Re: [patch V3 02/32] cpu/hotplug: Provide lockdep_assert_cpus_held()

[Paul E. McKenney]

On Wed, May 24, 2017 at 10:15:13AM +0200, Thomas Gleixner wrote:
> 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>

Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>

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