From: Andreas Steinmetz <ast@domdv.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: David Howells <dhowells@redhat.com>,
torvalds@osdl.org, hch@infradead.org, matthew@wil.cx,
dwmw2@infradead.org, aoliva@redhat.com,
linux-kernel@vger.kernel.org, libc-hacker@sources.redhat.com
Subject: Re: [RFC] Splitting kernel headers and deprecating __KERNEL__
Date: Sat, 27 Nov 2004 22:49:50 +0100 [thread overview]
Message-ID: <41A8F67E.1060908@domdv.de> (raw)
In-Reply-To: <20041127211923.GA21765@mars.ravnborg.org>
Sam Ravnborg wrote:
> On Sat, Nov 27, 2004 at 10:11:43PM +0100, Andreas Steinmetz wrote:
>
>>>If we go for some resturcturing of include/ then we should get rid of
>>>the annoying asm symlink. Following layout deals with that:
>>>
>>>include/<arch>/asm <= Files from include/asm-<arch>
>>>include/<arch>/mach* <= Files from include/mach-*
>>>
>>>This layout solve the symlink issue in an elegant way.
>>>We need to do trivial changes to compiler options to make it work. Changing
>>>compiler options is much more relaible than using symlinks.
>>>
>>>Then the userspace part would then be located in:
>>>include/<arch>/user-asm
>>>
>>
>>This complicates things for bi-arch architectures like x86_64 where one
>>can use a dispatcher directory instead of a symlink to suit include/asm
>>for 32bit as well as 64bit.
>
> X86_64 does not create any special symlinks todays so I do not see the point?
> And still a symlink is just the wrong way to solve the problem.
> Adjusting options to the compiler is the way to do it.
Ok, this is not in the kernel, but think of the following: an
application needs and include/asm header. The application may be
compiled as 32 bit and as 64 bit. Then you could use a real asm
directory instead of a symlink and use, e.g. for asm/byteorder.h:
#ifdef __x86_64__
#include <asm-x86_64/byteorder.h>
#else
#include <asm-i386/byteorder.h>
#endif
This way both archs are satisfied from a userspace point of view without
having to take care if the source is compiled on 32bit or 64bit. If
you kill the symlink this neat dispatcher can't really be done anymore
that easy.
It is not necessary to do anything in the kernel tree here except to
keep the symlink to allow for this kind of userspace tweaks for certain
architectures.
This is especially important when there's need to use a include/linux
header which itself needs an include/asm header as in this case with the
the little tweak always the right asm header is included.
--
Andreas Steinmetz SPAMmers use robotrap@domdv.de
next prev parent reply other threads:[~2004-11-27 21:50 UTC|newest]
Thread overview: 185+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-25 15:13 [RFC] Splitting kernel headers and deprecating __KERNEL__ David Howells
2004-11-25 15:23 ` David Woodhouse
2004-11-25 16:54 ` Matthew Wilcox
2004-11-25 18:17 ` David Woodhouse
2004-11-27 3:24 ` Greg KH
2004-11-28 23:37 ` Paul Mackerras
2004-11-29 1:28 ` Linus Torvalds
2004-11-29 4:36 ` Jeff Garzik
2004-11-29 4:57 ` Al Viro
2004-11-29 5:27 ` Tim Hockin
2004-11-29 7:51 ` Arjan van de Ven
2004-12-05 0:49 ` Rob Landley
2004-12-05 2:26 ` Andries Brouwer
