linux-kernel - Re: [RFC][PATCH 23/24] atomic: Collapse all atomic_{set,clear}

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Message-ID: <20150710162739.GN19282@twins.programming.kicks-ass.net>
Date:	Fri, 10 Jul 2015 18:27:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Chris Metcalf <cmetcalf@...hip.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>,
	Vineet Gupta <vgupta@...opsys.com>,
	Will Deacon <will.deacon@....com>,
	Håvard Skinnemoen <hskinnemoen@...il.com>,
	Miao Steven <realmz6@...il.com>,
	David Howells <dhowells@...hat.com>,
	Richard Kuo <rkuo@...eaurora.org>,
	Tony Luck <tony.luck@...el.com>,
	James Hogan <james.hogan@...tec.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC][PATCH 23/24] atomic: Collapse all atomic_{set,clear}_mask
 definitions

On Fri, Jul 10, 2015 at 02:42:56PM +0100, Russell King - ARM Linux wrote:
> The obvious question though is whether we have an established name for this
> operation elsewhere in the kernel, and whether we should have consistency.

Consistency is good.

> In include/linux, we already have (grepping for 'and_*not'):
> 
> include/linux/nodemask.h:#define nodes_andnot(dst, src1, src2) \
> include/linux/bitmap.h:extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
> include/linux/cpumask.h:static inline int cpumask_andnot(struct cpumask *dstp,
> 
> We also have:
> 
> include/linux/signal.h:#define _sig_andn(x,y)       ((x) & ~(y))
> 
> which seems to be the only instance of "andn" in include/.

How about I rename the _sig_andn one to _sig_andnot, and go with
atomic_andnot, to match the *mask functions.

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