[src/riastradh-drm2]: src/sys/external/bsd/drm2/include/linux Define swap in ...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7040846ebf9e
branches:  riastradh-drm2
changeset: 788099:7040846ebf9e
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Jul 24 02:14:10 2013 +0000

description:
Define swap in <linux/kernel.h>.

Kinda hokey definition, but this avoids typeof.

diffstat:

 sys/external/bsd/drm2/include/linux/kernel.h |  15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diffs (27 lines):

diff -r ec23643bca98 -r 7040846ebf9e sys/external/bsd/drm2/include/linux/kernel.h
--- a/sys/external/bsd/drm2/include/linux/kernel.h      Wed Jul 24 02:13:57 2013 +0000
+++ b/sys/external/bsd/drm2/include/linux/kernel.h      Wed Jul 24 02:14:10 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kernel.h,v 1.1.2.6 2013/07/24 02:12:00 riastradh Exp $ */
+/*     $NetBSD: kernel.h,v 1.1.2.7 2013/07/24 02:14:10 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -53,4 +53,17 @@
 
 #define        WARN_ON(CONDITION)      WARN(CONDITION, "%s\n", #CONDITION)
 
+#define        swap(X, Y)      do                                              \
+{                                                                      \
+       /* XXX Kludge for type-safety.  */                              \
+       if (&(X) != &(Y)) {                                             \
+               CTASSERT(sizeof(X) == sizeof(Y));                       \
+               /* XXX Can't do this much better without typeof.  */    \
+               char __swap_tmp[sizeof(X)];                             \
+               (void)memcpy(__swap_tmp, &(X), sizeof(X));              \
+               (void)memcpy(&(X), &(Y), sizeof(X));                    \
+               (void)memcpy(&(Y), __swap_tmp, sizeof(X));              \
+       }                                                               \
+} while (0)
+
 #endif  /* _LINUX_KERNEL_H_ */