[PATCH v2] drm/gpu: Add comment for memory barrier

[Daniel Vetter]

On Thu, Oct 24, 2019 at 09:58:33AM +0530, Bhanusree wrote:
> -Add comment for memory barrier
> -Issue found using checkpatch.pl
> 
> Signed-off-by: Bhanusree <bhanusreemahesh at gmail.com>
> ---
> 
> v2:modified memory barrier comments appropriately

Applied, thanks.
-Daniel

> 
>  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 3bd76e9..e574261 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
>  
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch