aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-13 15:48:00 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-13 15:48:00 +0200
commitdbb885fecc1b1b35e93416bedd24d21bd20f60ed (patch)
tree9aa92bcc4e3d3594eba0ba85d72b878d85f35a59 /lib
parentd6dd50e07c5bec00db2005969b1a01f8ca3d25ef (diff)
parent2291059c852706c6f5ffb400366042b7625066cd (diff)
Merge branch 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull arch atomic cleanups from Ingo Molnar: "This is a series kept separate from the main locking tree, which cleans up and improves various details in the atomics type handling: - Remove the unused atomic_or_long() method - Consolidate and compress atomic ops implementations between architectures, to reduce linecount and to make it easier to add new ops. - Rewrite generic atomic support to only require cmpxchg() from an architecture - generate all other methods from that" * 'locking-arch-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() locking, mips: Fix atomics locking, sparc64: Fix atomics locking,arch: Rewrite generic atomic support locking,arch,xtensa: Fold atomic_ops locking,arch,sparc: Fold atomic_ops locking,arch,sh: Fold atomic_ops locking,arch,powerpc: Fold atomic_ops locking,arch,parisc: Fold atomic_ops locking,arch,mn10300: Fold atomic_ops locking,arch,mips: Fold atomic_ops locking,arch,metag: Fold atomic_ops locking,arch,m68k: Fold atomic_ops locking,arch,m32r: Fold atomic_ops locking,arch,ia64: Fold atomic_ops locking,arch,hexagon: Fold atomic_ops locking,arch,cris: Fold atomic_ops locking,arch,avr32: Fold atomic_ops locking,arch,arm64: Fold atomic_ops locking,arch,arm: Fold atomic_ops ...
Diffstat (limited to 'lib')
-rw-r--r--lib/atomic64.c83
1 files changed, 36 insertions, 47 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c
index 08a4f068e61e..1298c05ef528 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -70,53 +70,42 @@ void atomic64_set(atomic64_t *v, long long i)
}
EXPORT_SYMBOL(atomic64_set);
-void atomic64_add(long long a, atomic64_t *v)
-{
- unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
-
- raw_spin_lock_irqsave(lock, flags);
- v->counter += a;
- raw_spin_unlock_irqrestore(lock, flags);
-}
-EXPORT_SYMBOL(atomic64_add);
-
-long long atomic64_add_return(long long a, atomic64_t *v)
-{
- unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
-
- raw_spin_lock_irqsave(lock, flags);
- val = v->counter += a;
- raw_spin_unlock_irqrestore(lock, flags);
- return val;
-}
-EXPORT_SYMBOL(atomic64_add_return);
-
-void atomic64_sub(long long a, atomic64_t *v)
-{
- unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
-
- raw_spin_lock_irqsave(lock, flags);
- v->counter -= a;
- raw_spin_unlock_irqrestore(lock, flags);
-}
-EXPORT_SYMBOL(atomic64_sub);
-
-long long atomic64_sub_return(long long a, atomic64_t *v)
-{
- unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
-
- raw_spin_lock_irqsave(lock, flags);
- val = v->counter -= a;
- raw_spin_unlock_irqrestore(lock, flags);
- return val;
-}
-EXPORT_SYMBOL(atomic64_sub_return);
+#define ATOMIC64_OP(op, c_op) \
+void atomic64_##op(long long a, atomic64_t *v) \
+{ \
+ unsigned long flags; \
+ raw_spinlock_t *lock = lock_addr(v); \
+ \
+ raw_spin_lock_irqsave(lock, flags); \
+ v->counter c_op a; \
+ raw_spin_unlock_irqrestore(lock, flags); \
+} \
+EXPORT_SYMBOL(atomic64_##op);
+
+#define ATOMIC64_OP_RETURN(op, c_op) \
+long long atomic64_##op##_return(long long a, atomic64_t *v) \
+{ \
+ unsigned long flags; \
+ raw_spinlock_t *lock = lock_addr(v); \
+ long long val; \
+ \
+ raw_spin_lock_irqsave(lock, flags); \
+ val = (v->counter c_op a); \
+ raw_spin_unlock_irqrestore(lock, flags); \
+ return val; \
+} \
+EXPORT_SYMBOL(atomic64_##op##_return);
+
+#define ATOMIC64_OPS(op, c_op) \
+ ATOMIC64_OP(op, c_op) \
+ ATOMIC64_OP_RETURN(op, c_op)
+
+ATOMIC64_OPS(add, +=)
+ATOMIC64_OPS(sub, -=)
+
+#undef ATOMIC64_OPS
+#undef ATOMIC64_OP_RETURN
+#undef ATOMIC64_OP
long long atomic64_dec_if_positive(atomic64_t *v)
{

Privacy Policy