linux-kernel - Re: [PATCH] mm: remove extra ZONE

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Message-ID: <4842558d-9626-0452-6398-c2fe39a9a31c@nvidia.com>
Date:   Wed, 16 Sep 2020 17:35:48 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>
CC:     Linux MM <linux-mm@...ck.org>, <kvm-ppc@...r.kernel.org>,
        <nouveau@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        "Matthew Wilcox" <willy@...radead.org>,
        Jerome Glisse <jglisse@...hat.com>,
        "John Hubbard" <jhubbard@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Zi Yan <ziy@...dia.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Paul Mackerras <paulus@...abs.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: remove extra ZONE_DEVICE struct page refcount


On 9/15/20 11:10 PM, Christoph Hellwig wrote:
> On Mon, Sep 14, 2020 at 04:10:38PM -0700, Dan Williams wrote:
>> You also need to fix up ext4_break_layouts() and
>> xfs_break_dax_layouts() to expect ->_refcount is 0 instead of 1. This
>> also needs some fstests exposure.
> 
> While we're at it, can we add a wait_fsdax_unref helper macro that hides
> the _refcount access from the file systems?

Sure. I'll add a separate patch for it in v2.