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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-10-31 00:59:01 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-12-07 17:01:31 -0800 |
| commit | 7c9906ca5e582a773fff696975e312cef58a7386 (patch) | |
| tree | 1155e2ed10709b9d3efa87b2f4b826cc886e84eb /include/linux/rcupdate.h | |
| parent | d117c8aa1d511f76401337620b9c4ffb4c886579 (diff) | |
| download | linux-7c9906ca5e582a773fff696975e312cef58a7386.tar.gz linux-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/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 4 |
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) /* |