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authorThomas Gleixner2020-03-13 17:32:17 +0100
committerThomas Gleixner2020-05-19 15:51:20 +0200
commitff5c4f5cad33061b07c3fb9187506783c0f3cb66 (patch)
treea391cabc83847be6d88107ea9a1f95557988013e /kernel/rcu/tree_plugin.h
parent0d00449c7a28a1514595630735df383dec606812 (diff)
rcu/tree: Mark the idle relevant functions noinstr
These functions are invoked from context tracking and other places in the low level entry code. Move them into the .noinstr.text section to exclude them from instrumentation. Mark the places which are safe to invoke traceable functions with instrumentation_begin/end() so objtool won't complain. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lkml.kernel.org/r/20200505134100.575356107@linutronix.de
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
-rw-r--r--kernel/rcu/tree_plugin.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 50caa3fcbad2..352223664ebd 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2539,7 +2539,7 @@ static void rcu_bind_gp_kthread(void)
}
/* Record the current task on dyntick-idle entry. */
-static void rcu_dynticks_task_enter(void)
+static void noinstr rcu_dynticks_task_enter(void)
{
#if defined(CONFIG_TASKS_RCU) && defined(CONFIG_NO_HZ_FULL)
WRITE_ONCE(current->rcu_tasks_idle_cpu, smp_processor_id());
@@ -2547,7 +2547,7 @@ static void rcu_dynticks_task_enter(void)
}
/* Record no current task on dyntick-idle exit. */
-static void rcu_dynticks_task_exit(void)
+static void noinstr rcu_dynticks_task_exit(void)
{
#if defined(CONFIG_TASKS_RCU) && defined(CONFIG_NO_HZ_FULL)
WRITE_ONCE(current->rcu_tasks_idle_cpu, -1);