[tip:smp/hotplug] cpu/hotplug: Provide lockdep_assert_cpus_held()

[tip-bot for Thomas Gleixner]

Commit-ID:  ade3f680a76b474d9f5375a9b1d100ee787bf469
Gitweb:     http://git.kernel.org/tip/ade3f680a76b474d9f5375a9b1d100ee787bf469
Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 24 May 2017 10:15:13 +0200
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 26 May 2017 10:10:35 +0200

cpu/hotplug: Provide lockdep_assert_cpus_held()

Provide a stub function which can be used in places where existing
get_online_cpus() calls are moved to call sites.

This stub is going to be filled by the final conversion of the hotplug
locking mechanism to a percpu rwsem.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170524081547.161282442@xxxxxxxxxxxxx

---
 include/linux/cpu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 0558760..af4d660 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -103,6 +103,7 @@ extern void cpus_write_lock(void);
 extern void cpus_write_unlock(void);
 extern void cpus_read_lock(void);
 extern void cpus_read_unlock(void);
+static inline void lockdep_assert_cpus_held(void) { }
 extern void cpu_hotplug_disable(void);
 extern void cpu_hotplug_enable(void);
 void clear_tasks_mm_cpumask(int cpu);
@@ -114,6 +115,7 @@ static inline void cpus_write_lock(void) { }
 static inline void cpus_write_unlock(void) { }
 static inline void cpus_read_lock(void) { }
 static inline void cpus_read_unlock(void) { }
+static inline void lockdep_assert_cpus_held(void) { }
 static inline void cpu_hotplug_disable(void) { }
 static inline void cpu_hotplug_enable(void) { }
 #endif	/* !CONFIG_HOTPLUG_CPU */