OSDN Git Service
(root)
/
uclinux-h8
/
linux.git
/ commitdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
| commitdiff |
tree
raw
|
patch
| inline |
side by side
(parent:
8b80fd8
)
x86: Use clflushopt in drm_clflush_page
author
Ross Zwisler
<ross.zwisler@linux.intel.com>
Wed, 26 Feb 2014 19:06:51 +0000
(12:06 -0700)
committer
H. Peter Anvin
<hpa@linux.intel.com>
Thu, 27 Feb 2014 16:26:20 +0000
(08:26 -0800)
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>
drivers/gpu/drm/drm_cache.c
patch
|
blob
|
history
diff --git
a/drivers/gpu/drm/drm_cache.c
b/drivers/gpu/drm/drm_cache.c
index
bb8f580
..
c518fb6
100644
(file)
--- a/
drivers/gpu/drm/drm_cache.c
+++ b/
drivers/gpu/drm/drm_cache.c
@@
-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);
+ clflush
opt
(page_virtual + i);
kunmap_atomic(page_virtual);
}