linux-kernel - Re: [PATCH v6 21/22] driver core: Start processing deferred probes earlier

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Message-ID: <20151006104515.GJ12635@sirena.org.uk>
Date:	Tue, 6 Oct 2015 11:45:15 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Frank Rowand <frowand.list@...il.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	"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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"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" <linux-acpi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 21/22] driver core: Start processing deferred probes
 earlier

On Mon, Oct 05, 2015 at 09:49:38PM -0500, Rob Herring wrote:
> On Mon, Oct 5, 2015 at 6:52 PM, Frank Rowand <frowand.list@...il.com> wrote:

> > The purpose of the *_sync initcall levels is to allow the corresponding
> > initcall level to use multiple threads of execution instead of a single
> > thread.  The *_sync level provides a location for a wait for all of the
> > threads at the corresponding init level to complete.  This is better
> > explained in the git log:

> The things I was worried about like clk and regulator disabling are
> actually late_initcall_sync, so maybe late_initcall is fine here after
> all.

> However, looking at other *_initcall_sync users, I'm not so sure they
> are doing the same abuse.

They're trying to run at the point where we've completed deferred
probe processing - in other words, at the sync point.  What they really
want is an additional callback at the point where the syncs have
actually happened.

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