linux-kernel - Re: [PATCH] mm/slub: remove duplicate flag in allocate

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Date:   Sun, 10 Apr 2022 16:42:08 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Jiyoup Kim <lakroforce@...il.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Ohhoon Kwon <ohkwon1043@...il.com>,
        JaeSang Yoo <jsyoo5b@...il.com>,
        Wonhyuk Yang <vvghjk1234@...il.com>,
        Donghyeok Kim <dthex5d@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: remove duplicate flag in allocate_slab()

On Sun, Apr 10, 2022 at 12:05:37AM +0900, Jiyoup Kim wrote:
> In allocate_slab(), __GFP_NOFAIL flag is removed twice when trying
> higher-order allocation. Remove it.
> 
> Signed-off-by: Jiyoup Kim <lakroforce@...il.com>
> ---
>  mm/slub.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 74d92aa4a3a2..a0e605ab3036 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1939,7 +1939,7 @@ static struct slab *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
>  	 */
>  	alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL;
>  	if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min))
> -		alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL);
> +		alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~__GFP_RECLAIM;
>  
>  	slab = alloc_slab_page(alloc_gfp, node, oo);
>  	if (unlikely(!slab)) {

Looks good to me.

Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Thanks!

> -- 
> 2.25.1
> 
> 

-- 
Thanks,
Hyeonggon