linux-kernel - Re: [PATCH v4 4/7] mm: replace vma->vm_flags direct modifications with modifier calls

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Date:   Tue, 31 Jan 2023 16:03:49 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>, michel@...pinasse.org,
        jglisse@...gle.com, mhocko@...e.com, vbabka@...e.cz,
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        leewalsh@...gle.com, posk@...gle.com, linux-mm@...ck.org,
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        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH v4 4/7] mm: replace vma->vm_flags direct modifications
 with modifier calls

On Tue, Jan 31, 2023 at 3:12 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 31 Jan 2023 13:08:19 -0800 Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> > On Tue, Jan 31, 2023 at 12:54 PM Andrew Morton
> > <akpm@...ux-foundation.org> wrote:
> > >
> > > On Tue, 31 Jan 2023 10:54:22 -0800 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > >
> > > > > > -             vma->vm_flags &= ~VM_MAYWRITE;
> > > > > > +             vm_flags_clear(vma, VM_MAYSHARE);
> > > > > >       }
> > > > >
> > > > > I think it should be:
> > > > >         s/VM_MAYSHARE/VM_MAYWRITE/
> > > >
> > >
> > > I added the fixup.  Much better than resending a seven patch series for a
> > > single line change.  Unless you have substantial other changes pending.
> >
> > Thanks! That sounds reasonable.
> >
> > I'll also need to introduce vm_flags_reset_once() to use in
> > replacement of WRITE_ONCE(vma->vm_flags, newflags) case. Should I send
> > a separate short patch for that?
>
> That depends on what the patch looks like.  How about you send it
> and we'll see?

Here it is: https://lore.kernel.org/all/20230201000116.1333160-1-surenb@google.com/

>
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