linux-kernel - Re: [PATCH v10 1/3] mm: rearrange madvise code to allow for reuse

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Message-ID: <20211005210003.v3zgqhefn5j65gig@revolver>
Date:   Tue, 5 Oct 2021 21:00:23 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
CC:     Rolf Eike Beer <eb@...ix.com>,
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Subject: Re: [PATCH v10 1/3] mm: rearrange madvise code to allow for reuse

* Suren Baghdasaryan <surenb@...gle.com> [211004 12:18]:
> On Mon, Oct 4, 2021 at 12:03 AM Rolf Eike Beer <eb@...ix.com> wrote:
> >
> > > --- a/mm/madvise.c
> > > +++ b/mm/madvise.c
> > > @@ -63,76 +63,20 @@ static int madvise_need_mmap_write(int behavior)
> > >  }
> > >
> > >  /*
> > > - * We can potentially split a vm area into separate
> > > - * areas, each area with its own behavior.
> > > + * Update the vm_flags on regiion of a vma, splitting it or merging it as
> >                                 ^^
> 
> Thanks! Will fix in the next version.

Since you'll be respinning for this comment, can you please point out
that the split will keep the VMA as [vma->vm_start, new_end)?  That is,
__split_vma() is passed 0 for new_below.  It might prove useful since
the code is being reused.

Thanks,
Liam

> 
> >
> > Eike
> > --
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