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asm-generic: introduce asm/bitsperlong.h

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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>
This commit is contained in:
Arnd Bergmann
2009-05-13 22:56:25 +00:00
committed by Arnd Bergmann
parent 63b852a6b6
commit c31ae4bb4a
33 changed files with 145 additions and 46 deletions
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8
arch/ia64/include/asm/bitsperlong.h Normal file
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@ -0,0 +1,8 @@
#ifndef __ASM_IA64_BITSPERLONG_H
#define __ASM_IA64_BITSPERLONG_H
#define __BITS_PER_LONG 64
#include <asm-generic/bitsperlong.h>
#endif /* __ASM_IA64_BITSPERLONG_H */

7
arch/ia64/include/asm/types.h
View File

@ -19,10 +19,6 @@
# define __IA64_UL(x) (x)
# define __IA64_UL_CONST(x) x
# ifdef __KERNEL__
# define BITS_PER_LONG 64
# endif
#else
# define __IA64_UL(x) ((unsigned long)(x))
# define __IA64_UL_CONST(x) x##UL
@ -34,10 +30,7 @@ typedef unsigned int umode_t;
*/
# ifdef __KERNEL__
#define BITS_PER_LONG 64
/* DMA addresses are 64-bits wide, in general. */
typedef u64 dma_addr_t;
# endif /* __KERNEL__ */