linux-kernel - Re: [PATCH v3] async: Add cmdline option to specify drivers to be async probed

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Message-ID: <20190130071602.GB3657@kroah.com>
Date:   Wed, 30 Jan 2019 08:16:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Feng Tang <feng.tang@...el.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] async: Add cmdline option to specify drivers to be
 async probed

On Wed, Jan 30, 2019 at 02:38:07PM +0800, Feng Tang wrote:
> Asynchronous driver probing can help much on kernel fastboot, and
> this option can provide a flexible way to optimize and quickly verify
> async driver probe.
> 
> Also it will help in below cases:
> * Some driver actually covers several families of HWs, some of which
>   could use async probing while others don't. So we can't simply
>   turn on the PROBE_PREFER_ASYNCHRONOUS flag in driver, but use this
>   cmdline option, like igb driver async patch discussed at
>   https://www.spinics.net/lists/netdev/msg545986.html
> 
> * For SOC (System on Chip) with multiple spi or i2c controllers, most
>   of the slave spi/i2c devices will be assigned with fixed controller
>   number, while async probing may make those controllers get different
>   index for each boot, which prevents those controller drivers to be
>   async probed. For platforms not using these spi/i2c slave devices,
>   they can use this cmdline option to benefit from the async probing.
> 
> Suggested-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> ---
>  drivers/base/dd.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)

This is v3 and yet no change information below the --- line saying what
is different from previous versions at all?

Not good, please fix.

greg k-h