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Pull epoll updates from Al Viro:
"Deal with epoll loop check/removal races sanely (among other things).
The solution merged last cycle (pinning a bunch of struct file
instances) had been forced by the wrong data structures; untangling
that takes a bunch of preparations, but it's worth doing - control
flow in there is ridiculously overcomplicated. Memory footprint has
also gone down, while we are at it.
This is not all I want to do in the area, but since I didn't get
around to posting the followups they'll have to wait for the next
cycle"
* 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (27 commits)
epoll: take epitem list out of struct file
epoll: massage the check list insertion
lift rcu_read_lock() into reverse_path_check()
convert ->f_ep_links/->fllink to hlist
ep_insert(): move creation of wakeup source past the fl_ep_links insertion
fold ep_read_events_proc() into the only caller
take the common part of ep_eventpoll_poll() and ep_item_poll() into helper
ep_insert(): we only need tep->mtx around the insertion itself
ep_insert(): don't open-code ep_remove() on failure exits
lift locking/unlocking ep->mtx out of ep_{start,done}_scan()
ep_send_events_proc(): fold into the caller
lift the calls of ep_send_events_proc() into the callers
lift the calls of ep_read_events_proc() into the callers
ep_scan_ready_list(): prepare to splitup
ep_loop_check_proc(): saner calling conventions
get rid of ep_push_nested()
ep_loop_check_proc(): lift pushing the cookie into callers
clean reverse_path_check_proc() a bit
reverse_path_check_proc(): don't bother with cookies
reverse_path_check_proc(): sane arguments
...
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