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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