linux-kernel - Re: [PATCH v2] /dev/zero: also implement ->read

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Message-ID: <20200907082139.GA23031@lst.de>
Date:   Mon, 7 Sep 2020 10:21:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christoph Hellwig <hch@....de>, arnd@...db.de,
        linux-kernel@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH v2] /dev/zero: also implement ->read

On Mon, Sep 07, 2020 at 10:21:14AM +0200, Greg KH wrote:
> On Mon, Sep 07, 2020 at 09:51:43AM +0200, Christoph Hellwig wrote:
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add this trivial function.
> > 
> > Suggested-by: Christophe Leroy <christophe.leroy@...roup.eu>
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > Tested-by: Christophe Leroy <christophe.leroy@...roup.eu>
> > ---
> > 
> > Changes since v1:
> >  - fix the Suggested-by: tag
> >  - report the actually read bytes in case of a partial clear_user
> >  - remove an impossible to hit conditional
> > 
> >  drivers/char/mem.c | 28 ++++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> 
> I already merged your v1 into my tree, do you want me to revert that and
> then add this, or can you send me the diff to apply instead?  I can't
> rebase my public trees.

Sure, I can send an incremental one.  I vaguely remembered you as one
of the quilt holdouts.