rcu: Allow rcu_read_unlock_special() to raise_softirq() if in_irq()

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When running in an interrupt handler, raise_softirq() and
raise_softirq_irqoff() have extremely low overhead: They simply set a
bit in a per-CPU mask, which is checked upon exit from that interrupt
handler.  Therefore, if rcu_read_unlock_special() is invoked within an
interrupt handler and RCU_SOFTIRQ is in use, this commit make use of
raise_softirq_irqoff() even if there is no expedited grace period in
flight and even if this is not a nohz_full CPU.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

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Paul E. McKenney 2019-04-01 15:12:47 -07:00

parent 25102de65f

commit 385b599e8c

1 changed files with 1 additions and 1 deletions

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kernel/rcu/tree_plugin.h

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