linux-kernel - Re: [PATCH] mm/hugeltb: fix renaming of PF_MEMALLOC_NOCMA to PF_MEMALLOC

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Date:   Thu, 1 Apr 2021 10:26:36 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/hugeltb: fix renaming of PF_MEMALLOC_NOCMA to PF_MEMALLOC_PIN

On Wed, Mar 31, 2021 at 12:38 PM Mike Rapoport <rppt@...nel.org> wrote:
>
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> The renaming of PF_MEMALLOC_NOCMA to PF_MEMALLOC_PIN missed one occurrence
> in mm/hugetlb.c which causes build error:
>
>   CC      mm/hugetlb.o
> mm/hugetlb.c: In function ‘dequeue_huge_page_node_exact’:
> mm/hugetlb.c:1081:33: error: ‘PF_MEMALLOC_NOCMA’ undeclared (first use in this function); did you mean ‘PF_MEMALLOC_NOFS’?
>   bool pin = !!(current->flags & PF_MEMALLOC_NOCMA);
>                                  ^~~~~~~~~~~~~~~~~
>                                  PF_MEMALLOC_NOFS
> mm/hugetlb.c:1081:33: note: each undeclared identifier is reported only once for each function it appears in
> scripts/Makefile.build:273: recipe for target 'mm/hugetlb.o' failed
> make[2]: *** [mm/hugetlb.o] Error 1
>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  mm/hugetlb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index a5236c2f7bb2..c22111f3da20 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1078,7 +1078,7 @@ static void enqueue_huge_page(struct hstate *h, struct page *page)
>  static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
>  {
>         struct page *page;
> -       bool pin = !!(current->flags & PF_MEMALLOC_NOCMA);
> +       bool pin = !!(current->flags & PF_MEMALLOC_PIN);

Thank you Mike!

Andrew, since "mm cma: rename PF_MEMALLOC_NOCMA to PF_MEMALLOC_PIN" is
not yet in the mainline, should I send a new version of this patch so
we won't have bisecting problems in the future?

Thank you,
Pasha