linux-kernel - Re: [PATCH v2 1/5] csky: Remove custom asm/atomic.h implementation

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Message-ID: <X/buKPr5OCH3C32J@hirez.programming.kicks-ass.net>
Date:   Thu, 7 Jan 2021 12:19:04 +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>,
        Arnd Bergmann <arnd@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH v2 1/5] csky: Remove custom asm/atomic.h implementation

On Sun, Dec 20, 2020 at 03:39:19PM +0000, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> Use generic atomic implementation based on cmpxchg. So remove csky
> asm/atomic.h.

Clarification would be good. Typically cmpxchg() loops perform
sub-optimal on LL/SC architectures, due to the double loop construction.