linux-kernel - [PATCH 0/8] rcu: Ensure rcu read site is deadlock-immunity

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Date:	Wed, 7 Aug 2013 18:24:56 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 0/8] rcu: Ensure rcu read site is deadlock-immunity

Although all articles declare that rcu read site is deadlock-immunity.
It is not true for rcu-preempt, it will be deadlock if rcu read site
overlaps with scheduler lock.

ec433f0c, 10f39bb1 and 016a8d5b just partially solve it. But rcu read site
is still not deadlock-immunity. And the problem described in 016a8d5b
is still existed(rcu_read_unlock_special() calls wake_up).

The problem is fixed in patch5.

Lai Jiangshan (8):
  rcu: add a warn to rcu_preempt_note_context_switch()
  rcu: rcu_read_unlock_special() can be nested in irq/softirq 10f39bb1
  rcu: keep irqs disabled in rcu_read_unlock_special()
  rcu: delay task rcu state cleanup in exit_rcu()
  rcu: eliminate rcu read site deadlock
  rcu: call rcu_read_unlock_special() in rcu_preempt_check_callbacks()
  rcu: add # of deferred _special() statistics
  rcu: remove irq work for rsp_wakeup()

 include/linux/rcupdate.h |    2 +-
 kernel/rcupdate.c        |    2 +-
 kernel/rcutree.c         |   17 +--------
 kernel/rcutree.h         |    2 +-
 kernel/rcutree_plugin.h  |   82 ++++++++++++++++++++++++++++++++++-----------
 kernel/rcutree_trace.c   |    1 +
 6 files changed, 68 insertions(+), 38 deletions(-)

-- 
1.7.4.4

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