linux-kernel - Re: [PATCH 1/4] gpiolib: Introduce chip addition/removal notifier

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Date:	Mon, 25 Jan 2010 22:34:29 -0800
From:	David Brownell <david-b@...bell.net>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bill Gatliff <bgat@...lgatliff.com>,
	"Dmitry Eremin-Solenikov" <dbaryshkov@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] gpiolib: Introduce chip addition/removal notifier

On Monday 25 January 2010, Anton Vorontsov wrote:
> 
> +config GPIOLIB_NOTIFIER
> +       bool
> +       help
> +         This symbol is selected by subsystems that need to handle GPIO
> +         chips addition and removal. E.g., this is used for the
> +         OpenFirmware bindings.
> +

I'm no huge fan of notifiers, but I suppose they have their place.

However ... I don't see a lot of win to making this optional.  Just
inline the little two blocking_notifier_call_chain() calls directly,
making this a *LOT* simpler.

- Dave

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