linux-kernel - [PATCH 3.10 010/143] linux/const.h: Add _BITUL() and

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Message-Id: <1465122046-9645-11-git-send-email-w@1wt.eu>
Date:	Sun,  5 Jun 2016 12:18:33 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 010/143] linux/const.h: Add _BITUL() and _BITULL()

From: "H. Peter Anvin" <hpa@...ux.intel.com>

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@...ux.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@....eu>
---
 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) */
-- 
2.8.0.rc2.1.gbe9624a