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x86: Use clflushopt in drm_clflush_page 

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

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Link: http://lkml.kernel.org/r/1393441612-19729-4-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 12:06:51 -07:00 committed by H. Peter Anvin
parent 8b80fd8b45
commit 2a0c772f19
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/drm_cache.c
View File

@ -32,6 +32,12 @@
#include <drm/drmP.h>
#if defined(CONFIG_X86)
/*
* clflushopt is an unordered instruction which needs fencing with mfence or
* sfence to avoid ordering issues. For drm_clflush_page this fencing happens
* in the caller.
*/
static void
drm_clflush_page(struct page *page)
{
@ -44,7 +50,7 @@ drm_clflush_page(struct page *page)
page_virtual = kmap_atomic(page);
for (i = 0; i < PAGE_SIZE; i += size)
clflush(page_virtual + i);
clflushopt(page_virtual + i);
kunmap_atomic(page_virtual);
}