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由 Tejun Heo 提交于
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: NTejun Heo <tj@kernel.org> Acked-by: NKent Overstreet <kmo@daterainc.com>
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