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authorChristoph Lameter <clameter@engr.sgi.com>2006-01-06 00:11:20 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:29 -0800
commitd3cb487149bd706aa6aeb02042332a450978dc1c (patch)
tree69051e0f9853314cf275e4e800faad950e3053c3 /include/asm-generic/atomic.h
parent070f80326a215d8e6c4fd6f175e28eb446c492bc (diff)
downloadop-kernel-dev-d3cb487149bd706aa6aeb02042332a450978dc1c.zip
op-kernel-dev-d3cb487149bd706aa6aeb02042332a450978dc1c.tar.gz
[PATCH] atomic_long_t & include/asm-generic/atomic.h V2
Several counters already have the need to use 64 atomic variables on 64 bit platforms (see mm_counter_t in sched.h). We have to do ugly ifdefs to fall back to 32 bit atomic on 32 bit platforms. The VM statistics patch that I am working on will also make more extensive use of atomic64. This patch introduces a new type atomic_long_t by providing definitions in asm-generic/atomic.h that works similar to the c "long" type. Its 32 bits on 32 bit platforms and 64 bits on 64 bit platforms. Also cleans up the determination of the mm_counter_t in sched.h. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic/atomic.h')
-rw-r--r--include/asm-generic/atomic.h116
1 files changed, 116 insertions, 0 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
new file mode 100644
index 0000000..e0a28b9
--- /dev/null
+++ b/include/asm-generic/atomic.h
@@ -0,0 +1,116 @@
+#ifndef _ASM_GENERIC_ATOMIC_H
+#define _ASM_GENERIC_ATOMIC_H
+/*
+ * Copyright (C) 2005 Silicon Graphics, Inc.
+ * Christoph Lameter <clameter@sgi.com>
+ *
+ * Allows to provide arch independent atomic definitions without the need to
+ * edit all arch specific atomic.h files.
+ */
+
+
+/*
+ * Suppport for atomic_long_t
+ *
+ * Casts for parameters are avoided for existing atomic functions in order to
+ * avoid issues with cast-as-lval under gcc 4.x and other limitations that the
+ * macros of a platform may have.
+ */
+
+#if BITS_PER_LONG == 64
+
+typedef atomic64_t atomic_long_t;
+
+#define ATOMIC_LONG_INIT(i) ATOMIC64_INIT(i)
+
+static inline long atomic_long_read(atomic_long_t *l)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ return (long)atomic64_read(v);
+}
+
+static inline void atomic_long_set(atomic_long_t *l, long i)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ atomic_set(v, i);
+}
+
+static inline void atomic_long_inc(atomic_long_t *l)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ atomic64_inc(v);
+}
+
+static inline void atomic_long_dec(atomic_long_t *l)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ atomic64_dec(v);
+}
+
+static inline void atomic_long_add(long i, atomic_long_t *l)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ atomic64_add(i, v);
+}
+
+static inline void atomic_long_sub(long i, atomic_long_t *l)
+{
+ atomic64_t *v = (atomic64_t *)l;
+
+ atomic64_sub(i, v);
+}
+
+#else
+
+typedef atomic_t atomic_long_t;
+
+#define ATOMIC_LONG_INIT(i) ATOMIC_INIT(i)
+static inline long atomic_long_read(atomic_long_t *l)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ return (long)atomic_read(v);
+}
+
+static inline void atomic_long_set(atomic_long_t *l, long i)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ atomic_set(v, i);
+}
+
+static inline void atomic_long_inc(atomic_long_t *l)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ atomic_inc(v);
+}
+
+static inline void atomic_long_dec(atomic_long_t *l)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ atomic_dec(v);
+}
+
+static inline void atomic_long_add(long i, atomic_long_t *l)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ atomic_add(i, v);
+}
+
+static inline void atomic_long_sub(long i, atomic_long_t *l)
+{
+ atomic_t *v = (atomic_t *)l;
+
+ atomic_sub(i, v);
+}
+
+#endif
+#endif
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