linux-kernel - Re: [PATCH] mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic

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Date:   Fri, 15 Jul 2022 13:38:01 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/hugetlb: avoid corrupting page->mapping in
 hugetlb_mcopy_atomic_pte

On Fri, Jul 15, 2022 at 10:29:33AM -0700, Mike Kravetz wrote:
> On 07/15/22 13:07, Peter Xu wrote:
> > On Fri, Jul 15, 2022 at 09:45:37AM -0700, Axel Rasmussen wrote:
> > > I don't really have a strong preference between the two. The second option
> > > is what I originally proposed in the first version of the minor fault
> > > series, so going back to that isn't a problem at least from my perspective.
> > > If in the future we find a real use case for this, we could always easily
> > > re-enable it and add selftests for it at that point.
> > 
> > I'd go for fixing the test case if possible.  Mike, would it be fine if we
> > go back to /dev/hugepages path based approach in the test case?
> > 
> 
> No problem going back to using a file for private mapping testing.  Removing
> that was more of a simplification, because of new MADV_DONTNEED support.
> Just want to make sure we also keep remap and remove event testing.

Yeah definitely, thanks Mike!

-- 
Peter Xu