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

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Date:	Fri, 10 Jul 2015 11:10:33 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"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>,
	Russell King <linux@....linux.org.uk>,
	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>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC][PATCH 23/24] atomic: Collapse all atomic_{set,clear}_mask definitions

Hi Peter,

On Thu, Jul 9, 2015 at 7:29 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> --- a/include/linux/atomic.h
> +++ b/include/linux/atomic.h
> @@ -28,6 +28,23 @@ static inline int atomic_add_unless(atom
>  #define atomic_inc_not_zero(v)         atomic_add_unless((v), 1, 0)
>  #endif
>
> +#ifndef atomic_nand
> +static inline void atomic_nand(int i, atomic_t *v)
> +{
> +       atomic_and(~i, v);

That sounds like a misnomer...

Your NAND is "A & ~B", while my[*] NAND is "~(A & B)"?

[*] https://en.wikipedia.org/wiki/NAND_logic

What about atomic_clear()? (Is atomic_bic() too ARM-centric?)

> +}
> +#endif
> +
> +static inline __deprecated void atomic_clear_mask(unsigned int mask, atomic_t *v)
> +{
> +       atomic_nand(mask, v);
> +}

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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