Re: [PATCH v2 5/5] csky: Cleanup asm/spinlock.h

[Peter Zijlstra]

On Sun, Dec 20, 2020 at 03:39:23PM +0000, guoren@xxxxxxxxxx wrote:
> From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
> 
> There are two implementation of spinlock in arch/csky:
>  - simple one (NR_CPU = 1,2)
>  - tick's one (NR_CPU = 3,4)
> Remove the simple one.
> 
> There is already smp_mb in spinlock, so remove the definition of
> smp_mb__after_spinlock.

Where ? Note that with qspinlock the fast path is
atomic_try_cmpxchg_acquire(), which does not imply anything of the sort.