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Commit 2a0c772f authored by Ross Zwisler's avatar Ross Zwisler Committed by H. Peter Anvin
Browse files

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: default avatarRoss 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: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 8b80fd8b

drivers/gpu/drm/drm_cache.c

+7 −1
Original line number Diff line number Diff line
@@ -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);

}