linux-kernel - Re: Linux 2.6.23.10

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Date:	Sat, 15 Dec 2007 03:55:40 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...nel.org
Subject: Re: Linux 2.6.23.10

On Saturday, 15 of December 2007, Rafael J. Wysocki wrote:
> On Saturday, 15 of December 2007, Chuck Ebbert wrote:
> > On 12/14/2007 08:52 PM, Rafael J. Wysocki wrote:
> > > On Saturday, 15 of December 2007, Chuck Ebbert wrote:
> > >> On 12/14/2007 02:49 PM, Greg Kroah-Hartman wrote:
> > >>>       Freezer: Fix APM emulation breakage
> > >> drivers/char/apm-emulation.c: In function 'apm_ioctl':
> > >> drivers/char/apm-emulation.c:370: error: implicit declaration of function 'wait_event_freezable'
> > >> make[2]: *** [drivers/char/apm-emulation.o] Error 1
> > >> make[1]: *** [drivers/char] Error 2
> > > 
> > > This is my fault, sorry.
> > > 
> > > I though the 2.6.24-rc fix would be suitable for 2.6.23.x, but that's not the
> > > case.
> > > 
> > > Greg, please revert the "Freezer: Fix APM emulation breakage" patch, I'll
> > > prepare a separate fix suitable for -stable.
> > > 
> > 
> > It works if you add the changes to freezer.h made in commit
> > e42837bcd35b75bb59ae5d3e62f87be1aeeb05c3
> 
> Yes, exactly, but a new patch is needed anyway.
> 
> Hmm, perhaps it's better to add a new patch on top of "Freezer: Fix APM
> emulation breakage"?  Would that be preferred?

For convenience, below is the patch that should fix the breakage when applied
on top of the "Freezer: Fix APM emulation breakage" patch.

Thanks,
Rafael


---
From: Rafael J. Wysocki <rjw@...k.pl>

This patch is needed to fix the compilation breakage in the
APM emulation driver in 2.6.23.10 caused by the
"Freezer: Fix APM emulation breakage" patch.

The changes introduced by this patch are already in the
mainline (commit e42837bcd35b75bb59ae5d3e62f87be1aeeb05c3).

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 include/linux/freezer.h |   38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

Index: linux-2.6.23.y/include/linux/freezer.h
===================================================================
--- linux-2.6.23.y.orig/include/linux/freezer.h
+++ linux-2.6.23.y/include/linux/freezer.h
@@ -4,6 +4,7 @@
 #define FREEZER_H_INCLUDED
 
 #include <linux/sched.h>
+#include <linux/wait.h>
 
 #ifdef CONFIG_PM_SLEEP
 /*
@@ -126,6 +127,36 @@ static inline void set_freezable(void)
 	current->flags &= ~PF_NOFREEZE;
 }
 
+/*
+ * Freezer-friendly wrappers around wait_event_interruptible() and
+ * wait_event_interruptible_timeout(), originally defined in <linux/wait.h>
+ */
+
+#define wait_event_freezable(wq, condition)				\
+({									\
+	int __retval;							\
+	do {								\
+		__retval = wait_event_interruptible(wq, 		\
+				(condition) || freezing(current));	\
+		if (__retval && !freezing(current))			\
+			break;						\
+		else if (!(condition))					\
+			__retval = -ERESTARTSYS;			\
+	} while (try_to_freeze());					\
+	__retval;							\
+})
+
+
+#define wait_event_freezable_timeout(wq, condition, timeout)		\
+({									\
+	long __retval = timeout;					\
+	do {								\
+		__retval = wait_event_interruptible_timeout(wq,		\
+				(condition) || freezing(current),	\
+				__retval); 				\
+	} while (try_to_freeze());					\
+	__retval;							\
+})
 #else /* !CONFIG_PM_SLEEP */
 static inline int frozen(struct task_struct *p) { return 0; }
 static inline int freezing(struct task_struct *p) { return 0; }
@@ -143,6 +174,13 @@ static inline void freezer_do_not_count(
 static inline void freezer_count(void) {}
 static inline int freezer_should_skip(struct task_struct *p) { return 0; }
 static inline void set_freezable(void) {}
+
+#define wait_event_freezable(wq, condition)				\
+		wait_event_interruptible(wq, condition)
+
+#define wait_event_freezable_timeout(wq, condition, timeout)		\
+		wait_event_interruptible_timeout(wq, condition, timeout)
+
 #endif /* !CONFIG_PM_SLEEP */
 
 #endif	/* FREEZER_H_INCLUDED */
--
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