[src/riastradh-drm2]: src/sys/external/bsd/drm2/include/linux Use a union rat...

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

details:   https://anonhg.NetBSD.org/src/rev/fe1392b2fe5e
branches:  riastradh-drm2
changeset: 788057:fe1392b2fe5e
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Jul 24 02:02:17 2013 +0000

description:
Use a union rather than casts in <linux/atomic.h>.  Add atomic_dec.

diffstat:

 sys/external/bsd/drm2/include/linux/atomic.h |  21 +++++++++++++++------
 1 files changed, 15 insertions(+), 6 deletions(-)

diffs (55 lines):

diff -r 2313dba40534 -r fe1392b2fe5e sys/external/bsd/drm2/include/linux/atomic.h
--- a/sys/external/bsd/drm2/include/linux/atomic.h      Wed Jul 24 02:02:03 2013 +0000
+++ b/sys/external/bsd/drm2/include/linux/atomic.h      Wed Jul 24 02:02:17 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: atomic.h,v 1.1.2.3 2013/07/24 01:55:58 riastradh Exp $ */
+/*     $NetBSD: atomic.h,v 1.1.2.4 2013/07/24 02:02:17 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -35,31 +35,40 @@
 #include <sys/atomic.h>
 
 typedef struct {
-       int atomic_value;
+       union {
+               int au_int;
+               unsigned int au_uint;
+       } a_u;
 } atomic_t;
 
 static inline int
 atomic_read(atomic_t *atomic)
 {
-       return *(volatile int *)&atomic->atomic_value;
+       return *(volatile int *)&atomic->a_u.au_int;
 }
 
 static inline void
 atomic_set(atomic_t *atomic, int value)
 {
-       atomic->atomic_value = value;
+       atomic->a_u.au_int = value;
 }
 
 static inline void
 atomic_inc(atomic_t *atomic)
 {
-       atomic_inc_uint((unsigned int *)&atomic->atomic_value);
+       atomic_inc_uint(&atomic->a_u.au_uint);
+}
+
+static inline void
+atomic_dec(atomic_t *atomic)
+{
+       atomic_dec_uint(&atomic->a_u.au_uint);
 }
 
 static inline int
 atomic_dec_and_test(atomic_t *atomic)
 {
-       return (-1 == (int)atomic_dec_uint_nv(&atomic->atomic_value));
+       return (-1 == (int)atomic_dec_uint_nv(&atomic->a_u.au_uint));
 }
 
 #endif  /* _LINUX_ATOMIC_H_ */