linux-kernel - Re: [PATCH v3 2/7] mm: introduce vma->vm

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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,
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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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