linux-kernel - Re: [RFC PATCH 3/5] asm-generic/bitops/atomic.h: Rewrite using atomic_fetch

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Message-ID: <20180219140553.GT25201@hirez.programming.kicks-ass.net>
Date:   Mon, 19 Feb 2018 15:05:53 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mingo@...nel.org
Subject: Re: [RFC PATCH 3/5] asm-generic/bitops/atomic.h: Rewrite using
 atomic_fetch_*

On Mon, Feb 19, 2018 at 02:01:51PM +0000, Will Deacon wrote:
> If it's defined, then we could consider using cmpxchg64 to build atomic64
> instead of the locks. But even then, I'm not sure we're really helping
> anybody out in practice.

yeah, most 64bit archs have more atomics or ll/sc and would not use it
anyway I suppose.