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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-10-31 00:59:01 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-12-07 17:01:31 -0800
commit7c9906ca5e582a773fff696975e312cef58a7386 (patch)
tree1155e2ed10709b9d3efa87b2f4b826cc886e84eb /include/linux/rcupdate.h
parentd117c8aa1d511f76401337620b9c4ffb4c886579 (diff)
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/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index a0189ba67fde..f2b667df1131 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -379,9 +379,9 @@ static inline void rcu_init_nohz(void)
*/
#define RCU_NONIDLE(a) \
do { \
- rcu_irq_enter(); \
+ rcu_irq_enter_irqson(); \
do { a; } while (0); \
- rcu_irq_exit(); \
+ rcu_irq_exit_irqson(); \
} while (0)
/*