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| author | H. Peter Anvin <hpa@linux.intel.com> | 2013-04-27 16:07:49 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2016-06-07 10:42:44 +0200 |
| commit | bb37dac1d940c3bfee710c925460a769c00ad7a7 (patch) | |
| tree | 8bb72987e6a8d08cb8acd19a0a9df134f86b99df /include | |
| parent | fa75115240f1930d2364484047ba6bb88ac2a6d2 (diff) | |
| download | lwn-bb37dac1d940c3bfee710c925460a769c00ad7a7.tar.gz lwn-bb37dac1d940c3bfee710c925460a769c00ad7a7.zip | |
linux/const.h: Add _BITUL() and _BITULL()
commit 2fc016c5bd8aad2e201cdf71b9fb4573f94775bd upstream.
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
[wt: backported to 3.10 only to keep next patch clean]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/const.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h index c22c707c455d..c872bfd25e13 100644 --- a/include/uapi/linux/const.h +++ b/include/uapi/linux/const.h @@ -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) */ |