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-rw-r--r--lib/atomic64.c136
1 files changed, 74 insertions, 62 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c
index 1d91e31eceec..1a72bba36d24 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Generic implementation of 64-bit atomics using spinlocks,
* useful on processors that don't have 64-bit atomic instructions.
*
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
#include <linux/cache.h>
@@ -29,15 +25,15 @@
* Ensure each lock is in a separate cacheline.
*/
static union {
- raw_spinlock_t lock;
+ arch_spinlock_t lock;
char pad[L1_CACHE_BYTES];
} atomic64_lock[NR_LOCKS] __cacheline_aligned_in_smp = {
[0 ... (NR_LOCKS - 1)] = {
- .lock = __RAW_SPIN_LOCK_UNLOCKED(atomic64_lock.lock),
+ .lock = __ARCH_SPIN_LOCK_UNLOCKED,
},
};
-static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
+static inline arch_spinlock_t *lock_addr(const atomic64_t *v)
{
unsigned long addr = (unsigned long) v;
@@ -46,70 +42,80 @@ static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
}
-long long atomic64_read(const atomic64_t *v)
+s64 generic_atomic64_read(const atomic64_t *v)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
+ arch_spinlock_t *lock = lock_addr(v);
+ s64 val;
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
val = v->counter;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
return val;
}
-EXPORT_SYMBOL(atomic64_read);
+EXPORT_SYMBOL(generic_atomic64_read);
-void atomic64_set(atomic64_t *v, long long i)
+void generic_atomic64_set(atomic64_t *v, s64 i)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
+ arch_spinlock_t *lock = lock_addr(v);
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
v->counter = i;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
}
-EXPORT_SYMBOL(atomic64_set);
+EXPORT_SYMBOL(generic_atomic64_set);
#define ATOMIC64_OP(op, c_op) \
-void atomic64_##op(long long a, atomic64_t *v) \
+void generic_atomic64_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
- raw_spinlock_t *lock = lock_addr(v); \
+ arch_spinlock_t *lock = lock_addr(v); \
\
- raw_spin_lock_irqsave(lock, flags); \
+ local_irq_save(flags); \
+ arch_spin_lock(lock); \
v->counter c_op a; \
- raw_spin_unlock_irqrestore(lock, flags); \
+ arch_spin_unlock(lock); \
+ local_irq_restore(flags); \
} \
-EXPORT_SYMBOL(atomic64_##op);
+EXPORT_SYMBOL(generic_atomic64_##op);
#define ATOMIC64_OP_RETURN(op, c_op) \
-long long atomic64_##op##_return(long long a, atomic64_t *v) \
+s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
- raw_spinlock_t *lock = lock_addr(v); \
- long long val; \
+ arch_spinlock_t *lock = lock_addr(v); \
+ s64 val; \
\
- raw_spin_lock_irqsave(lock, flags); \
+ local_irq_save(flags); \
+ arch_spin_lock(lock); \
val = (v->counter c_op a); \
- raw_spin_unlock_irqrestore(lock, flags); \
+ arch_spin_unlock(lock); \
+ local_irq_restore(flags); \
return val; \
} \
-EXPORT_SYMBOL(atomic64_##op##_return);
+EXPORT_SYMBOL(generic_atomic64_##op##_return);
#define ATOMIC64_FETCH_OP(op, c_op) \
-long long atomic64_fetch_##op(long long a, atomic64_t *v) \
+s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v) \
{ \
unsigned long flags; \
- raw_spinlock_t *lock = lock_addr(v); \
- long long val; \
+ arch_spinlock_t *lock = lock_addr(v); \
+ s64 val; \
\
- raw_spin_lock_irqsave(lock, flags); \
+ local_irq_save(flags); \
+ arch_spin_lock(lock); \
val = v->counter; \
v->counter c_op a; \
- raw_spin_unlock_irqrestore(lock, flags); \
+ arch_spin_unlock(lock); \
+ local_irq_restore(flags); \
return val; \
} \
-EXPORT_SYMBOL(atomic64_fetch_##op);
+EXPORT_SYMBOL(generic_atomic64_fetch_##op);
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
@@ -122,7 +128,6 @@ ATOMIC64_OPS(sub, -=)
#undef ATOMIC64_OPS
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
- ATOMIC64_OP_RETURN(op, c_op) \
ATOMIC64_FETCH_OP(op, c_op)
ATOMIC64_OPS(and, &=)
@@ -131,65 +136,72 @@ ATOMIC64_OPS(xor, ^=)
#undef ATOMIC64_OPS
#undef ATOMIC64_FETCH_OP
-#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
-long long atomic64_dec_if_positive(atomic64_t *v)
+s64 generic_atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
+ arch_spinlock_t *lock = lock_addr(v);
+ s64 val;
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
val = v->counter - 1;
if (val >= 0)
v->counter = val;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
return val;
}
-EXPORT_SYMBOL(atomic64_dec_if_positive);
+EXPORT_SYMBOL(generic_atomic64_dec_if_positive);
-long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
+s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
+ arch_spinlock_t *lock = lock_addr(v);
+ s64 val;
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
val = v->counter;
if (val == o)
v->counter = n;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
return val;
}
-EXPORT_SYMBOL(atomic64_cmpxchg);
+EXPORT_SYMBOL(generic_atomic64_cmpxchg);
-long long atomic64_xchg(atomic64_t *v, long long new)
+s64 generic_atomic64_xchg(atomic64_t *v, s64 new)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
+ arch_spinlock_t *lock = lock_addr(v);
+ s64 val;
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
val = v->counter;
v->counter = new;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
return val;
}
-EXPORT_SYMBOL(atomic64_xchg);
+EXPORT_SYMBOL(generic_atomic64_xchg);
-long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u)
+s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
unsigned long flags;
- raw_spinlock_t *lock = lock_addr(v);
- long long val;
+ arch_spinlock_t *lock = lock_addr(v);
+ s64 val;
- raw_spin_lock_irqsave(lock, flags);
+ local_irq_save(flags);
+ arch_spin_lock(lock);
val = v->counter;
if (val != u)
v->counter += a;
- raw_spin_unlock_irqrestore(lock, flags);
+ arch_spin_unlock(lock);
+ local_irq_restore(flags);
return val;
}
-EXPORT_SYMBOL(atomic64_fetch_add_unless);
+EXPORT_SYMBOL(generic_atomic64_fetch_add_unless);
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