On Sat, Jan 28, 2017 at 06:42:20AM -0600, Douglas Miller wrote:

percpu_ref_tryget() and percpu_ref_tryget_live() should return
"true" IFF they acquire a reference. But the return value from
atomic_long_inc_not_zero() is a long and may have high bits set,
e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines
is bool so the reference may actually be acquired but the routines
return "false" which results in a reference leak since the caller
assumes it does not need to do a corresponding percpu_ref_put().

Applied to percpu/for-4.10-fixes w/ stable cc'd.

Thanks!

-- 
tejun