linux-kernel - Re: [PATCH] hugetlbfs: always use address space in inode for resv

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Message-Id: <20190509161135.00b542e5b4d0996b5089ea02@linux-foundation.org>
Date:   Thu, 9 May 2019 16:11:35 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     yuyufen <yuyufen@...wei.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] hugetlbfs: always use address space in inode for
 resv_map pointer

On Wed, 8 May 2019 13:16:09 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> > I think it is better to add fixes label, like:
> > Fixes: 58b6e5e8f1ad ("hugetlbfs: fix memory leak for resv_map")
> > 
> > Since the commit 58b6e5e8f1a has been merged to stable, this patch also be needed.
> > https://www.spinics.net/lists/stable/msg298740.html
> 
> It must have been the AI that decided 58b6e5e8f1a needed to go to stable.

grr.

> Even though this technically does not fix 58b6e5e8f1a, I'm OK with adding
> the Fixes: to force this to go to the same stable trees.

Why are we bothering with any of this, given that

: Luckily, private_data is NULL for address spaces in all such cases
: today but, there is no guarantee this will continue.

?

Even though 58b6e5e8f1ad was inappropriately backported, the above
still holds, so what problem does a backport of "hugetlbfs: always use
address space in inode for resv_map pointer" actually solve?

And yes, some review of this would be nice