linux-kernel - [tip:x86/extable] x86, doc: Revert "x86: Document rdmsr

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Message-ID: <tip-060feb650010c261fcfbae9de9348b46cedcd3cd@git.kernel.org>
Date:	Thu, 19 Apr 2012 17:29:45 -0700
From:	"tip-bot for H. Peter Anvin" <hpa@...ux.intel.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, hpa@...ux.intel.com, borislav.petkov@....com
Subject: [tip:x86/extable] x86, doc: Revert "x86:
  Document rdmsr_safe restrictions"

Commit-ID:  060feb650010c261fcfbae9de9348b46cedcd3cd
Gitweb:     http://git.kernel.org/tip/060feb650010c261fcfbae9de9348b46cedcd3cd
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Thu, 19 Apr 2012 17:07:34 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 19 Apr 2012 17:07:34 -0700

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@....com>
Link: http://lkml.kernel.org/r/20120419171609.GH3221@aftab.osrc.amd.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/include/asm/msr.h |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 95203d4..084ef95 100644
--- 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;						\
--
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