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 15:12:09 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>, michel@...pinasse.org,
        jglisse@...gle.com, mhocko@...e.com, vbabka@...e.cz,
        hannes@...xchg.org, mgorman@...hsingularity.net, dave@...olabs.net,
        willy@...radead.org, liam.howlett@...cle.com, peterz@...radead.org,
        ldufour@...ux.ibm.com, paulmck@...nel.org, mingo@...hat.com,
        will@...nel.org, luto@...nel.org, songliubraving@...com,
        peterx@...hat.com, david@...hat.com, dhowells@...hat.com,
        hughd@...gle.com, bigeasy@...utronix.de, kent.overstreet@...ux.dev,
        punit.agrawal@...edance.com, lstoakes@...il.com,
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        gurua@...gle.com, arjunroy@...gle.com, soheil@...gle.com,
        leewalsh@...gle.com, posk@...gle.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        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, 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?