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45426b3c GKH |
1 | From 124482935fb7fb9303c8a8ab930149c6a93d9910 Mon Sep 17 00:00:00 2001 |
2 | From: Andi Kleen <andi@firstfloor.org> | |
3 | Date: Fri, 18 Jun 2010 23:09:00 +0200 | |
4 | Subject: x86: Fix vsyscall on gcc 4.5 with -Os | |
5 | ||
6 | From: Andi Kleen <andi@firstfloor.org> | |
7 | ||
8 | commit 124482935fb7fb9303c8a8ab930149c6a93d9910 upstream. | |
9 | ||
10 | This fixes the -Os breaks with gcc 4.5 bug. rdtsc_barrier needs to be | |
11 | force inlined, otherwise user space will jump into kernel space and | |
12 | kill init. | |
13 | ||
14 | This also addresses http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129 | |
15 | I believe. | |
16 | ||
17 | Signed-off-by: Andi Kleen <ak@linux.intel.com> | |
18 | LKML-Reference: <20100618210859.GA10913@basil.fritz.box> | |
19 | Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> | |
20 | Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> | |
21 | ||
22 | --- | |
23 | arch/x86/include/asm/system.h | 2 +- | |
24 | 1 file changed, 1 insertion(+), 1 deletion(-) | |
25 | ||
26 | --- a/arch/x86/include/asm/system.h | |
27 | +++ b/arch/x86/include/asm/system.h | |
28 | @@ -449,7 +449,7 @@ void stop_this_cpu(void *dummy); | |
29 | * | |
30 | * (Could use an alternative three way for this if there was one.) | |
31 | */ | |
32 | -static inline void rdtsc_barrier(void) | |
33 | +static __always_inline void rdtsc_barrier(void) | |
34 | { | |
35 | alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC); | |
36 | alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC); |