Commit e5e5673f authored Jan 10, 2007 by Nathan Lynch Committed by Linus Torvalds Jan 11, 2007

[PATCH] sched: tasks cannot run on cpus onlined after boot

Commit 5c1e1767 ("sched: force /sbin/init
off isolated cpus") sets init's cpus_allowed to a subset of cpu_online_map
at boot time, which means that tasks won't be scheduled on cpus that are
added to the system later.

Make init's cpus_allowed a subset of cpu_possible_map instead.  This should
still preserve the behavior that Nick's change intended.

Thanks to Giuliano Pochini for reporting this and testing the fix:

http://ozlabs.org/pipermail/linuxppc-dev/2006-December/029397.html



Signed-off-by: Nathan Lynch <ntl@pobox.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent c71551ad

kernel/sched.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -6865,7 +6865,7 @@ void __init sched_init_smp(void)

		lock_cpu_hotplug();
		arch_init_sched_domains(&cpu_online_map);
		cpus_andnot(non_isolated_cpus, cpu_online_map, cpu_isolated_map);
		cpus_andnot(non_isolated_cpus, cpu_possible_map, cpu_isolated_map);
		if (cpus_empty(non_isolated_cpus))
		cpu_set(smp_processor_id(), non_isolated_cpus);
		unlock_cpu_hotplug();

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