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x86: clflush_page_range needs mfence

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clflush is an unordered operation with respect to other memory
traffic, including other CLFLUSH instructions. This needs proper
fencing with mfence.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:34:08 +01:00 committed by Ingo Molnar
parent af1e6844d6
commit cd8ddf1a28
1 changed files with 12 additions and 0 deletions
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12
arch/x86/mm/pageattr.c
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@ -25,12 +25,24 @@ within(unsigned long addr, unsigned long start, unsigned long end)
/* /*
* Flushing functions * Flushing functions
*/ */
/**
* clflush_cache_range - flush a cache range with clflush
* @addr: virtual start address
* @size: number of bytes to flush
*
* clflush is an unordered instruction which needs fencing with mfence
* to avoid ordering issues.
*/
void clflush_cache_range(void *addr, int size) void clflush_cache_range(void *addr, int size)
{ {
int i; int i;
mb();
for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size) for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
clflush(addr+i); clflush(addr+i);
mb();
} }
static void __cpa_flush_all(void *arg) static void __cpa_flush_all(void *arg)