linux-kernel - Re: PATCH: /proc/acpi/alarm: handle day-of-month wraparound on readback

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Message-id: <alpine.LFD.2.00.0812011311490.3197@localhost.localdomain>
Date:	Mon, 01 Dec 2008 13:18:50 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Mark Lord <lkml@....ca>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	David Brownell <david-b@...bell.net>,
	lkml <linux-kernel@...r.kernel.org>, rtc-linux@...glegroups.com,
	linux-acpi@...r.kernel.org
Subject: Re: PATCH: /proc/acpi/alarm: handle day-of-month wraparound on readback



On Mon, 1 Dec 2008, Mark Lord wrote:

> Fix month wrap issue with readback from /proc/acpi/alarm
> This bug has been around *forever*.
> 
> $ echo '2008-12-01 10:36:20' > /proc/acpi/alarm
> $ cat /proc/acpi/alarm
> 2008-11-01 10:36:20
> 
> Note how the readback above shows the month incorrectly.
> But with this patch applied, it shows the correct month (12).
> 
> Patch applies/works on kernels 2.6.25.* through 2.6.27.*,
> and probably on earlier kernels as well.

We've had some BCD_TO_BIN() changes here in 2.6.28 already,
does 2.6.28-rc still have this bug?

I'd check myself, but I don't have a /proc/acpi/alarm due to this:

#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || 
!defined(CONFIG_X86)
/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
#else
#define HAVE_ACPI_LEGACY_ALARM
#endif


thanks,
-Len

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