On Sun, Dec 20, 2020 at 03:39:23PM +0000, guoren@kernel.org wrote:

From: Guo Ren <redacted>

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.