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authorPaul E. McKenney <paulmck@us.ibm.com>2006-09-29 11:00:11 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 18:18:13 +0200
commita45bce49545739a940f8bd4ca85c3b7435564893 (patch)
tree3f558e487448db9e49c8d4cd36379d9f42f93da2 /CREDITS
parent[PATCH] lockdep: print kernel version (diff)
downloadlinux-a45bce49545739a940f8bd4ca85c3b7435564893.tar.xz
linux-a45bce49545739a940f8bd4ca85c3b7435564893.zip
[PATCH] memory ordering in __kfifo primitives
Both __kfifo_put() and __kfifo_get() have header comments stating that if there is but one concurrent reader and one concurrent writer, locking is not necessary. This is almost the case, but a couple of memory barriers are needed. Another option would be to change the header comments to remove the bit about locking not being needed, and to change the those callers who currently don't use locking to add the required locking. The attachment analyzes this approach, but the patch below seems simpler. Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com> Cc: Stelian Pop <stelian@popies.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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