linux-kernel - Re: [PATCH v2 04/12] mm/hugetlb: use provided ac->gfp

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Message-ID: <20200609132629.GF22623@dhcp22.suse.cz>
Date:   Tue, 9 Jun 2020 15:26:29 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     js1304@...il.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@...radead.org>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 04/12] mm/hugetlb: use provided ac->gfp_mask for
 allocation

On Wed 27-05-20 15:44:55, Joonsoo Kim wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> gfp_mask handling on alloc_huge_page_(node|nodemask) is
> slightly changed, from ASSIGN to OR. It's safe since caller of these
> functions doesn't pass extra gfp_mask except htlb_alloc_mask().
> 
> This is a preparation step for following patches.

This patch on its own doesn't make much sense to me. Should it be folded
in the patch which uses that?

> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  mm/hugetlb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 453ba94..dabe460 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1985,7 +1985,7 @@ struct page *alloc_huge_page_node(struct hstate *h,
>  {
>  	struct page *page = NULL;
>  
> -	ac->gfp_mask = htlb_alloc_mask(h);
> +	ac->gfp_mask |= htlb_alloc_mask(h);
>  	if (ac->nid != NUMA_NO_NODE)
>  		ac->gfp_mask |= __GFP_THISNODE;
>  
> @@ -2004,7 +2004,7 @@ struct page *alloc_huge_page_node(struct hstate *h,
>  struct page *alloc_huge_page_nodemask(struct hstate *h,
>  				struct alloc_control *ac)
>  {
> -	ac->gfp_mask = htlb_alloc_mask(h);
> +	ac->gfp_mask |= htlb_alloc_mask(h);
>  
>  	spin_lock(&hugetlb_lock);
>  	if (h->free_huge_pages - h->resv_huge_pages > 0) {
> -- 
> 2.7.4
> 

-- 
Michal Hocko
SUSE Labs