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Message-ID: <CAJuCfpEcVCZaCGzc-Wim25eaV5e6YG1YJAAdKwZ6JHViB0z8aw@mail.gmail.com>
Date: Wed, 25 Jan 2023 08:49:50 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>
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Subject: Re: [PATCH v2 1/6] mm: introduce vma->vm_flags modifier functions
On Wed, Jan 25, 2023 at 1:10 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Wed, Jan 25, 2023 at 12:38:46AM -0800, Suren Baghdasaryan wrote:
>
> > diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> > index 2d6d790d9bed..6c7c70bf50dd 100644
> > --- a/include/linux/mm_types.h
> > +++ b/include/linux/mm_types.h
> > @@ -491,7 +491,13 @@ struct vm_area_struct {
> > * See vmf_insert_mixed_prot() for discussion.
> > */
> > pgprot_t vm_page_prot;
> > - unsigned long vm_flags; /* Flags, see mm.h. */
> > +
> > + /*
> > + * Flags, see mm.h.
> > + * WARNING! Do not modify directly.
> > + * Use {init|reset|set|clear|mod}_vm_flags() functions instead.
> > + */
> > + unsigned long vm_flags;
>
> We have __private and ACCESS_PRIVATE() to help with enforcing this.
Thanks for pointing this out, Peter! I guess for that I'll need to
convert all read accesses and provide get_vm_flags() too? That will
cause some additional churt (a quick search shows 801 hits over 248
files) but maybe it's worth it? I think Michal suggested that too in
another patch. Should I do that while we are at it?
>
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