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

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Message-Id: <20210401171705.9bd350411cdee0db91332c92@linux-foundation.org>
Date:   Thu, 1 Apr 2021 17:17:05 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     Mike Rapoport <rppt@...nel.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 Thu, 1 Apr 2021 10:26:36 -0400 Pavel Tatashin <pasha.tatashin@...een.com> wrote:

> 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?

I've already added Mike's fix, as
mm-cma-rename-pf_memalloc_nocma-to-pf_memalloc_pin-fix.patch.  It shall
fold it into mm-cma-rename-pf_memalloc_nocma-to-pf_memalloc_pin.patch
prior to upstreaming, so no bisection issue.