From: "tip-bot for H. Peter Anvin" <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
tglx@linutronix.de, hpa@linux.intel.com
Subject: [tip:x86/asm] linux/const.h: Add _BITUL() and _BITULL()
Date: Tue, 25 Jun 2013 15:54:30 -0700 [thread overview]
Message-ID: <tip-nbca8p7cg6jyjoit7klh3o91@git.kernel.org> (raw)
Commit-ID: 2fc016c5bd8aad2e201cdf71b9fb4573f94775bd
Gitweb: http://git.kernel.org/tip/2fc016c5bd8aad2e201cdf71b9fb4573f94775bd
Author: H. Peter Anvin <hpa@linux.intel.com>
AuthorDate: Sat, 27 Apr 2013 16:07:49 -0700
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 25 Jun 2013 15:50:04 -0700
linux/const.h: Add _BITUL() and _BITULL()
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
---
include/uapi/linux/const.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h
index c22c707..c872bfd 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) */
reply other threads:[~2013-06-25 22:54 UTC|newest]
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