kvfree_rcu: Make krc_this_cpu_unlock() use raw_spin_unlock_irqrestore()

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The krc_this_cpu_unlock() function does a raw_spin_unlock() immediately
followed by a local_irq_restore().  This commit saves a line of code by
merging them into a raw_spin_unlock_irqrestore().  This transformation
also reduces scheduling latency because raw_spin_unlock_irqrestore()
responds immediately to a reschedule request.  In contrast,
local_irq_restore() does a scheduling-oblivious enabling of interrupts.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2021-01-20 13:38:08 -08:00

parent b01b405092

commit 7ffc9ec8ea

1 changed files with 1 additions and 2 deletions

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kernel/rcu/tree.c

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