Re: [PATCH 2/2] mutex: use spin_[un]lock instead of arch_spin_[un]lock

[Ingo Molnar <mingo@kernel.org>]

* Yuanhan Liu <yuanhan.liu@linux.intel.com> wrote:

> Use spin_[un]lock instead of arch_spin_[un]lock in mutex-debug.h so
> that we can collect the lock statistics of spin_lock_mutex from
> /proc/lock_stat.
> 
> Cc: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
> ---
>  kernel/mutex-debug.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/mutex-debug.h b/kernel/mutex-debug.h
> index 0799fd3..556c0bc 100644
> --- a/kernel/mutex-debug.h
> +++ b/kernel/mutex-debug.h
> @@ -43,13 +43,13 @@ static inline void mutex_clear_owner(struct mutex *lock)
>  							\
>  		DEBUG_LOCKS_WARN_ON(in_interrupt());	\
>  		local_irq_save(flags);			\
> -		arch_spin_lock(&(lock)->rlock.raw_lock);\
> +		spin_lock(lock);			\

But in that case it could probably use the spin_lock_irqsave() 
primitive, right?

>  		DEBUG_LOCKS_WARN_ON(l->magic != l);	\
>  	} while (0)
>  
>  #define spin_unlock_mutex(lock, flags)				\
>  	do {							\
> -		arch_spin_unlock(&(lock)->rlock.raw_lock);	\
> +		spin_unlock(lock);				\
>  		local_irq_restore(flags);			\
>  		preempt_check_resched();			\

And here spin_unlock_irqrestore().

Thanks,

	Ingo