percpu-refcount: implement percpu_ref_tryget()

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Implement percpu_ref_tryget() which fails if the refcnt already
reached zero.  Note that this is different from the recently renamed
percpu_ref_tryget_live() which fails if the refcnt has been killed and
is draining the remaining references.  percpu_ref_tryget() succeeds on
a killed refcnt as long as its current refcnt is above zero.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Kent Overstreet <kmo@daterainc.com>

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Tejun Heo 2014-05-09 15:11:53 -04:00

parent 2070d50e1c

commit 4fb6e25049

1 changed files with 32 additions and 0 deletions

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include/linux/percpu-refcount.h

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