[tip:x86/cpu] x86: Use clflushopt in drm_clflush_virt_range

[tip-bot for Ross Zwisler]

Commit-ID:  2a0788dc9bc46789ec98aea0f30c6fb420196b12
Gitweb:     http://git.kernel.org/tip/2a0788dc9bc46789ec98aea0f30c6fb420196b12
Author:     Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 26 Feb 2014 12:06:52 -0700
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Thu, 27 Feb 2014 08:26:31 -0800

x86: Use clflushopt in drm_clflush_virt_range

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

Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1393441612-19729-5-git-send-email-ross.zwisler@xxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index c518fb6..534cb89 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -139,7 +139,7 @@ drm_clflush_virt_range(char *addr, unsigned long length)
 		mb();
 		for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
 			clflush(addr);
-		clflush(end - 1);
+		clflushopt(end - 1);
 		mb();
 		return;
 	}
--
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