+0100) Subject: x86: Document rdmsr_safe restrictions X-Git-Tag: v3.2-rc5~41^2~7^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ce37defc0f6673f5ca2c92ed5cfcaf290ae7dd16;p=profile%2Fivi%2Fkernel-x86-ivi.git 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 --- diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index 084ef95..95203d4 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -169,7 +169,14 @@ static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high) return native_write_msr_safe(msr, low, high); } -/* rdmsr with exception handling */ +/* + * rdmsr with exception handling. + * + * Please note that the exception handling works only after we've + * switched to the "smart" #GP handler in trap_init() which knows about + * exception tables - using this macro earlier than that causes machine + * hangs on boxes which do not implement the @msr in the first argument. + */ #define rdmsr_safe(msr, p1, p2) \ ({ \ int __err; \