linux-kernel - Re: [PATCH 3/8] sparc32: unify __cmpxchg

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Message-Id: <d85654ba-54b5-419a-89e5-526660284769@app.fastmail.com>
Date: Tue, 02 Apr 2024 09:28:57 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Alexander Viro" <viro@...iv.linux.org.uk>,
 "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
 "David S . Miller" <davem@...emloft.net>,
 "Andreas Larsson" <andreas@...sler.com>,
 "Palmer Dabbelt" <palmer@...osinc.com>, "Marco Elver" <elver@...gle.com>
Subject: Re: [PATCH 3/8] sparc32: unify __cmpxchg_u{32,64}

On Tue, Apr 2, 2024, at 06:28, Al Viro wrote:
> Add a macro that expands to one of those when given u32 or u64
> as an argument - atomic32.c has a lot of similar stuff already.
>
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>

I think we should merge Sam's series to remove non-CAS sparc32
first:

https://lore.kernel.org/all/20240309-sunset-v2-0-f09912574d2c@ravnborg.org/

I don't see a patch yet to actually change cmpxchg() to use CAS,
but it can probably just share the sparc64 implementation at
that point.

    Arnd