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

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Message-ID: <CAAObsKA24=JZH_ukwCcaQ+cCxL1BcVLZe=W54X-5V=3idogW5A@mail.gmail.com>
Date:	Mon, 14 Sep 2015 11:04:53 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <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" 
	<linux-arm-kernel@...ts.infradead.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"devicetree@...r.kernel.org" <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 11 September 2015 at 14:17, Mark Brown <broonie@...nel.org> wrote:
> 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?

I think this flag should be only set during the initial registration
of devices (eg. acpi_device_add, of_device_add, etc), as by delaying
the probe of those we are automatically delaying the probe of the
rest.

Regards,

Tomeu
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