rcutorture: Make {,s}rcu_read_delay() better handle forward-progress testing

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The rcu_read_delay() and srcu_read_delay() functions are suppose to
avoid (or at least to minimize) read-side delays during call_rcu()-based
forward-progress testing.  Although rcu_read_delay() does account for
this by testing rcu_fwd_cb_nodelay, it only does so in some cases, and
srcu_read_delay() does not bother at all.  And rcutorture testing does
occasionally turn up the MIN_FWD_CBS_LAUNDERED failure when running
forward-progress tests on Tree SRCU flavors.

This commit therefore makes both rcu_read_delay() and srcu_read_delay()
take an immediate exit if rcu_fwd_cb_nodelay is set.

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

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This commit is contained in:

Paul E. McKenney 2026-07-28 14:58:49 -07:00

parent 6c22d64011

commit 20ed97cfde

1 changed files with 11 additions and 5 deletions

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kernel/rcu/rcutorture.c

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