forked from mirrors/linux
c31ae4bb4a
This provides a reliable way for asm-generic/types.h and other files to find out if it is running on a 32 or 64 bit platform. We cannot use CONFIG_64BIT for this in headers that are included from user space because CONFIG symbols are not available there. We also cannot do it inside of asm/types.h because some headers need the word size but cannot include types.h. The solution is to introduce a new header <asm/bitsperlong.h> that defines both __BITS_PER_LONG for user space and BITS_PER_LONG for usage in the kernel. The asm-generic version falls back to 32 bit unless the architecture overrides it, which I did for all 64 bit platforms. Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
32 lines
874 B
C
32 lines
874 B
C
#ifndef __ASM_GENERIC_BITS_PER_LONG
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#define __ASM_GENERIC_BITS_PER_LONG
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/*
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* There seems to be no way of detecting this automatically from user
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* space, so 64 bit architectures should override this in their
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* bitsperlong.h. In particular, an architecture that supports
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* both 32 and 64 bit user space must not rely on CONFIG_64BIT
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* to decide it, but rather check a compiler provided macro.
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*/
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#ifndef __BITS_PER_LONG
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#define __BITS_PER_LONG 32
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#endif
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#ifdef __KERNEL__
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#ifdef CONFIG_64BIT
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#define BITS_PER_LONG 64
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#else
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#define BITS_PER_LONG 32
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#endif /* CONFIG_64BIT */
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/*
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* FIXME: The check currently breaks x86-64 build, so it's
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* temporarily disabled. Please fix x86-64 and reenable
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*/
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#if 0 && BITS_PER_LONG != __BITS_PER_LONG
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#error Inconsistent word size. Check asm/bitsperlong.h
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_GENERIC_BITS_PER_LONG */
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