linux-kernel - Re: [PATCH -mm] Move frozen_process() to kernel/power/process.c

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Date:	Thu, 26 Apr 2007 19:10:59 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH -mm] Move frozen_process() to kernel/power/process.c

On Thu, Apr 26, 2007 at 04:36:09PM +0400, Oleg Nesterov wrote:
> On 04/26, Gautham R Shenoy wrote:
> > 
> > Other than refrigerator, no one else calls frozen_process(). So move it from
> > include/linux/freezer.h to kernel/power/process.c.
> 
> Could you also remove this
> 
> 	static inline void frozen_process(struct task_struct *p) { BUG(); }
> 
> from freezer.h ?

Sure. Here's a more complete patch.

Thanks and Regards
gautham.

-->
Other than refrigerator, no one else calls frozen_process(). So move it
from include/linux/freezer.h to kernel/power/process.c.

Also, since a task can be marked frozen by itself, we don't need to pass
the (struct task_struct *p) parameter to frozen_process().

Signed-off-by: Gautham R Shenoy <ego@...ibm.com>
---
 include/linux/freezer.h |   13 -------------
 kernel/power/process.c  |   14 +++++++++++++-
 2 files changed, 13 insertions(+), 14 deletions(-)

Index: linux-2.6.21-rc7/include/linux/freezer.h
===================================================================
--- linux-2.6.21-rc7.orig/include/linux/freezer.h
+++ linux-2.6.21-rc7/include/linux/freezer.h
@@ -58,18 +58,6 @@ static inline int thaw_process(struct ta
 	return 0;
 }
 
-/*
- * freezing is complete, mark process as frozen
- */
-static inline void frozen_process(struct task_struct *p)
-{
-	if (!unlikely(p->flags & PF_NOFREEZE)) {
-		p->flags |= PF_FROZEN;
-		wmb();
-	}
-	clear_tsk_thread_flag(p, TIF_FREEZE);
-}
-
 extern void refrigerator(void);
 extern int freeze_processes(void);
 extern void thaw_processes(void);
@@ -132,7 +120,6 @@ static inline int frozen(struct task_str
 static inline int freezing(struct task_struct *p) { return 0; }
 static inline void freeze(struct task_struct *p) { BUG(); }
 static inline int thaw_process(struct task_struct *p) { return 1; }
-static inline void frozen_process(struct task_struct *p) { BUG(); }
 
 static inline void refrigerator(void) {}
 static inline int freeze_processes(void) { BUG(); return 0; }
Index: linux-2.6.21-rc7/kernel/power/process.c
===================================================================
--- linux-2.6.21-rc7.orig/kernel/power/process.c
+++ linux-2.6.21-rc7/kernel/power/process.c
@@ -32,6 +32,18 @@ static inline int freezeable(struct task
 	return 1;
 }
 
+/*
+ * freezing is complete, mark current process as frozen
+ */
+static inline void frozen_process(void)
+{
+	if (!unlikely(current->flags & PF_NOFREEZE)) {
+		current->flags |= PF_FROZEN;
+		wmb();
+	}
+	clear_tsk_thread_flag(current, TIF_FREEZE);
+}
+
 /* Refrigerator is place where frozen processes are stored :-). */
 void refrigerator(void)
 {
@@ -41,7 +53,7 @@ void refrigerator(void)
 
 	task_lock(current);
 	if (freezing(current)) {
-		frozen_process(current);
+		frozen_process();
 		task_unlock(current);
 	} else {
 		task_unlock(current);

-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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