linux-kernel - Re: There is something with scheduler (was Re: [patch] Re: [regression bisect -next] BUG: using smp_processor_id() in preemptible [00000000] code: rmmod)

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Date:	Thu, 05 Nov 2009 15:30:37 +0100
From:	Mike Galbraith <efault@....de>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	hpa@...or.com, tglx@...utronix.de
Subject: Re: There is something with scheduler (was Re: [patch] Re:
 [regression bisect -next] BUG: using smp_processor_id() in preemptible
 [00000000] code: rmmod)

BTW, with (only) the full scheduler pull request applied, it also acts
sane, and this little hunk is responsible... somehow.  But if that's the
problem, why does locking the runqueue fix it too??

Index: linux-2.6.32.git/kernel/sched.c
===================================================================
--- linux-2.6.32.git.orig/kernel/sched.c
+++ linux-2.6.32.git/kernel/sched.c
@@ -9552,13 +9584,13 @@ void __init sched_init(void)
 	current->sched_class = &fair_sched_class;
 
 	/* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
-	alloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
 #ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ
-	alloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
 	alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
 #endif
-	alloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
+	zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
 #endif /* SMP */
 
 	perf_event_init();


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