Re: [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}()

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}()
From: Andreas Schwab <schwab@xxxxxxxxxxxxxx>
Date: Thu, 16 Jun 2016 16:37:36 +0200
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx>, boqun.feng@xxxxxxxxx, waiman.long@xxxxxxx, Frédéric Weisbecker <fweisbec@xxxxxxxxx>, "linux-kernel\@vger.kernel.org" <linux-kernel@xxxxxxxxxxxxxxx>, Linux-Arch <linux-arch@xxxxxxxxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxxx>, Vineet Gupta <vgupta@xxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxxx>, Hans-Christian Noren Egtvedt <egtvedt@xxxxxxxxxxxx>, Miao Steven <realmz6@xxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Richard Kuo <rkuo@xxxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, James Hogan <james.hogan@xxxxxxxxxx>, Ralf Baechle <ralf@xxxxxxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, cmetcalf@xxxxxxxxxxxx, Max Filippov <jcmvbkbc@xxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, dbueso@xxxxxxx, Wu Fengguang <fengguang.wu@xxxxxxxxx>, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>
In-reply-to: <20160616143530.GG30921@twins.programming.kicks-ass.net> (Peter Zijlstra's message of "Thu, 16 Jun 2016 16:35:30 +0200")
References: <20160531101925.702692792@infradead.org> <20160531102642.333689893@infradead.org> <CAMuHMdXG4veEOqr5vcZQEQH55=CT6CPXOfqrc_m=fpXEseAdLA@mail.gmail.com> <20160616101309.GD30921@twins.programming.kicks-ass.net> <mvmk2hpxq1a.fsf@hawking.suse.de> <20160616124949.GF30921@twins.programming.kicks-ass.net> <mvma8ilxpl6.fsf@hawking.suse.de> <20160616143530.GG30921@twins.programming.kicks-ass.net>
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> So the "2" input operand actually sets the value of "=&d" (tmp), how
> creative...

That was the only way to do it when this was written.

Andreas.

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Follow-Ups:
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References:
- [PATCH -v2 00/33] implement atomic_fetch_$op
  - From: Peter Zijlstra
- [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}()
  - From: Peter Zijlstra
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