linux-kernel - Re: [PATCH 01/16] math128: Introduce various 128bit primitives

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Message-ID: <CAMuHMdXUg-gzTD1NyBH=cfreg8vqN-dDpVGiEkj_pkS-4a1odg@mail.gmail.com>
Date:	Thu, 25 Oct 2012 07:21:38 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	peterz@...radead.org, tglx@...utronix.de, mingo@...hat.com,
	rostedt@...dmis.org, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com,
	jkacur@...hat.com, harald.gustafsson@...csson.com,
	vincent.guittot@...aro.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 01/16] math128: Introduce various 128bit primitives

On Wed, Oct 24, 2012 at 11:53 PM, Juri Lelli <juri.lelli@...il.com> wrote:
> +#ifdef __SIZEOF_INT128__ /* gcc-4.6+ */
> +       unsigned __int128 val;
> +#endif

So the definition of val depends on (gcc) __SIZEOF_INT128__...

> +/*
> + * Make usage of __int128 dependent on arch code so they can
> + * judge if gcc is doing the right thing for them and can over-ride
> + * any funnies.
> + */
> +
> +#ifndef ARCH_HAS_INT128

... but all generic users depend on (Kconfig) ARCH_HAS_INT128?

How can Kconfig know if gcc supports this?

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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