linux-kernel - Re: [PATCH] rtc: Make rtc_update

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Date:	Thu, 23 Apr 2009 11:15:56 -0700
From:	David Brownell <david-b@...bell.net>
To:	Alessandro Zummo <alessandro.zummo@...ertech.it>
Cc:	Atsushi Nemoto <anemo@....ocn.ne.jp>, akpm@...ux-foundation.org,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	hcegtvedt@...el.com, vapier@...too.org, rongkai.zhan@...driver.com,
	balajirrao@...nmoko.org, broonie@...nsource.wolfsonmicro.com
Subject: Re: [PATCH] rtc: Make rtc_update_irq callable with irqs enabled

On Thursday 23 April 2009, Alessandro Zummo wrote:
>  Is not an API change, we are gradually relaxing it if it
>  proves workable :)

Erm, it *is* an API change at least to the extent that
the last version of the patch made the interface spec
become incorrect.

Current interface spec *requires* that function to be
called with IRQs disabled.

The downside of that spec is that there's no way to test
it, since CONFIG_LOCKDEP doesn't understand that almost
all IRQ handlers don't disable IRQs.  So there are some
bugs in RTC drivers that can only be uncovered by code
review.

- Dave
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