2004-12-05 13:19 ` David Greaves
2004-12-05 15:57 ` Andries Brouwer
2004-12-05 23:05 ` Rob Landley
2004-12-06 9:56 ` Andries Brouwer
2004-11-29 9:42 ` David Woodhouse
2004-11-30 8:08 ` Alex Riesen
2004-11-30 8:57 ` Alex Riesen
2004-12-01 11:46 ` Ralf Baechle
2004-12-02 1:21 ` H. Peter Anvin
2004-11-29 9:53 ` Paul Mackerras
2004-11-29 9:57 ` Arjan van de Ven
2004-11-29 10:01 ` David Woodhouse
2004-11-29 11:41 ` Mariusz Mazur
2004-11-29 17:09 ` Alexandre Oliva
2004-11-29 17:41 ` Linus Torvalds
2004-11-29 22:44 ` Al Viro
2004-12-01 11:36 ` Roman Zippel
[not found] ` <oract0thnj.fsf@livre.redhat.lsd.ic.unicamp.br>
2004-11-29 23:00 ` Linus Torvalds
2004-11-30 0:45 ` H. Peter Anvin
2004-11-30 5:31 ` Herbert Poetzl
2004-11-30 6:44 ` bert hubert
2004-11-30 21:22 ` Alexandre Oliva
2004-11-30 22:22 ` Linus Torvalds
2004-11-30 22:57 ` Alexandre Oliva
2004-11-30 23:12 ` Linus Torvalds
2004-12-01 19:41 ` Alexandre Oliva
2004-12-01 19:54 ` Matthew Wilcox
2004-12-02 3:58 ` Linus Torvalds
2004-12-02 4:28 ` Bernd Eckenfels
2004-12-02 5:11 ` Peter Williams
2004-12-02 11:30 ` Tomas Carnecky
2004-12-02 22:17 ` Peter Williams
2004-12-02 9:29 ` Pekka Enberg
2004-12-02 15:35 ` Linus Torvalds
2004-12-02 21:46 ` Pekka Enberg
2004-11-30 15:35 ` David Woodhouse
2004-11-30 15:58 ` Linus Torvalds
2004-11-30 16:28 ` David Woodhouse
2004-11-30 16:53 ` Linus Torvalds
2004-11-30 17:52 ` David Woodhouse
2004-11-30 18:21 ` Linus Torvalds
2004-11-30 20:28 ` Mariusz Mazur
2004-11-30 20:47 ` Linus Torvalds
2004-11-30 22:33 ` Sam Ravnborg
2004-11-30 22:44 ` Mariusz Mazur
2004-11-30 23:03 ` Al Viro
2004-11-30 23:08 ` Mariusz Mazur
2004-12-01 5:23 ` Sam Ravnborg
2004-12-01 10:52 ` Mariusz Mazur
2004-12-01 18:08 ` Sam Ravnborg
2004-11-30 23:13 ` Alexandre Oliva
2004-11-30 23:36 ` Chris Friesen
2004-12-01 5:50 ` H. Peter Anvin
2004-11-30 22:48 ` Matt Mackall
2004-11-30 22:51 ` Christoph Hellwig
2004-11-30 23:09 ` Chris Friesen
2004-11-30 23:35 ` Matt Mackall
2004-12-01 0:23 ` Miquel van Smoorenburg
2004-11-30 22:55 ` Linus Torvalds
2004-11-30 23:29 ` Matt Mackall
2004-12-03 1:03 ` Krzysztof Halasa
2004-11-30 23:51 ` David Woodhouse
2004-11-30 17:55 ` Al Viro
2004-11-30 16:33 ` David Howells
2004-11-30 16:57 ` Linus Torvalds
2004-11-30 15:33 ` David Howells
2004-11-30 15:51 ` Linus Torvalds
2004-11-30 20:47 ` Alexandre Oliva
2004-11-30 20:56 ` Linus Torvalds
2004-11-30 21:30 ` Alexandre Oliva
2004-11-30 21:39 ` Alexandre Oliva
2004-11-30 23:33 ` Matthew Wilcox
2004-11-30 22:25 ` Linus Torvalds
2004-11-30 22:34 ` David Woodhouse
2004-11-30 22:51 ` Linus Torvalds
2004-11-30 23:50 ` David Woodhouse
2004-12-01 0:10 ` Linus Torvalds
2004-12-01 0:18 ` Linus Torvalds
2004-12-01 8:10 ` Arjan van de Ven
2004-12-01 0:24 ` David Woodhouse
2004-12-01 0:37 ` Linus Torvalds
2004-12-01 0:47 ` David Woodhouse
2004-12-01 0:57 ` Linus Torvalds
2004-12-01 1:06 ` David Woodhouse
2004-12-01 1:23 ` Linus Torvalds
2004-12-01 6:48 ` BAIN
2004-12-01 2:02 ` cdrom.h (was Re: [RFC] Splitting kernel headers...) Matthew Wilcox
2004-11-30 22:52 ` [RFC] Splitting kernel headers and deprecating __KERNEL__ Mariusz Mazur
