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authorFrederic Weisbecker <frederic@kernel.org>2020-11-11 23:53:13 +0100
committerPaul E. McKenney <paulmck@kernel.org>2021-01-06 16:24:59 -0800
commit43759fe5a137389e94ed6d4680c3c63c17273158 (patch)
treee0fe88f37d34afdc28d8bd4094ceb42af195c1a8
parent634954c2dbf88e67aa267798f60af6b9a476cf4b (diff)
cpu/hotplug: Add lockdep_is_cpus_held()
This commit adds a lockdep_is_cpus_held() function to verify that the proper locks are held and that various operations are running in the correct context. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Paul E. McKenney <paulmck@kernel.org> 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> Cc: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
-rw-r--r--include/linux/cpu.h2
-rw-r--r--kernel/cpu.c7
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index d6428aaf67e7..3aaa0687e8df 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -111,6 +111,8 @@ static inline void cpu_maps_update_done(void)
#endif /* CONFIG_SMP */
extern struct bus_type cpu_subsys;
+extern int lockdep_is_cpus_held(void);
+
#ifdef CONFIG_HOTPLUG_CPU
extern void cpus_write_lock(void);
extern void cpus_write_unlock(void);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 4e11e91010e1..1b6302ecbabe 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -330,6 +330,13 @@ void lockdep_assert_cpus_held(void)
percpu_rwsem_assert_held(&cpu_hotplug_lock);
}
+#ifdef CONFIG_LOCKDEP
+int lockdep_is_cpus_held(void)
+{
+ return percpu_rwsem_is_held(&cpu_hotplug_lock);
+}
+#endif
+
static void lockdep_acquire_cpus_lock(void)
{
rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 0, _THIS_IP_);