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| author | Frederic Weisbecker <frederic@kernel.org> | 2022-02-16 18:42:06 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-12 03:05:58 +0300 |
| commit | 2eed973adc6e749439730e53e6220b122398d319 (patch) | |
| tree | 5b4ec105e89f95eac714ff3e2dbb54eadb69204b /kernel/rcu | |
| parent | 8d2aaa9b7c290e766a41f29c71ec72192851d538 (diff) | |
| download | linux-2eed973adc6e749439730e53e6220b122398d319.tar.xz | |
rcu: Assume rcu_init() is called before smp
The rcu_init() function is called way before SMP is initialized and
therefore only the boot CPU should be online at this stage.
Simplify the boot per-cpu initialization accordingly.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a4b8189455d5..e6a9e5744e45 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4782,7 +4782,7 @@ static void __init kfree_rcu_batch_init(void) void __init rcu_init(void) { - int cpu; + int cpu = smp_processor_id(); rcu_early_boot_tests(); @@ -4802,11 +4802,10 @@ void __init rcu_init(void) * or the scheduler are operational. */ pm_notifier(rcu_pm_notify, 0); - for_each_online_cpu(cpu) { - rcutree_prepare_cpu(cpu); - rcu_cpu_starting(cpu); - rcutree_online_cpu(cpu); - } + WARN_ON(num_online_cpus() > 1); // Only one CPU this early in boot. + rcutree_prepare_cpu(cpu); + rcu_cpu_starting(cpu); + rcutree_online_cpu(cpu); /* Create workqueue for Tree SRCU and for expedited GPs. */ rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_MEM_RECLAIM, 0); |