2004-11-30 23:05 ` Linus Torvalds
2004-11-30 23:05 ` Alexandre Oliva
2004-11-30 16:18 ` David Howells
2004-12-14 5:51 ` Werner Almesberger
2004-12-14 15:49 ` Linus Torvalds
2004-12-14 16:50 ` Werner Almesberger
2004-12-14 17:58 ` Linus Torvalds
2004-12-14 21:46 ` Werner Almesberger
2004-12-14 21:58 ` Linus Torvalds
2004-12-14 23:49 ` Krzysztof Halasa
2004-12-15 0:09 ` Werner Almesberger
2004-12-16 0:58 ` Krzysztof Halasa
2004-12-14 19:23 ` Horst von Brand
2004-12-14 19:45 ` Sam Ravnborg
2004-12-14 19:58 ` Linus Torvalds
2004-12-14 20:25 ` Andreas Schwab
2004-12-14 20:33 ` Linus Torvalds
2004-12-14 16:55 ` Andreas Schwab
2004-12-14 17:59 ` Linus Torvalds
2004-11-27 20:39 ` Sam Ravnborg
2004-11-25 18:20 ` Alexandre Oliva
2004-11-25 21:01 ` Matthew Wilcox
2004-11-25 22:35 ` David Woodhouse
2004-11-26 11:42 ` Alexandre Oliva
2004-11-27 0:13 ` Andreas Steinmetz
2004-11-27 0:26 ` David Woodhouse
2004-11-27 0:30 ` Andreas Steinmetz
2004-11-27 0:38 ` David Woodhouse
2004-11-26 11:47 ` Alexandre Oliva
2004-11-26 11:53 ` David Woodhouse
2004-11-27 16:12 ` Krzysztof Halasa
2004-11-26 11:58 ` David Howells
2004-11-26 12:00 ` David Woodhouse
2004-11-26 14:19 ` Matthew Wilcox
2004-11-26 14:33 ` David Woodhouse
2004-11-27 12:10 ` Alexander Stohr
2004-11-27 3:46 ` Adam Heath
2004-11-30 12:18 ` Horst von Brand
2004-11-29 16:34 ` Alexandre Oliva
2004-11-25 18:45 ` Matthew Wilcox
2004-11-26 11:52 ` David Howells
2004-11-26 23:56 ` Grzegorz Kulewski
2004-11-27 1:27 ` Tomas Carnecky
2004-11-27 1:41 ` Grzegorz Kulewski
2004-11-27 2:03 ` Tomas Carnecky
2004-11-27 3:07 ` Kyle Moffett
2004-11-27 4:29 ` Tonnerre
2004-11-27 3:51 ` Matthew Wilcox
2004-11-27 16:47 ` Randy.Dunlap
2004-11-27 17:16 ` David Woodhouse
2004-11-27 22:53 ` Arnd Bergmann
2004-11-27 23:12 ` David Woodhouse
2004-11-27 23:27 ` Randy.Dunlap
2004-11-27 23:32 ` David Woodhouse
2004-11-27 23:56 ` Arnd Bergmann
2004-11-28 7:13 ` Arjan van de Ven
2004-11-28 12:03 ` Arnd Bergmann
2004-11-28 12:19 ` Arjan van de Ven
2004-11-28 16:34 ` Kevin Puetz
2004-11-28 12:28 ` Wichert Akkerman
2004-11-28 12:44 ` Arjan van de Ven
2004-11-28 16:21 ` Jakub Jelinek
2004-11-28 7:20 ` Christoph Hellwig
2004-11-27 4:05 ` Chris Friesen
2004-11-27 4:30 ` Tomas Carnecky
2004-11-27 21:03 ` Sam Ravnborg
2004-11-27 21:11 ` Andreas Steinmetz
2004-11-27 21:19 ` Sam Ravnborg
2004-11-27 21:49 ` Andreas Steinmetz [this message]
2004-11-27 23:21 ` Arnd Bergmann
2004-11-28 13:24 ` Andreas Steinmetz
2004-11-28 13:40 ` Arnd Bergmann
2004-11-29 11:08 ` David Howells
2004-11-29 20:01 ` H. Peter Anvin
2004-11-30 0:34 ` Kyle Moffett
2004-11-30 0:51 ` H. Peter Anvin
2004-12-14 7:07 ` Werner Almesberger
2004-11-27 19:43 Dan Kegel
2004-11-27 21:06 ` Sam Ravnborg
[not found] <34Xo6-2P0-19@gated-at.bofh.it>
[not found] ` <35i9f-2vZ-25@gated-at.bofh.it>
[not found] ` <35iLS-2Uo-1@gated-at.bofh.it>
[not found] ` <35kb6-46Q-25@gated-at.bofh.it>
2004-11-28 0:55 ` ak
2004-11-28 13:32 ` Arnd Bergmann
2004-11-30 1:43 Jean Tourrilhes
2004-11-30 4:22 ` Linus Torvalds
2004-11-30 6:51 ` H. Peter Anvin
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