[PATCH] x86: Fix vsyscall on gcc 4.5 with -Os
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From: Andi Kleen on 18 Jun 2010 17:10 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(a)linux.intel.com> --- arch/x86/include/asm/system.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.34-ak/arch/x86/include/asm/system.h =================================================================== --- linux-2.6.34-ak.orig/arch/x86/include/asm/system.h +++ linux-2.6.34-ak/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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |