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From: Erich Focht <efocht@ess.nec.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
	"linux-kernel" <linux-kernel@vger.kernel.org>,
	Robert Love <rml@tech9.net>
Subject: small migration thread fix
Date: Fri, 10 Jan 2003 13:46:03 +0100	[thread overview]
Message-ID: <200301101346.03653.efocht@ess.nec.de> (raw)

[-- Attachment #1: Type: text/plain, Size: 231 bytes --]

Hi,

the small patch fixes a potential problem in the migration thread for
the case that the first CPU in the cpus_allowed mask of a process is
offline. Please consider applying it to your trees.

Thanks!
Regards,
Erich


[-- Attachment #2: migration-fix-2.5.55.patch --]
[-- Type: text/x-diff, Size: 498 bytes --]

diff -urNp linux-2.5.55/kernel/sched.c linux-2.5.55-fix/kernel/sched.c
--- linux-2.5.55/kernel/sched.c	2003-01-09 05:04:22.000000000 +0100
+++ linux-2.5.55-fix/kernel/sched.c	2003-01-10 13:37:40.000000000 +0100
@@ -2108,7 +2108,7 @@ static int migration_thread(void * data)
 		spin_unlock_irqrestore(&rq->lock, flags);
 
 		p = req->task;
-		cpu_dest = __ffs(p->cpus_allowed);
+		cpu_dest = __ffs(p->cpus_allowed & cpu_online_map);
 		rq_dest = cpu_rq(cpu_dest);
 repeat:
 		cpu_src = task_cpu(p);

             reply	other threads:[~2003-01-10 12:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-01-10 12:46 Erich Focht [this message]
2003-01-10 13:11 ` small migration thread fix William Lee Irwin III
2003-01-10 14:29   ` Erich Focht
2003-01-10 15:12     ` William Lee Irwin III

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