rcu: Remove full memory barrier on RCU stall printout

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RCU stall printout fetches the EQS state of a CPU with a preceding full
memory barrier. However there is nothing to order this read against at
this debugging stage. It is inherently racy when performed remotely.

Do a plain read instead.

This was the last user of rcu_dynticks_snap().

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

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Frederic Weisbecker 2024-05-15 14:53:31 +02:00 • committed by Paul E. McKenney

parent e7a3c8ea6e

commit 55911a9f42

2 changed files with 2 additions and 12 deletions

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10

kernel/rcu/tree.c

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4

kernel/rcu/tree_stall.h

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