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bpf: Retire rcu_trace_implies_rcu_gp()

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RCU Tasks Trace grace period implies RCU grace period, and this
guarantee is expected to remain in the future. Only BPF is the user of
this predicate, hence retire the API and clean up all in-tree users.

RCU Tasks Trace is now implemented on SRCU-fast and its grace period
mechanism always has at least one call to synchronize_rcu() as it is
required for SRCU-fast's correctness (it replaces the smp_mb() that
SRCU-fast readers skip). So, RCU-tt GP will always imply RCU GP.

Reviewed-by: Puranjay Mohan <puranjay@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260407162234.785270-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi
2026-04-07 18:22:33 +02:00
committed by Alexei Starovoitov
parent a8aa306741
commit 57b23c0f61
5 changed files with 19 additions and 60 deletions
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2
kernel/bpf/helpers.c
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@@ -1272,7 +1272,7 @@ static void bpf_async_cb_rcu_tasks_trace_free(struct rcu_head *rcu)
return;
}
/* rcu_trace_implies_rcu_gp() is true and will remain so */
/* RCU Tasks Trace grace period implies RCU grace period. */
bpf_async_cb_rcu_free(rcu);
}