tree 827bd2588c2b73d11cea6869de8ff42dba134375
parent 4a6dae6d382e9edf3ff440b819e554ed706359bc
author Nick Piggin <nickpiggin@yahoo.com.au> 1131926845 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1131934456 -0800

[PATCH] atomic: inc_not_zero

Introduce an atomic_inc_not_zero operation.  Make this a special case of
atomic_add_unless because lockless pagecache actually wants
atomic_inc_not_negativeone due to its offset refcount.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>