]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
Lockdep treats down_write_trylock like regular down_write
authorPavel Emelianov <xemul@sw.ru>
Tue, 8 May 2007 07:29:10 +0000 (00:29 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 8 May 2007 18:15:09 +0000 (11:15 -0700)
commit428e6ce023c5890cfecc8ad10335da3f28dbf893
tree17c746035cf727bc5494b9116ae6034724aaede3
parent644fd4f5de9ca147daeb6dc5f844b44ec3d58b47
Lockdep treats down_write_trylock like regular down_write

This causes constructions like

down_write(&mm1->mmap_sem);
if (down_write_trylock(&mm2->mmap_sem)) {
       ...
       up_write(&mm2->mmap_sem);
}
up_write(&mm1->mmap_sem);

generate a lockdep warning about circular locking dependence.

Call rwsem_acquire() with trylock set to 1.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/rwsem.c