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.
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