linux-kernel - [tip:x86/urgent] x86: Fix vsyscall on gcc 4.5 with -Os

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Date:	Fri, 18 Jun 2010 22:15:44 GMT
From:	tip-bot for Andi Kleen <andi@...stfloor.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	andi@...stfloor.org, stable@...nel.org, ak@...ux.intel.com,
	tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x86: Fix vsyscall on gcc 4.5 with -Os

Commit-ID:  124482935fb7fb9303c8a8ab930149c6a93d9910
Gitweb:     http://git.kernel.org/tip/124482935fb7fb9303c8a8ab930149c6a93d9910
Author:     Andi Kleen <andi@...stfloor.org>
AuthorDate: Fri, 18 Jun 2010 23:09:00 +0200
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 18 Jun 2010 14:16:31 -0700

x86: Fix vsyscall on gcc 4.5 with -Os

This fixes the -Os breaks with gcc 4.5 bug.  rdtsc_barrier needs to be
force inlined, otherwise user space will jump into kernel space and
kill init.

This also addresses http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129
I believe.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
LKML-Reference: <20100618210859.GA10913@...il.fritz.box>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Cc: <stable@...nel.org>
---
 arch/x86/include/asm/system.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index b8fe48e..e7f4d33 100644
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -451,7 +451,7 @@ void stop_this_cpu(void *dummy);
  *
  * (Could use an alternative three way for this if there was one.)
  */
-static inline void rdtsc_barrier(void)
+static __always_inline void rdtsc_barrier(void)
 {
 	alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
 	alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
--
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