linux-kernel - [PATCH 3 of 8] x86: add _AT() macro to conditionally cast

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <f7e7db3facd940654510.1199391060@localhost>
Date:	Thu, 03 Jan 2008 12:11:00 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Glauber de Oliveira Costa <glommer@...il.com>,
	Jan Beulich <jbeulich@...ell.com>
Subject: [PATCH 3 of 8] x86: add _AT() macro to conditionally cast

# HG changeset patch
# User Jeremy Fitzhardinge <jeremy@...source.com>
# Date 1199317452 28800
# Node ID f7e7db3facd9406545103164f9be8f9ba1a2b549
# Parent  4d9a413a0f4c1d98dbea704f0366457b5117045d
x86: add _AT() macro to conditionally cast

Define _AT(type, value) to conditionally cast a value when compiling C
code, but not when used in assembler.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

---
 include/linux/const.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/const.h b/include/linux/const.h
--- a/include/linux/const.h
+++ b/include/linux/const.h
@@ -7,13 +7,18 @@
  * C code.  Therefore we cannot annotate them always with
  * 'UL' and other type specifiers unilaterally.  We
  * use the following macros to deal with this.
+ *
+ * Similarly, _AT() will cast an expression with a type in C, but
+ * leave it unchanged in asm.
  */
 
 #ifdef __ASSEMBLY__
 #define _AC(X,Y)	X
+#define _AT(T,X)	X
 #else
 #define __AC(X,Y)	(X##Y)
 #define _AC(X,Y)	__AC(X,Y)
+#define _AT(T,X)	((T)(X))
 #endif
 
 #endif /* !(_LINUX_CONST_H) */


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/