[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>
diff --git a/include/asm-alpha/atomic.h b/include/asm-alpha/atomic.h
index 6183eab..cb03bbe 100644
--- a/include/asm-alpha/atomic.h
+++ b/include/asm-alpha/atomic.h
@@ -216,4 +216,5 @@
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
+#include <asm-generic/atomic.h>
#endif /* _ALPHA_ATOMIC_H */
diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h
index d586f65..f72b633 100644
--- a/include/asm-arm/atomic.h
+++ b/include/asm-arm/atomic.h
@@ -205,5 +205,6 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
#endif
diff --git a/include/asm-arm26/atomic.h b/include/asm-arm26/atomic.h
index a47cadc..3074b0e 100644
--- a/include/asm-arm26/atomic.h
+++ b/include/asm-arm26/atomic.h
@@ -118,5 +118,6 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
#endif
diff --git a/include/asm-cris/atomic.h b/include/asm-cris/atomic.h
index 683b05a..2df2c7a 100644
--- a/include/asm-cris/atomic.h
+++ b/include/asm-cris/atomic.h
@@ -156,4 +156,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
diff --git a/include/asm-frv/atomic.h b/include/asm-frv/atomic.h
index f6539ff..3f54fea 100644
--- a/include/asm-frv/atomic.h
+++ b/include/asm-frv/atomic.h
@@ -426,4 +426,5 @@
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+#include <asm-generic/atomic.h>
#endif /* _ASM_ATOMIC_H */
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
diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h
index f23d868..d891541 100644
--- a/include/asm-h8300/atomic.h
+++ b/include/asm-h8300/atomic.h
@@ -137,4 +137,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __ARCH_H8300_ATOMIC __ */
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h
index c68557a..7a5472d 100644
--- a/include/asm-i386/atomic.h
+++ b/include/asm-i386/atomic.h
@@ -254,4 +254,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h
index 2fbebf8..15cf798 100644
--- a/include/asm-ia64/atomic.h
+++ b/include/asm-ia64/atomic.h
@@ -192,4 +192,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* _ASM_IA64_ATOMIC_H */
diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h
index ef1fb8e..7076127 100644
--- a/include/asm-m32r/atomic.h
+++ b/include/asm-m32r/atomic.h
@@ -313,4 +313,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* _ASM_M32R_ATOMIC_H */
diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
index e3c962e..b8a4e75 100644
--- a/include/asm-m68k/atomic.h
+++ b/include/asm-m68k/atomic.h
@@ -157,4 +157,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __ARCH_M68K_ATOMIC __ */
diff --git a/include/asm-m68knommu/atomic.h b/include/asm-m68knommu/atomic.h
index 3c1cc15..1702dbe 100644
--- a/include/asm-m68knommu/atomic.h
+++ b/include/asm-m68knommu/atomic.h
@@ -143,4 +143,5 @@
#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic_inc_return(v) atomic_add_return(1,(v))
+#include <asm-generic/atomic.h>
#endif /* __ARCH_M68KNOMMU_ATOMIC __ */
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h
index 55c37c1..92256e4 100644
--- a/include/asm-mips/atomic.h
+++ b/include/asm-mips/atomic.h
@@ -713,4 +713,5 @@
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
+#include <asm-generic/atomic.h>
#endif /* _ASM_ATOMIC_H */
diff --git a/include/asm-parisc/atomic.h b/include/asm-parisc/atomic.h
index 983e9a2..64ebd08 100644
--- a/include/asm-parisc/atomic.h
+++ b/include/asm-parisc/atomic.h
@@ -216,4 +216,5 @@
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
+#include <asm-generic/atomic.h>
#endif
diff --git a/include/asm-powerpc/atomic.h b/include/asm-powerpc/atomic.h
index ec4b144..ae395a0 100644
--- a/include/asm-powerpc/atomic.h
+++ b/include/asm-powerpc/atomic.h
@@ -402,5 +402,6 @@
#endif /* __powerpc64__ */
+#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_ATOMIC_H_ */
diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h
index b3bd4f6..6d07c7d 100644
--- a/include/asm-s390/atomic.h
+++ b/include/asm-s390/atomic.h
@@ -215,5 +215,6 @@
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
+#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* __ARCH_S390_ATOMIC__ */
diff --git a/include/asm-sh/atomic.h b/include/asm-sh/atomic.h
index aabfd33..618d8e0 100644
--- a/include/asm-sh/atomic.h
+++ b/include/asm-sh/atomic.h
@@ -140,4 +140,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __ASM_SH_ATOMIC_H */
diff --git a/include/asm-sh64/atomic.h b/include/asm-sh64/atomic.h
index 927a2bc..f3ce5c0 100644
--- a/include/asm-sh64/atomic.h
+++ b/include/asm-sh64/atomic.h
@@ -152,4 +152,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __ASM_SH64_ATOMIC_H */
diff --git a/include/asm-sparc/atomic.h b/include/asm-sparc/atomic.h
index 62bec7a..accb496 100644
--- a/include/asm-sparc/atomic.h
+++ b/include/asm-sparc/atomic.h
@@ -159,4 +159,5 @@
#endif /* !(__KERNEL__) */
+#include <asm-generic/atomic.h>
#endif /* !(__ARCH_SPARC_ATOMIC__) */
diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index 3789fe3..11f5aa5 100644
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -96,4 +96,5 @@
#define smp_mb__after_atomic_inc() barrier()
#endif
+#include <asm-generic/atomic.h>
#endif /* !(__ARCH_SPARC64_ATOMIC__) */
diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h
index bede317..f5b9ab6 100644
--- a/include/asm-v850/atomic.h
+++ b/include/asm-v850/atomic.h
@@ -126,4 +126,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __V850_ATOMIC_H__ */
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 50db9f3..72eb071 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -424,4 +424,5 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index 3670cc7..e2ce06b 100644
--- a/include/asm-xtensa/atomic.h
+++ b/include/asm-xtensa/atomic.h
@@ -286,6 +286,7 @@
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* _XTENSA_ATOMIC_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b0ad6f3..7da3361 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -254,25 +254,12 @@
* The mm counters are not protected by its page_table_lock,
* so must be incremented atomically.
*/
-#ifdef ATOMIC64_INIT
-#define set_mm_counter(mm, member, value) atomic64_set(&(mm)->_##member, value)
-#define get_mm_counter(mm, member) ((unsigned long)atomic64_read(&(mm)->_##member))
-#define add_mm_counter(mm, member, value) atomic64_add(value, &(mm)->_##member)
-#define inc_mm_counter(mm, member) atomic64_inc(&(mm)->_##member)
-#define dec_mm_counter(mm, member) atomic64_dec(&(mm)->_##member)
-typedef atomic64_t mm_counter_t;
-#else /* !ATOMIC64_INIT */
-/*
- * The counters wrap back to 0 at 2^32 * PAGE_SIZE,
- * that is, at 16TB if using 4kB page size.
- */
-#define set_mm_counter(mm, member, value) atomic_set(&(mm)->_##member, value)
-#define get_mm_counter(mm, member) ((unsigned long)atomic_read(&(mm)->_##member))
-#define add_mm_counter(mm, member, value) atomic_add(value, &(mm)->_##member)
-#define inc_mm_counter(mm, member) atomic_inc(&(mm)->_##member)
-#define dec_mm_counter(mm, member) atomic_dec(&(mm)->_##member)
-typedef atomic_t mm_counter_t;
-#endif /* !ATOMIC64_INIT */
+#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
+#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
+#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
+#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
+#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
+typedef atomic_long_t mm_counter_t;
#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
/*
