linux-kernel - [tip:x86/asm] linux/const.h: Add _BITUL() and

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Date:	Tue, 25 Jun 2013 15:54:30 -0700
From:	"tip-bot for H. Peter Anvin" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/asm] linux/const.h: Add _BITUL() and _BITULL()

Commit-ID:  2fc016c5bd8aad2e201cdf71b9fb4573f94775bd
Gitweb:     http://git.kernel.org/tip/2fc016c5bd8aad2e201cdf71b9fb4573f94775bd
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Sat, 27 Apr 2013 16:07:49 -0700
Committer:  H. Peter Anvin <hpa@...ux.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@...ux.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) */
--
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