linux-kernel - [107/289] um: fix global timer issue when using CONFIG_NO

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Message-Id: <20101208005732.035977169@clark.site>
Date:	Tue, 07 Dec 2010 16:58:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Richard Weinberger <richard@....at>,
	Pekka Enberg <penberg@...nel.org>,
	Jeff Dike <jdike@...toit.com>
Subject: [107/289] um: fix global timer issue when using CONFIG_NO_HZ

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Richard Weinberger <richard@....at>

commit 482db6df1746c4fa7d64a2441d4cb2610249c679 upstream.

This fixes a issue which was introduced by fe2cc53e ("uml: track and make
up lost ticks").

timeval_to_ns() returns long long and not int.  Due to that UML's timer
did not work properlt and caused timer freezes.

Signed-off-by: Richard Weinberger <richard@....at>
Acked-by: Pekka Enberg <penberg@...nel.org>
Cc: Jeff Dike <jdike@...toit.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/um/os-Linux/time.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -60,7 +60,7 @@ static inline long long timeval_to_ns(co
 long long disable_timer(void)
 {
 	struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } });
-	int remain, max = UM_NSEC_PER_SEC / UM_HZ;
+	long long remain, max = UM_NSEC_PER_SEC / UM_HZ;
 
 	if (setitimer(ITIMER_VIRTUAL, &time, &time) < 0)
 		printk(UM_KERN_ERR "disable_timer - setitimer failed, "


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