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[PATCH] i386: Replace broken serialize_cpu in microcode driver with correct sync_core

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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>
This commit is contained in:
Andi Kleen
2006-01-11 22:45:27 +01:00
committed by Linus Torvalds
parent c818a18146
commit 487472bc01
2 changed files with 6 additions and 4 deletions
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6
include/asm-i386/processor.h
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@@ -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,