linux-kernel - [PATCH 1.5/2] generic-smp: fix initial quiesent count.

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Message-Id: <1234622474.4698.25.camel@laptop>
Date:	Sat, 14 Feb 2009 15:41:14 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH 1.5/2] generic-smp: fix initial quiesent count.

Subject: generic-smp: fix initial quiesent count.
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Sat Feb 14 15:36:07 CET 2009

If we start with a quiesent sequence count of 0, we'll match the initial stamp
values of the cfd_data, and never make any progress.

To avoid getting stuck in this situation, start out with an increased quiesent
sequence count.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/smp.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/kernel/smp.c
===================================================================
--- linux-2.6.orig/kernel/smp.c
+++ linux-2.6/kernel/smp.c
@@ -27,6 +27,7 @@ static struct {
 } call_function __cacheline_aligned_in_smp = {
 	.queue = LIST_HEAD_INIT(call_function.queue),
 	.lock  = __SPIN_LOCK_UNLOCKED(call_function.lock),
+	.quiesent = 1;
 };
 
 enum {


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