linux-kernel - Re: [PATCH v2] fb_defio: Remove custom address_space

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Message-ID: <YLQALv2YENIDh77N@casper.infradead.org>
Date:   Sun, 30 May 2021 22:14:22 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        William Kucharski <william.kucharski@...cle.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Ian Campbell <ijc@...lion.org.uk>,
        linux-fsdevel@...r.kernel.org,
        Jaya Kumar <jayakumar.lkml@...il.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] fb_defio: Remove custom address_space_operations

On Sun, May 30, 2021 at 12:13:05PM -0700, Nathan Chancellor wrote:
> Hi Matthew,
> 
> On Wed, Mar 10, 2021 at 06:55:30PM +0000, Matthew Wilcox (Oracle) wrote:
> > There's no need to give the page an address_space.  Leaving the
> > page->mapping as NULL will cause the VM to handle set_page_dirty()
> > the same way that it's handled now, and that was the only reason to
> > set the address_space in the first place.
> > 
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> 
> This patch in mainline as commit ccf953d8f3d6 ("fb_defio: Remove custom
> address_space_operations") causes my Hyper-V based VM to no longer make
> it to a graphical environment.

Hi Nathan,

Thanks for the report.  I sent Daniel a revert patch with a full
explanation last week, which I assume he'll queue up for a pull soon.
You can just git revert ccf953d8f3d6 for yourself until that shows up.
Sorry for the inconvenience.