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SubjectRe: [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
> * 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 <>
> Signed-off-by: Feng Tang <>
> ---
> 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

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