[PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit()

From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit()
Date	2017-07-24 23:50 +0200
Message-ID	<u6ToK-2fn-5@gated-at.bofh.it> (permalink)
References	<u6ToJ-2fn-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Masami Hiramatsu <mhiramat@kernel.org>

Set disable_rcu_irq_enter on not only rcu_eqs_enter_common() but also
rcu_eqs_exit(), since rcu_eqs_exit() suffers from the same issue as was
fixed for rcu_eqs_enter_common() by commit 03ecd3f48e57 ("rcu/tracing:
Add rcu_disabled to denote when rcu_irq_enter() will not work").

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 7e018696fd82..913c90eccd4d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -955,8 +955,10 @@ static void rcu_eqs_exit(bool user)
 	if (oldval & DYNTICK_TASK_NEST_MASK) {
 		rdtp->dynticks_nesting += DYNTICK_TASK_NEST_VALUE;
 	} else {
+		__this_cpu_inc(disable_rcu_irq_enter);
 		rdtp->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
 		rcu_eqs_exit_common(oldval, user);
+		__this_cpu_dec(disable_rcu_irq_enter);
 	}
 }
 
-- 
2.5.2

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[PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-24 23:50 +0200

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