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

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Message-ID: <20200907082114.GA714195@kroah.com>
Date:   Mon, 7 Sep 2020 10:21:14 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     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 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.

thanks,

greg k-h