linux-kernel - Re: [PATCH 3/5] RTC: Rework RTC code to use timerlist for events

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Message-ID: <m262tizhb9.fsf@whitebox.home>
Date:	Fri, 21 Jan 2011 11:23:22 +0100
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH 3/5] RTC: Rework RTC code to use timerlist for events

John Stultz <john.stultz@...aro.org> writes:

> On Thu, 2011-01-20 at 19:07 +0100, Andreas Schwab wrote:
>> John Stultz <john.stultz@...aro.org> writes:
>> 
>> > This patch reworks a large portion of the generic RTC code
>> > to in-effect virtualize the rtc interrupt code.
>> 
>> That breaks RTC on powermac which uses rtc-generic.
>> 
>> # hwclock 
>> select() to /dev/rtc0 to wait for clock tick timed out
>
> Actually, can you also send strace output?

ioctl(4, RTC_UIE_ON, 0)                 = 0
select(5, [4], NULL, NULL, {5, 0})      = 0 (Timeout)
write(2, "select() to /dev/rtc0 to wait fo"..., 55) = 55
ioctl(4, RTC_UIE_OFF, 0)                = 0

CONFIG_RTC_INTF_DEV_UIE_EMUL was never enabled, and RTC_UIE_ON returned
EINVAL before, which caused hwclock to fall back to polling.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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