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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/rcutiny.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/rcutiny.h')
-rw-r--r--include/linux/rcutiny.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 4c1aaf9cce7b..64809aea661c 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -181,6 +181,14 @@ static inline void rcu_irq_enter(void)
{
}
+static inline void rcu_irq_exit_irqson(void)
+{
+}
+
+static inline void rcu_irq_enter_irqson(void)
+{
+}
+
static inline void rcu_irq_exit(void)
{
}