linux-kernel - Re: [PATCH 2/3] hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race

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Date:   Tue, 18 Dec 2018 14:10:53 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/3] hugetlbfs: Use i_mmap_rwsem to fix page
 fault/truncate race

On Mon, 17 Dec 2018 16:17:52 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> ...
>
> > As you suggested in a comment to the subsequent patch, it would be better to
> > combine the patches and remove the dead code when it becomes dead.  I will
> > work on that.  Actually some of the code in patch 3 applies to patch 1 and
> > some applies to patch 2.  So, it will not be simply combining patch 2 and 3.
> 
> On second thought, the cleanups in patch 3 only apply to patch 2.  So, just
> combining those two patches with a slightly updated commit message as below
> makes the most sense.

All confused.  I dropped the current version, let's try again.

This:

> Hoping to get more comments on the overall direction and locking changes
> of this and the previous patch.

and this:

> Cc: <stable@...r.kernel.org>
> Fixes: ebed4bfc8da8 ("hugetlb: fix absurd HugePages_Rsvd")

make for a hot combination.  Could people please prioritize review of
this code?

Perhaps a refresh and resend is in order.