drm/gpu: Add comment for memory barrier

-Add comment for memory barrier -Issue found using checkpatch.pl Signed-off-by: Bhanusree <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
sudhin-joseph · Oct 24, 2019 · 606be04 · 606be04
1 parent 2ec35bd
commit 606be04
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
@@ -62,10 +62,10 @@ static void drm_cache_flush_clflush(struct page *pages[],
 {
 	unsigned long i;
 
-	mb();
+	mb(); /*Full memory barrier used before so that CLFLUSH is ordered*/
 	for (i = 0; i < num_pages; i++)
 		drm_clflush_page(*pages++);
-	mb();
+	mb(); /*Also used after CLFLUSH so that all cache is flushed*/
 }
 #endif