From dcd42591ebb8a25895b551a5297ea9c24414ba54 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <frederic@kernel.org>
Date: Fri, 13 Nov 2020 13:13:33 +0100
Subject: timer: Add timer_curr_running()

This commit adds a timer_curr_running() function that verifies that the
current code is running in the context of the specified timer's handler.

Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 kernel/time/timer.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'kernel/time')

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 8dbc008f8942..f9b2096456e5 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1237,6 +1237,19 @@ int try_to_del_timer_sync(struct timer_list *timer)
 }
 EXPORT_SYMBOL(try_to_del_timer_sync);
 
+bool timer_curr_running(struct timer_list *timer)
+{
+	int i;
+
+	for (i = 0; i < NR_BASES; i++) {
+		struct timer_base *base = this_cpu_ptr(&timer_bases[i]);
+		if (base->running_timer == timer)
+			return true;
+	}
+
+	return false;
+}
+
 #ifdef CONFIG_PREEMPT_RT
 static __init void timer_base_init_expiry_lock(struct timer_base *base)
 {
-- 
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