linux-kernel - [PATCH 4/7] Freezer: Take kernel

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Message-Id: <200705110039.04898.rjw@sisk.pl>
Date:	Fri, 11 May 2007 00:39:03 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Gautham R Shenoy <ego@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>, Pavel Machek <pavel@....cz>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 4/7] Freezer: Take kernel_execve into consideration

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

Kernel threads can become userland processes by calling kernel_execve().  In
particular, this may happen right after
try_to_freeze_tasks(FREEZER_USER_SPACE) has returned, so try_to_freeze_tasks()
needs to take userspace processes into consideration even if it is called with
FREEZER_KERNEL_THREADS.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Acked-by: Pavel Machek <pavel@....cz>
---
 kernel/power/process.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/kernel/power/process.c
===================================================================
--- linux-2.6.orig/kernel/power/process.c	2007-05-10 21:44:36.000000000 +0200
+++ linux-2.6/kernel/power/process.c	2007-05-10 21:44:40.000000000 +0200
@@ -126,7 +126,7 @@ static unsigned int try_to_freeze_tasks(
 				cancel_freezing(p);
 				continue;
 			}
-			if (is_user_space(p) == !freeze_user_space)
+			if (freeze_user_space && !is_user_space(p))
 				continue;
 
 			freeze_process(p);
@@ -153,7 +153,7 @@ static unsigned int try_to_freeze_tasks(
 				TIMEOUT / HZ, todo);
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
-			if (is_user_space(p) == !freeze_user_space)
+			if (freeze_user_space && !is_user_space(p))
 				continue;
 
 			task_lock(p);

-
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