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DateWed, 01 Apr 2009 14:20:58 -0700
From"H. Peter Anvin" <>
SubjectRe: [RFC] asm-generic/{unistd,types,posix_types}.h for new arch
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



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