Commit-ID: 2a0c772f1967565d5b71a98012e74d5a7bddc1c4 Gitweb: http://git.kernel.org/tip/2a0c772f1967565d5b71a98012e74d5a7bddc1c4 Author: Ross Zwisler <ross.zwis...@linux.intel.com> AuthorDate: Wed, 26 Feb 2014 12:06:51 -0700 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Thu, 27 Feb 2014 08:26:20 -0800
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.zwis...@linux.intel.com> Link: http://lkml.kernel.org/r/1393441612-19729-4-git-send-email-ross.zwis...@linux.intel.com Signed-off-by: H. Peter Anvin <h...@linux.intel.com> --- drivers/gpu/drm/drm_cache.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index bb8f580..c518fb6 100644 --- 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); + clflushopt(page_virtual + i); kunmap_atomic(page_virtual); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
