linux-kernel - Re: [PATCH] fs/dax: Fix pmd vs pte conflict detection

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Date:   Mon, 21 Oct 2019 07:44:51 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jeff Moyer <jmoyer@...hat.com>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jeff Smits <jeff.smits@...el.com>,
        Doug Nelson <doug.nelson@...el.com>,
        stable <stable@...r.kernel.org>, Jan Kara <jack@...e.cz>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs/dax: Fix pmd vs pte conflict detection

On Mon, Oct 21, 2019 at 5:07 AM Jeff Moyer <jmoyer@...hat.com> wrote:
>
> Dan Williams <dan.j.williams@...el.com> writes:
>
> > Check for NULL entries before checking the entry order, otherwise NULL
> > is misinterpreted as a present pte conflict. The 'order' check needs to
> > happen before the locked check as an unlocked entry at the wrong order
> > must fallback to lookup the correct order.
>
> Please include the user-visible effects of the problem in the changelog.
>

Yup, I noticed that right after sending.