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| author | Andi Kleen <andi@firstfloor.org> | 2010-06-18 23:09:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:26:37 -0700 |
| commit | 342b5e0e33c586b71c72bc1f60eb2fc7ed359f97 (patch) | |
| tree | 430f4a657dd328e6e7fda43149c35b23ba6135f2 /arch | |
| parent | c31d368130d2cdfb78096025b503b89e3e49c453 (diff) | |
| download | lwn-342b5e0e33c586b71c72bc1f60eb2fc7ed359f97.tar.gz lwn-342b5e0e33c586b71c72bc1f60eb2fc7ed359f97.zip | |
x86: Fix vsyscall on gcc 4.5 with -Os
commit 124482935fb7fb9303c8a8ab930149c6a93d9910 upstream.
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@linux.intel.com>
LKML-Reference: <20100618210859.GA10913@basil.fritz.box>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | 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 e04740f7a0bb..2a19418940bc 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); |