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From: Jens Axboe <>
To: Pavel Begunkov <>,
	Arnd Bergmann <>,
	Greg Kroah-Hartman <>,
Subject: Re: [PATCH v2] /dev/mem: nowait zero/null ops
Date: Wed, 8 Sep 2021 13:15:27 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 9/8/21 1:10 PM, Pavel Begunkov wrote:
> Make read_iter_zero() to honor IOCB_NOWAIT, so /dev/zero can be
> advertised as FMODE_NOWAIT. It's useful for io_uring, which needs it to
> apply certain optimisations when doing I/O against the device.
> Set FMODE_NOWAIT for /dev/null as well, it never waits and therefore
> trivially meets the criteria.

Reviewed-by: Jens Axboe <>

Jens Axboe

      reply	other threads:[~2021-09-08 19:15 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 19:10 Pavel Begunkov
2021-09-08 19:15 ` Jens Axboe [this message]

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