From: "H. Peter Anvin" <hpa@zytor.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Will Newton <will.newton@gmail.com>,
Geert Uytterhoeven <geert.uytterhoeven@gmail.com>,
michal.simek@petalogix.com,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-arch@vger.kernel.org, linux-api@vger.kernel.org,
Chen Liqin <liqin.chen@sunplusct.com>
Subject: Re: [RFC] asm-generic/{unistd,types,posix_types}.h for new arch
Date: Wed, 01 Apr 2009 14:20:58 -0700 [thread overview]
Message-ID: <49D3DABA.2050001@zytor.com> (raw)
In-Reply-To: <200904011704.13581.arnd@arndb.de>
Arnd Bergmann wrote:
>
> Unfortunately, there is no generic way to detect the word size yet,
> but every architecture uses its own preprocessor macro (__x86_64__,
> __s390x__, __ppc64__). We also can't use CONFIG_64BIT in an user-exported
> interface header file, because the use space can also be compiled for
> 32 bits when the kernel uses 64 bits.
>
Actually, gcc does have the _LP64 and __SIZEOF_POINTER__ macros (as well
as __CHAR_BIT__), although I don't know how far back it does have that.
If it has been with us for long enough it might be possible to
switch over to using panarch macros.
-hpa
next prev parent reply other threads:[~2009-04-01 21:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-30 7:15 Removing __kernel_old_uid_t, git_t, dev_t Michal Simek
2009-03-30 13:58 ` Arnd Bergmann
2009-03-30 14:41 ` Geert Uytterhoeven
[not found] ` <10f740e80903300741h387e6342veba0ccceea6714e9-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-03-30 15:17 ` Arnd Bergmann
2009-03-30 15:17 ` Arnd Bergmann
[not found] ` <200903301717.57184.arnd-r2nGTMty4D4@public.gmane.org>
2009-03-30 21:11 ` David Miller
2009-03-30 21:11 ` David Miller
[not found] ` <20090330.141156.62568451.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2009-03-31 0:26 ` Arnd Bergmann
2009-03-31 0:26 ` Arnd Bergmann
2009-04-01 14:11 ` [RFC] asm-generic/{unistd,types,posix_types}.h for new arch Arnd Bergmann
2009-04-01 14:11 ` Arnd Bergmann
[not found] ` <200904011611.53355.arnd-r2nGTMty4D4@public.gmane.org>
2009-04-01 14:39 ` Will Newton
2009-04-01 14:39 ` Will Newton
2009-04-01 15:04 ` Arnd Bergmann
2009-04-01 21:20 ` H. Peter Anvin [this message]
2009-04-01 21:32 ` Roland McGrath
[not found] ` <20090401213219.7B324FC3AB-nL1rrgvulkc2UH6IwYuUx0EOCMrvLtNR@public.gmane.org>
2009-04-02 13:06 ` Arnd Bergmann
2009-04-02 13:06 ` Arnd Bergmann
2009-04-01 17:55 ` Arnd Bergmann
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