linux-kernel - Re: [PATCHv2 1/2] mm: Fix vma_is

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Message-ID: <20180712162039.GA16175@redhat.com>
Date:   Thu, 12 Jul 2018 18:20:39 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCHv2 1/2] mm: Fix vma_is_anonymous() false-positives

Kirill, I am not trying to review this change (but it looks good to me),
just a silly question...

On 07/12, Kirill A. Shutemov wrote:
>
> This can be fixed by assigning anonymous VMAs own vm_ops and not relying
> on it being NULL.

I agree, this makes sense, but...

> If ->mmap() failed to set ->vm_ops, mmap_region() will set it to
> dummy_vm_ops.

Shouldn't this change alone fix the problem?

Oleg.