linux-kernel - [PATCH] sched: update root-domain spans upon departure

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Message-ID: <20071205224429.4572.92409.stgit@novell1.haskins.net>
Date:	Wed, 05 Dec 2007 17:45:33 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	ghaskins@...ell.com
Subject: [PATCH] sched: update root-domain spans upon departure

Hmm...I made a last second "optimization" before sending that patch out and
then realized it was racy.  Try this one instead...(sorry for the churn)

-Greg

------------------------------
sched: update root-domain spans upon departure

We shouldnt leave cpus enabled in the spans if that RQ has left the domain.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 05a9a81..02f04bc 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5843,6 +5843,9 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 				class->leave_domain(rq);
 		}
 
+		cpu_clear(rq->cpu, old_rd->span);
+		cpu_clear(rq->cpu, old_rd->online);
+
 		if (atomic_dec_and_test(&old_rd->refcount))
 			kfree(old_rd);
 	}

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