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RTC_DRV_CMOS can break userspace interface

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From: Matthew Garrett <mjg59@...>
To: <linux-kernel@...>, <linux-acpi@...>
Cc: <david-b@...>
Subject: RTC_DRV_CMOS can break userspace interface
Date: Sunday, May 27, 2007 - 3:03 pm

f5f72b46c349fefcfd4421b2213c6ffb324c5e56 appears to break the userspace 
interface to the CMOS alarm. This could previously be accessed via 
/proc/acpi/alarm, but if RTC_DRV_CMOS is enabled that vanishes. The help 
text for the module doesn't mention this, which makes tracking it down a 
touch irritating.

I'm not actually sure why this is the case. It doesn't look like the two 
interfaces are fundamentally incompatible. I agree that removing the 
proc code is a good long-term aim, but it'd be nice to be able to test 
the new RTC code without removing existing functionality.

(It doesn't really help that rtc-cmos doesn't load on this machine, but 
I'll try to track that down later - right now I suspect some sort of PNP 
issue)
-- 
Matthew Garrett | mjg59@srcf.ucam.org
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Messages in current thread:
RTC_DRV_CMOS can break userspace interface, Matthew Garrett, (Sun May 27, 3:03 pm)
Re: RTC_DRV_CMOS can break userspace interface, David Brownell, (Sun May 27, 9:36 pm)
Re: RTC_DRV_CMOS can break userspace interface, Matthew Garrett, (Sun May 27, 7:39 pm)
Re: RTC_DRV_CMOS can break userspace interface, Matthew Garrett, (Sun May 27, 8:38 pm)
Re: RTC_DRV_CMOS can break userspace interface, David Brownell, (Sun May 27, 9:44 pm)
[PATCH] RTC: Use fallback IRQ if PNP tables don't provide one, Matthew Garrett, (Mon May 28, 1:24 pm)
Re: [PATCH] RTC: Use fallback IRQ if PNP tables don't provid..., David Brownell, (Mon May 28, 5:06 pm)
Re: RTC_DRV_CMOS can break userspace interface, Matthew Garrett, (Sun May 27, 10:16 pm)