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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2014-02-06 12:04:28 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-20 10:45:32 -0800
commitd89985cb8cf57e6e444ee4ddf48cec39d0f28b1c (patch)
tree3cbb095f153ad38b85a1cf4606e166a4a270c893 /lib
parent4d4bed8141f7883dfbed44749653f769367b3e01 (diff)
mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq
commit 227d53b397a32a7614667b3ecaf1d89902fb6c12 upstream. To use spin_{un}lock_irq is dangerous if caller disabled interrupt. During aio buffer migration, we have a possibility to see the following call stack. aio_migratepage [disable interrupt] migrate_page_copy clear_page_dirty_for_io set_page_dirty __set_page_dirty_buffers __set_page_dirty spin_lock_irq This mean, current aio migration is a deadlockable. spin_lock_irqsave is a safer alternative and we should use it. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reported-by: David Rientjes rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions