Roman Pen a67823c1ed percpu-refcount: init ->confirm_switch member properly
This patch targets two things which are related to ->confirm_switch:

 1. Init ->confirm_switch pointer with NULL on percpu_ref_init() or
    kernel frightfully complains with WARN_ON_ONCE(ref->confirm_switch)
    at __percpu_ref_switch_to_atomic if memory chunk was not properly
    zeroed.

 2. Warn if RCU callback is still in progress on percpu_ref_exit().
    The race still exists, because percpu_ref_call_confirm_rcu()
    drops ->confirm_switch to NULL early, but that is only a warning
    and still the caller is responsible that ref is no longer in
    active use.  Hopefully that can help to catch incorrect usage
    of percpu-refcount.

Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
2016-08-11 13:52:23 -04:00
..
2014-10-09 11:35:48 +03:00
2016-07-29 18:30:16 +08:00
2015-11-23 09:44:58 +01:00
2016-03-17 15:09:34 -07:00
2016-02-29 09:35:20 +01:00
2016-02-07 23:17:59 -08:00
2014-04-30 19:49:37 +01:00
2014-08-06 18:01:25 -07:00
2014-05-05 09:09:14 +02:00
2016-01-19 15:26:55 -05:00
2016-05-23 17:04:14 -07:00
2014-08-08 15:57:25 -07:00
2016-03-09 15:43:42 -08:00
2015-02-12 18:54:15 -08:00
2014-06-25 17:45:43 -07:00
2016-04-23 20:13:24 -04:00
2015-09-08 14:35:59 -07:00
2015-02-12 18:54:16 -08:00
2016-07-06 10:51:14 +01:00
2015-03-23 22:12:08 -04:00
2015-06-25 17:00:40 -07:00
2016-03-17 15:09:34 -07:00
2016-05-30 15:26:57 -07:00
2016-08-02 17:31:41 -04:00