linux-kernel - Re: [PATCH v4 20/22] driver core: Allow deferring probes until late init

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Message-ID: <20150911121746.GR12027@sirena.org.uk>
Date:	Fri, 11 Sep 2015 13:17:46 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-acpi@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v4 20/22] driver core: Allow deferring probes until late
 init

On Mon, Sep 07, 2015 at 02:23:45PM +0200, Tomeu Vizoso wrote:
> Add a field to struct device that instructs the device-driver core to
> defer the probe of this device until the late_initcall level.
> 
> By letting all built-in drivers to register before starting to probe, we
> can avoid any deferred probes by probing dependencies on demand.

Is this not going to resut in massive churn as we go through and set
this flag for a massive proportion of drivers?  Could we mitigate this
by having a first pass at setting this per subsystem or something so
that we get a good proportion of drivers with changes in core code?

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