How to determine the wordsize in Linux kernel programming?

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In userspace code, the macro __WORDSIZE is used, included in <bits/wordsize.h>. However, when I do Linux kernel programming, the __WORDSIZE seems not to be allowed to used.

If <bits/wordsize.h> is included, it will receive a compile error, saying:

error: bits/wordsize.h: No such file or directory

but if <bits/wordsize.h> is not included, it will receive another compile error, saying:

error: ‘__WORDSIZE’ undeclared.

It seems that kernel programming doesn't support the <bits/wordsize.h> header file. What should I do to judge the wordsize in Linux kernel programming?

P.S. my compiler version is gcc (GCC) 4.4.6.

asked 26 secs ago

Victor

88

How to determine the wordsize in Linux kernel programming?