diff options
| 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 /fs | |
| parent | rcu: Make cpu_needs_another_gp() be bool (diff) | |
| download | linux-dev-7c9906ca5e582a773fff696975e312cef58a7386.tar.xz linux-dev-7c9906ca5e582a773fff696975e312cef58a7386.zip | |
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 'fs')
0 files changed, 0 insertions, 0 deletions