• Paul E. McKenney's avatar
    rcu: Don't redundantly disable irqs in rcu_irq_{enter,exit}() · 7c9906ca
    Paul E. McKenney authored
    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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    7c9906ca
tracepoint.h 16 KB