linux-kernel - Re: [PATCH 01/25] asm-generic: Change time_t and clock

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Date:	Tue, 13 May 2014 15:11:33 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Arnd Bergmann <arnd@...db.de>, Ley Foon Tan <lftan@...era.com>,
	James Hogan <james.hogan@...tec.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chung-Lin Tang <cltang@...esourcery.com>
Subject: Re: [PATCH 01/25] asm-generic: Change time_t and clock_t to 64 bit

On Tue, May 13, 2014 at 2:07 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 13 May 2014, Arnd Bergmann wrote:
>> On Tuesday 13 May 2014 18:17:40 Ley Foon Tan wrote:
>> > When we export this posix_types.h file for user software, they need to
>> > define this config, eg: CONFIG_32BIT_TIME to use 32 bit time. Is this
>> > what we want to do?
>>
>> No, this doesn't really work: You can't use CONFIG_* symbols in
>> user-visible header files.
>
> Then make the config symbol generate the header from a template.

Indeed. I think it's worthwhile to add CONFIG_* expansion for such "hard"
CONFIG symbols to make headers_install, cfr. the existing unifdef support.

We do such a hard work to improve asm-generic, so new architectures can
just use that, only to see early adaptors now having to migrate away from it
(e.g. OpenRISC suddenly gaining uapi/asm/posix_types.h).

Or is there another solution?

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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