On Wed, Mar 22, 2017 at 11:00:29AM -0400, Tejun Heo wrote: > On Wed, Mar 22, 2017 at 12:50:12PM +1100, NeilBrown wrote: > > > > percpu_ref_switch_to_atomic_sync() schedules the switch > > to atomic mode, then waits for it to complete. > > > > Also export percpu_ref_switch_to_* so they can be used from modules. > > > > This will be used in md/raid to count the number of pending write > > requests to an array. > > We occasionally need to check if the count is zero, but most often > > we don't care. > > We always want updates to the counter to be fast, as in some cases > > we count every 4K page. > > > > Signed-off-by: NeilBrown <ne...@suse.com> > > Acked-by: Tejun Heo <t...@kernel.org> > > Please feel free to route through other patches through md tree. If > preferable, I can route it through percpu/for-4.12.
Thanks, Tejun. I applied it to md tree, that will avoid a lot of troubles. Thanks, Shaohua
