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authorTejun Heo <tj@kernel.org>2014-09-24 13:31:49 -0400
committerTejun Heo <tj@kernel.org>2014-09-24 13:31:49 -0400
commitf47ad45784611297b699f3dffb6c7222b76afe64 (patch)
tree9497c0a4bad4c6b97cfd08bf22a8b2313606ce6a /lib/locking-selftest-rlock-hardirq.h
parent490c79a65708873228cf114cf00e32c204e4e907 (diff)
percpu_ref: decouple switching to percpu mode and reinit
percpu_ref has treated the dropping of the base reference and switching to atomic mode as an integral operation; however, there's nothing inherent tying the two together. The use cases for percpu_ref have been expanding continuously. While the current init/kill/reinit/exit model can cover a lot, the coupling of kill/reinit with atomic/percpu mode switching is turning out to be too restrictive for use cases where many percpu_refs are created and destroyed back-to-back with only some of them reaching extended operation. The coupling also makes implementing always-atomic debug mode difficult. This patch separates out percpu mode switching into percpu_ref_switch_to_percpu() and reimplements percpu_ref_reinit() on top of it. * DEAD still requires ATOMIC. A dead ref can't be switched to percpu mode w/o going through reinit. v2: __percpu_ref_switch_to_percpu() was missing static. Fixed. Reported by Fengguang aka kbuild test robot. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Kent Overstreet <kmo@daterainc.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: kbuild test robot <fengguang.wu@intel.com>
Diffstat (limited to 'lib/locking-selftest-rlock-hardirq.h')
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