From 606be04724b6003bd00038c43eb9e1ae5e9c0993 Mon Sep 17 00:00:00 2001
From: Bhanusree <bhanusreemahesh@gmail.com>
Date: Thu, 24 Oct 2019 09:58:33 +0530
Subject: drm/gpu: Add comment for memory barrier
Git-commit: 606be04724b6003bd00038c43eb9e1ae5e9c0993
Patch-mainline: v5.5-rc1
References: bsc#1152472
-Add comment for memory barrier
-Issue found using checkpatch.pl
Signed-off-by: Bhanusree <bhanusreemahesh@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1571891313-14341-1-git-send-email-bhanusreemahesh@gmail.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/drm_cache.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 3bd76e918b5d..e574261f6bc3 100644
--- 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
--
2.28.0