linux-kernel - Re: [PATCH 00/24] Unify integer type definitions, and add fixed type constructor macros

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Date:	Fri, 25 Apr 2008 10:15:31 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 00/24] Unify integer type definitions, and add fixed type constructor macros

On Friday 25 April 2008, H. Peter Anvin wrote:
> This patchset unifies the integer definitions across all the
> <asm-*/types.h> files, replacing them with two asm-generic files, one
> for the LL64 model (all 32-bit architectures plus x86-64) and one for
> the L64 model (all other 64-bit architectures.)

I started hacking on a similar patch just yesterday, but with a slightly
different goal. My intention was to move the headers in a direction
where a new architecture (microblaze being the next one) would no longer
have to care about ABI defining headers at all, but just use the defaults
from a single #include line.

I could deal with x86 by leaving the current asm-x86/types.h in place,
and change all the others so they can use the common one. The only
difference here would be umode_t and dma_addr_t, which are irregularly
defined on a few architectures, but we can assume reasonable defaults, as in

asm-powerpc/types.h:

#ifdef __powerpc64__
#define __umode_t unsigned int
#include <asm-generic/types_64.h>
#else
#include <asm-generic/types_32.h>
#endif

asm-generic/types_64.h:

#ifdef __umode_t
typedef __umode_t umode_t;
#else
typedef unsigned short umode_t;
#endif

	Arnd <><
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