rcu: Let dump_cpu_task() be used without preemption disabled

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The commit 2d7f00b2f0 ("rcu: Suppress smp_processor_id() complaint
in synchronize_rcu_expedited_wait()") disabled preemption around
dump_cpu_task() to suppress warning on its usage within preemtible context.

Calling dump_cpu_task() doesn't required to be in non-preemptible context
except for suppressing the smp_processor_id() warning.
As the smp_processor_id() is evaluated along with in_hardirq()
to check if it's in interrupt context, this patch removes the need
for its preemtion disablement by reordering the condition so that
smp_processor_id() only gets evaluated when it's in interrupt context.

Signed-off-by: Ryo Takakura <takakura@valinux.co.jp>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

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Ryo Takakura 2024-06-28 13:18:26 +09:00 • committed by Neeraj Upadhyay

parent 7c72dedb00

commit 51b739990c

2 changed files with 1 additions and 3 deletions

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2

kernel/rcu/tree_exp.h

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2

kernel/sched/core.c

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