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SubjectRe: about __BITS_PER_LONG
Date
On Monday 11 April 2011, Guan Xuetao wrote:
> --- a/include/asm-generic/bitsperlong.h
> +++ b/include/asm-generic/bitsperlong.h
> @@ -9,7 +9,11 @@
> * to decide it, but rather check a compiler provided macro.
> */
> #ifndef __BITS_PER_LONG
> -#define __BITS_PER_LONG 32
> +# ifdef CONFIG_64BIT
> +# define __BITS_PER_LONG 64
> +# else
> +# define __BITS_PER_LONG 32
> +# endif /* CONFIG_64BIT */
> #endif
>

Unfortunately, this does not work, because the __BITS_PER_LONG definition is meant
for user space. You have to make this depend on a preprocessor macro that
is provided by the compiler based on the command line switches (e.g. -m64) that
a use could pass to the compiler.

In user space, the CONFIG_* symbols are meaningless.

Arnd


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