diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2024-10-09 11:00:41 -0700 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2024-11-12 21:44:24 +0100 |
| commit | 481aa5fca02a2ee85ca76571becca31f816c2420 (patch) | |
| tree | e9b44ea209194470cb44f0395eca1b5de36a27e0 /kernel | |
| parent | 4fa7f729cecf4aee3cad8218b006b476f0ff90f4 (diff) | |
rcu: Allow short-circuiting of synchronize_rcu_tasks_rude()
There are now architectures for which all deep-idle and entry-exit
functions are properly inlined or marked noinstr. Such architectures do
not need synchronize_rcu_tasks_rude(), or will not once RCU Tasks has
been modified to pay attention to idle tasks. This commit therefore
allows a CONFIG_ARCH_HAS_NOINSTR_MARKINGS Kconfig option to turn
synchronize_rcu_tasks_rude() into a no-op.
To facilitate testing, kernels built by rcutorture scripting will enable
RCU Tasks Trace even on systems that do not need it.
[ paulmck: Apply Peter Zijlstra feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcu/tasks.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 6333f4ccf024..dd9730fd44fb 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1398,7 +1398,8 @@ static void call_rcu_tasks_rude(struct rcu_head *rhp, rcu_callback_t func) */ void synchronize_rcu_tasks_rude(void) { - synchronize_rcu_tasks_generic(&rcu_tasks_rude); + if (!IS_ENABLED(CONFIG_ARCH_WANTS_NO_INSTR) || IS_ENABLED(CONFIG_FORCE_TASKS_RUDE_RCU)) + synchronize_rcu_tasks_generic(&rcu_tasks_rude); } EXPORT_SYMBOL_GPL(synchronize_rcu_tasks_rude); |