linux-kernel - Re: [patch 2.6.26-rc4-git] PM: boot time suspend selftest

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Message-Id: <20080723011954.aa7bf26e.akpm@linux-foundation.org>
Date:	Wed, 23 Jul 2008 01:19:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Brownell <david-b@...bell.net>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	Pavel Machek <pavel@...e.cz>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [patch 2.6.26-rc4-git] PM: boot time suspend selftest

On Thu, 29 May 2008 13:33:41 -0700 David Brownell <david-b@...bell.net> wrote:

> Boot-time test for system suspend states (STR or standby).  The generic
> RTC framework triggers wakeup alarms, which are used to exit those states.
> 
>   - Measures some aspects of suspend time ... this uses "jiffies" until
>     someone converts it to use a timebase that works properly even while
>     timer IRQs are disabled. 
> 
>   - Triggered by a command line parameter.  By default nothing even
>     vaguely troublesome will happen, but "test_suspend=mem" will give
>     you a brief STR test during system boot.  (Or you may need to use
>     "test_suspend=standby" instead, if your hardware needs that.)
> 
> This isn't without problems.  It fires early enough during boot that for
> example both PCMCIA and MMC stacks have misbehaved.  The workaround in
> those cases was to boot without such media cards inserted.

mips allmodconfig:

kernel/built-in.o(.init.text+0x5b30): In function `test_suspend':
: undefined reference to `rtc_class'
kernel/built-in.o(.init.text+0x5b38): In function `test_suspend':
: undefined reference to `rtc_class'
kernel/built-in.o(.init.text+0x5ba4): In function `test_suspend':
: undefined reference to `rtc_class_open'
kernel/built-in.o(.init.text+0x5c30): In function `test_suspend':
: undefined reference to `rtc_read_time'
kernel/built-in.o(.init.text+0x5d50): In function `test_suspend':
: undefined reference to `rtc_set_alarm'
kernel/built-in.o(.init.text+0x5f6c): In function `test_suspend':
: undefined reference to `rtc_class_close'

some of these are already exported, so something else went wrong.
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