linux-kernel - Re: [PATCH 5/9] gpiolib: use gpio_chips list in gpiochip_find

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Date:	Wed, 6 Feb 2013 13:48:19 +0900
From:	Alex Courbot <acourbot@...dia.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gnurou@...il.com" <gnurou@...il.com>
Subject: Re: [PATCH 5/9] gpiolib: use gpio_chips list in gpiochip_find_base

On 02/06/2013 02:21 AM, Linus Walleij wrote:
> This looks like it is preserving this userspace-sensitive semantic
> so that dynamically added chips will still get the same assigned
> numbers.

It does (it should, at least), the assigned ranges should be strictly 
identical to the previous version. While testing I also made sure all 
chips had the same GPIO range.

> But I want some guarantees, so state clearly in the commit
> that any dynamically assigned chip will get the same base
> address after this change as it got before it, and please take
> this opportunity to add a comment stating that this search
> method is vital for userspace ABIs, and must be preserved.

Done. I will take the blame if something goes wrong. :)

Thanks,
Alex.


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