Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=74ef649fe847fdfbd3e1732d21b923f59ca04e8c
Commit: 74ef649fe847fdfbd3e1732d21b923f59ca04e8c
Parent: 345b904c3f7c24fbfadfee7cddd5896d13b176d9
Author: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:32:42 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:32:42 2008 +0100
x86: add _AT() macro to conditionally cast
# HG changeset patch
# User Jeremy Fitzhardinge <[EMAIL PROTECTED]>
# 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 <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
include/linux/const.h | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/const.h b/include/linux/const.h
index 07b300b..c22c707 100644
--- 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) */
-
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