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

This reverts commit ce37defc0f
"x86: Document rdmsr_safe restrictions", as these restrictions no longer apply.

Reported-by: Borislav Petkov <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>

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;						\