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| author | Frederic Weisbecker <frederic@kernel.org> | 2023-10-27 16:40:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-10 17:16:56 +0100 |
| commit | 547c59c83abfc2abfae20262cf30d14c9e73f350 (patch) | |
| tree | 29dbd9be8426a92321411aecf6646353b83f0d6d /kernel/rcu/tree.c | |
| parent | 39d04e558882ca317c5e64cc99c2a03494047257 (diff) | |
| download | linux-547c59c83abfc2abfae20262cf30d14c9e73f350.tar.gz linux-547c59c83abfc2abfae20262cf30d14c9e73f350.tar.bz2 linux-547c59c83abfc2abfae20262cf30d14c9e73f350.zip | |
rcu: Introduce rcu_cpu_online()
[ Upstream commit 2be4686d866ad5896f2bb94d82fe892197aea9c7 ]
Export the RCU point of view as to when a CPU is considered offline
(ie: when does RCU consider that a CPU is sufficiently down in the
hotplug process to not feature any possible read side).
This will be used by RCU-tasks whose vision of an offline CPU should
reasonably match the one of RCU core.
Fixes: cff9b2332ab7 ("kernel/sched: Modify initial boot task idle setup")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 92a090e16186..9af42eae1ba3 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4139,6 +4139,13 @@ static bool rcu_rdp_cpu_online(struct rcu_data *rdp) return !!(rdp->grpmask & rcu_rnp_online_cpus(rdp->mynode)); } +bool rcu_cpu_online(int cpu) +{ + struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); + + return rcu_rdp_cpu_online(rdp); +} + #if defined(CONFIG_PROVE_RCU) && defined(CONFIG_HOTPLUG_CPU) /* |