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authorPeter Zijlstra <peterz@infradead.org>2009-08-10 12:33:05 +0100
committerIngo Molnar <mingo@elte.hu>2009-08-10 14:43:09 +0200
commit2fc391112fb6f3424435a3aa2fda887497b5f807 (patch)
tree89cda7002d591807536dca68b6344a558b081428 /kernel/futex_compat.c
parentbeda2c7ea2c15ed01eef00a997d2b0496c3a502d (diff)
downloadlinux-2fc391112fb6f3424435a3aa2fda887497b5f807.tar.bz2
locking, sched: Give waitqueue spinlocks their own lockdep classes
Give waitqueue spinlocks their own lockdep classes when they are initialised from init_waitqueue_head(). This means that struct wait_queue::func functions can operate other waitqueues. This is used by CacheFiles to catch the page from a backing fs being unlocked and to wake up another thread to take a copy of it. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Takashi Iwai <tiwai@suse.de> Cc: linux-cachefs@redhat.com Cc: torvalds@osdl.org Cc: akpm@linux-foundation.org LKML-Reference: <20090810113305.17284.81508.stgit@warthog.procyon.org.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/futex_compat.c')
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