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authorNick Piggin <npiggin@suse.de>2007-11-26 14:58:10 -0600
committerDave Kleikamp <shaggy@linux.vnet.ibm.com>2008-01-03 13:11:44 -0600
commit54af6233d1cb84cdfaa6ea44ea0db0bcf518baac (patch)
tree031f07f853e18e2fe09b054a3a8e432424362e60 /fs/jfs/jfs_dtree.c
parent67e6682f18b3bf812a994ae027ff87174a297ae8 (diff)
downloadlinux-54af6233d1cb84cdfaa6ea44ea0db0bcf518baac.tar.bz2
JFS is missing a memory barrier
JFS is missing a memory barrier needed to close the critical section before clearing the lock bit. Use lock bitops for this. unlock_page() has a second barrier after clearing the lock, which is required because it checks whether the waitqueue is active without locks. Such a barrier is not required here because the waitqueue spinlock is always taken (something to think about if performance is an issue). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Diffstat (limited to 'fs/jfs/jfs_dtree.c')
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