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Message-ID: <CAJuCfpF21a7seLpEcoWbDLDWUznAOdQo9P6LERmi-iyKMgQGXA@mail.gmail.com>
Date:   Wed, 25 Jan 2023 16:51:44 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     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, peterjung1337@...il.com, rientjes@...gle.com,
        axelrasmussen@...gle.com, joelaf@...gle.com, minchan@...gle.com,
        jannh@...gle.com, shakeelb@...gle.com, tatashin@...gle.com,
        edumazet@...gle.com, gthelen@...gle.com, gurua@...gle.com,
        arjunroy@...gle.com, soheil@...gle.com, hughlynch@...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
Subject: Re: [PATCH v3 2/7] mm: introduce vma->vm_flags wrapper functions

On Wed, Jan 25, 2023 at 4:24 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Wed, 25 Jan 2023 15:35:49 -0800 Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> > vm_flags are among VMA attributes which affect decisions like VMA merging
> > and splitting. Therefore all vm_flags modifications are performed after
> > taking exclusive mmap_lock to prevent vm_flags updates racing with such
> > operations. Introduce modifier functions for vm_flags to be used whenever
> > flags are updated. This way we can better check and control correct
> > locking behavior during these updates.
> >
> > ...
> >
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > +static inline void init_vm_flags(struct vm_area_struct *vma,
> > +static inline void reset_vm_flags(struct vm_area_struct *vma,
> > +static inline void set_vm_flags(struct vm_area_struct *vma,
> > +static inline void clear_vm_flags(struct vm_area_struct *vma,
> > +static inline void mod_vm_flags(struct vm_area_struct *vma,
>
> vm_flags_init(), vm_flags_reset(), etc?
>
> This would be more idiomatic and I do think the most-significant-first
> naming style is preferable.

Thanks for the suggestion! I will rename them in the next version.

>
> --
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