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linux/const.h: Add _BITUL() and _BITULL()

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Add macros for single bit definitions of a specific type.  These are
similar to the BIT() macro that already exists, but with a few
exceptions:

1. The namespace is such that they can be used in uapi definitions.
2. The type is set with the _AC() macro to allow it to be used in
   assembly.
3. The type is explicitly specified to be UL or ULL.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-nbca8p7cg6jyjoit7klh3o91@git.kernel.org
This commit is contained in:
H. Peter Anvin 2013-04-27 16:07:49 -07:00
parent f07d91ede6
commit 2fc016c5bd
1 changed files with 3 additions and 0 deletions
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3
include/uapi/linux/const.h
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@ -21,4 +21,7 @@
#define _AT(T,X) ((T)(X))
#endif
#define _BITUL(x) (_AC(1,UL) << (x))
#define _BITULL(x) (_AC(1,ULL) << (x))
#endif /* !(_LINUX_CONST_H) */