sched/numa: Fix task_numa_free() lockdep splat

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Sasha reported that lockdep claims that the following commit:
made numa_group.lock interrupt unsafe:

  156654f491 ("sched/numa: Move task_numa_free() to __put_task_struct()")

While I don't see how that could be, given the commit in question moved
task_numa_free() from one irq enabled region to another, the below does
make both gripes and lockups upon gripe with numa=fake=4 go away.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Fixes: 156654f491 ("sched/numa: Move task_numa_free() to __put_task_struct()")
Signed-off-by: Mike Galbraith <bitbucket@online.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: torvalds@linux-foundation.org
Cc: mgorman@suse.com
Cc: akpm@linux-foundation.org
Cc: Dave Jones <davej@redhat.com>
Link: http://lkml.kernel.org/r/1396860915.5170.5.camel@marge.simpson.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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This commit is contained in:

Mike Galbraith 2014-04-07 10:55:15 +02:00 • committed by Ingo Molnar

parent 467cbd207a

commit 60e69eed85

2 changed files with 16 additions and 6 deletions

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13

kernel/sched/fair.c

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9

kernel/sched/sched.h

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