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x86: Use clflushopt in clflush_cache_range

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If clflushopt is available on the system, use it instead of clflush in
clflush_cache_range.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Link: http://lkml.kernel.org/r/1393441612-19729-3-git-send-email-ross.zwisler@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Ross Zwisler 2014-02-26 12:06:50 -07:00 committed by H. Peter Anvin
parent 171699f763
commit 8b80fd8b45
1 changed files with 4 additions and 4 deletions
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8
arch/x86/mm/pageattr.c
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@ -126,8 +126,8 @@ within(unsigned long addr, unsigned long start, unsigned long end)
* @vaddr: virtual start address
* @size: number of bytes to flush
*
* clflush is an unordered instruction which needs fencing with mfence
* to avoid ordering issues.
* clflushopt is an unordered instruction which needs fencing with mfence or
* sfence to avoid ordering issues.
*/
void clflush_cache_range(void *vaddr, unsigned int size)
{
@ -136,11 +136,11 @@ void clflush_cache_range(void *vaddr, unsigned int size)
mb();
for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size)
clflush(vaddr);
clflushopt(vaddr);
/*
* Flush any possible final partial cacheline:
*/
clflush(vend);
clflushopt(vend);
mb();
}