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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-10-31 10:59:01 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-12-08 04:01:31 +0300
commit7c9906ca5e582a773fff696975e312cef58a7386 (patch)
tree1155e2ed10709b9d3efa87b2f4b826cc886e84eb /include/linux/rcutree.h
parentd117c8aa1d511f76401337620b9c4ffb4c886579 (diff)
downloadlinux-7c9906ca5e582a773fff696975e312cef58a7386.tar.xz
rcu: Don't redundantly disable irqs in rcu_irq_{enter,exit}()
This commit replaces a local_irq_save()/local_irq_restore() pair with a lockdep assertion that interrupts are already disabled. This should remove the corresponding overhead from the interrupt entry/exit fastpaths. This change was inspired by the fact that Iftekhar Ahmed's mutation testing showed that removing rcu_irq_enter()'s call to local_ird_restore() had no effect, which might indicate that interrupts were always enabled anyway. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcutree.h')
-rw-r--r--include/linux/rcutree.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 9d3eda39bcd2..ad1eda9fa4da 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -97,6 +97,8 @@ void rcu_idle_enter(void);
void rcu_idle_exit(void);
void rcu_irq_enter(void);
void rcu_irq_exit(void);
+void rcu_irq_enter_irqson(void);
+void rcu_irq_exit_irqson(void);
void exit_rcu(void);