x86, doc: Revert "x86: Document rdmsr_safe restrictions"

This reverts commit ce37defc0f6673f5ca2c92ed5cfcaf290ae7dd16
"x86: Document rdmsr_safe restrictions", as these restrictions no longer apply.

Reported-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/20120419171609.GH3221@aftab.osrc.amd.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 95203d40ffdde69d014c986453905280b49ee9e5..084ef95274cd78ceb51b1ea7a208a7a5e486199a 100644 (file)
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -169,14 +169,7 @@ static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high)
        return native_write_msr_safe(msr, low, high);
 }
 
-/*
- * 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.
- */
+/* rdmsr with exception handling */
 #define rdmsr_safe(msr, p1, p2)                                        \
 ({                                                             \
        int __err;                                              \