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

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Date:   Thu, 7 Jan 2021 13:45:32 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     guoren@...nel.org
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, linux-arch@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH v2 5/5] csky: Cleanup asm/spinlock.h

On Sun, Dec 20, 2020 at 03:39:23PM +0000, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> 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.