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slob: fix lockup in slob_free()

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Don't hold SLOB lock when freeing the page. Reduces lock hold width. See
the following thread for discussion of the bug:

  http://marc.info/?l=linux-kernel&m=123709983214143&w=2

Reported-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Nick Piggin 2009-03-16 21:00:28 +11:00 committed by Pekka Enberg
parent b578f3fcca
commit 6fb8f42439
1 changed files with 2 additions and 1 deletions
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3
mm/slob.c
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@ -393,10 +393,11 @@ static void slob_free(void *block, int size)
/* Go directly to page allocator. Do not pass slob allocator */
if (slob_page_free(sp))
clear_slob_page_free(sp);
spin_unlock_irqrestore(&slob_lock, flags);
clear_slob_page(sp);
free_slob_page(sp);
free_page((unsigned long)b);
goto out;
return;
}
if (!slob_page_free(sp)) {