linux-kernel - Re: linux-next: Tree for May 25 (kernel/power, SUSPEND=n)

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Date:	Tue, 25 May 2010 21:24:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-pm@...ts.linux-foundation.org, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Tree for May 25 (kernel/power, SUSPEND=n)

On Tuesday 25 May 2010, Randy Dunlap wrote:
> On Tue, 25 May 2010 14:26:57 +1000 Stephen Rothwell wrote:
> 
> > Hi all,
> > 
> > We are in the merge window again.  I remind you all not to add stuff for
> > 2.6.36 to your linux-next trees until after 2.6.35-rc1.
> 
> 
> when CONFIG_SUSPEND=n, CONFIG_OPPORTUNISTIC_SUSPEND=n, CONFIG_PM=y:
> 
> kernel/power/main.c:66: error: 'pm_states' undeclared (first use in this function)

Thanks, the patch below fixes this.

Rafael

---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: PM: Fix build with CONFIG_SUSPEND unset

If CONFIG_SUSPEND is unset, pm_state_valid() doesn't build because
the pm_states[] array is not defined, but pm_state_valid() is only
used under #ifdef CONFIG_SUSPEND, so don't try to build it if
CONFIG_SUSPEND is unset.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 kernel/power/main.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -61,10 +61,12 @@ static inline int pm_enter_state(int sta
 
 static inline bool hibernation_supported(void) { return true; }
 
+#ifdef CONFIG_SUSPEND
 static inline bool pm_state_valid(int state_idx)
 {
 	return pm_states[state_idx] && valid_state(state_idx);
 }
+#endif /* CONFIG_SUSPEND */
 
 static inline int pm_enter_state(int state_idx)
 {
--
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