rcu: Suppress smp_processor_id() complaint in synchronize_rcu_expedited_wait()

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The normal grace period's RCU CPU stall warnings are invoked from the
scheduling-clock interrupt handler, and can thus invoke smp_processor_id()
with impunity, which allows them to directly invoke dump_cpu_task().
In contrast, the expedited grace period's RCU CPU stall warnings are
invoked from process context, which causes the dump_cpu_task() function's
calls to smp_processor_id() to complain bitterly in debug kernels.

This commit therefore causes synchronize_rcu_expedited_wait() to disable
preemption around its call to dump_cpu_task().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Paul E. McKenney 2022-12-16 15:55:48 -08:00 • committed by Greg Kroah-Hartman

parent 4a501b4ef8

commit 05737bd85c

1 changed files with 2 additions and 0 deletions

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kernel/rcu/tree_exp.h

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