linux-kernel - Re: [PATCH] driver core: Make probe deferral more quiet

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Message-ID: <20150310125741.GS26334@sonymobile.com>
Date:	Tue, 10 Mar 2015 05:57:41 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heiko Stuebner <heiko@...ech.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver core: Make probe deferral more quiet

On Tue 10 Mar 04:55 PDT 2015, Mark Brown wrote:

> Currently probe deferral prints a message every time a device requests
> deferral at info severity (which is displayed by default). This can have
> an impact on system boot times with serial consoles and is generally quite
> noisy.
> 
> Since subsystems and drivers should already be logging the specific reason
> for probe deferral in order to aid users in understanding problems the
> messages from the driver core should be redundant lower the severity of
> the messages printed, cutting down on the volume of output on the console.
> 
> This does mean that if the drivers and subsystems aren't doing a good job
> we get no output on the console by default. Ideally we'd be able to arrange
> to print if nothing else printed, though that's a little fun. Even better
> would be to come up with a mechanism that explicitly does dependencies so
> we don't have to keep polling and erroring.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>

I like it, much better than the suggestion I made to drop the more
informative print out in the regulator framework.

Reviewed-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>

Regards,
Bjorn
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