linux-kernel - [tip:sched/urgent] sched: Mark boot-cpu active before smp

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Message-ID: <tip-933b0618d8b2a59c7a0742e43836544e02f1e9bd@git.kernel.org>
Date:	Wed, 16 Dec 2009 18:36:34 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Mark boot-cpu active before smp_init()

Commit-ID:  933b0618d8b2a59c7a0742e43836544e02f1e9bd
Gitweb:     http://git.kernel.org/tip/933b0618d8b2a59c7a0742e43836544e02f1e9bd
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 16 Dec 2009 18:04:31 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 16 Dec 2009 19:01:53 +0100

sched: Mark boot-cpu active before smp_init()

A UP machine has 1 active cpu, not having the boot-cpu in the
active map when starting the scheduler confuses things.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
LKML-Reference: <20091216170517.423469527@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 init/main.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/init/main.c b/init/main.c
index c3db4a9..dac44a9 100644
--- a/init/main.c
+++ b/init/main.c
@@ -369,12 +369,6 @@ static void __init smp_init(void)
 {
 	unsigned int cpu;
 
-	/*
-	 * Set up the current CPU as possible to migrate to.
-	 * The other ones will be done by cpu_up/cpu_down()
-	 */
-	set_cpu_active(smp_processor_id(), true);
-
 	/* FIXME: This should be done in userspace --RR */
 	for_each_present_cpu(cpu) {
 		if (num_online_cpus() >= setup_max_cpus)
@@ -486,6 +480,7 @@ static void __init boot_cpu_init(void)
 	int cpu = smp_processor_id();
 	/* Mark the boot cpu "present", "online" etc for SMP and UP case */
 	set_cpu_online(cpu, true);
+	set_cpu_active(cpu, true);
 	set_cpu_present(cpu, true);
 	set_cpu_possible(cpu, true);
 }
--
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