diff options
| author |   Andi Kleen <ak@suse.de> | 2006-01-11 22:45:27 +0100 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:04:58 -0800 |
| commit | 487472bc01fab0625996aad37836aad931e4eda9 (patch) | |
| tree | ede143ee4c756413b396911b3702068283b052f2 /include/asm-i386 | |
| parent | [PATCH] x86_64: On Intel CPUs don't do an additional CPU sync before RDTSC (diff) | |
| download | linux-dev-487472bc01fab0625996aad37836aad931e4eda9.tar.xz linux-dev-487472bc01fab0625996aad37836aad931e4eda9.zip | |
[PATCH] i386: Replace broken serialize_cpu in microcode driver with correct sync_core
Passing random input values in eax to cpuid is not a good idea
because the CPU will GPF for unknown ones.
Use the correct x86-64 version that exists for a longer time too.
This also adds a memory barrier to prevent the optimizer from
reordering.
Cc: tigran@veritas.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386')
| -rw-r--r-- | include/asm-i386/processor.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index 53461f42b663..13ecf66b098c 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -281,9 +281,11 @@ static inline void clear_in_cr4 (unsigned long mask) outb((data), 0x23); \ } while (0) -static inline void serialize_cpu(void) +/* Stop speculative execution */ +static inline void sync_core(void) { - __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx"); + int tmp; + asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory"); } static inline void __monitor(const void *eax, unsigned long ecx, |