move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / linux / atomic64.c

diff --git a/linux/atomic64.c b/linux/atomic64.c
deleted file mode 100644 (file)
index 4654d09..0000000
--- a/linux/atomic64.c
+++ /dev/null
@@ -1,188 +0,0 @@
-/*
- * 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>
-#include <linux/spinlock.h>
-#include <linux/atomic.h>
-
-#ifdef ATOMIC64_SPINLOCK
-
-/*
- * We use a hashed array of spinlocks to provide exclusive access
- * to each atomic64_t variable.  Since this is expected to used on
- * systems with small numbers of CPUs (<= 4 or so), we use a
- * relatively small array of 16 spinlocks to avoid wasting too much
- * memory on the spinlock array.
- */
-#define NR_LOCKS       16
-
-/*
- * Ensure each lock is in a separate cacheline.
- */
-static union {
-       raw_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),
-       },
-};
-
-static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
-{
-       unsigned long addr = (unsigned long) v;
-
-       addr >>= L1_CACHE_SHIFT;
-       addr ^= (addr >> 8) ^ (addr >> 16);
-       return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
-}
-
-long long atomic64_read(const 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;
-       raw_spin_unlock_irqrestore(lock, flags);
-       return val;
-}
-
-void atomic64_set(atomic64_t *v, long long i)
-{
-       unsigned long flags;
-       raw_spinlock_t *lock = lock_addr(v);
-
-       raw_spin_lock_irqsave(lock, flags);
-       v->counter = i;
-       raw_spin_unlock_irqrestore(lock, flags);
-}
-
-#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);                        \
-}
-
-#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;                                                     \
-}
-
-#define ATOMIC64_FETCH_OP(op, c_op)                                    \
-long long atomic64_fetch_##op(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;                                               \
-       v->counter c_op a;                                              \
-       raw_spin_unlock_irqrestore(lock, flags);                        \
-       return val;                                                     \
-}
-
-#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(add, +=)
-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, &=)
-ATOMIC64_OPS(or, |=)
-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)
-{
-       unsigned long flags;
-       raw_spinlock_t *lock = lock_addr(v);
-       long long val;
-
-       raw_spin_lock_irqsave(lock, flags);
-       val = v->counter - 1;
-       if (val >= 0)
-               v->counter = val;
-       raw_spin_unlock_irqrestore(lock, flags);
-       return val;
-}
-
-long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
-{
-       unsigned long flags;
-       raw_spinlock_t *lock = lock_addr(v);
-       long long val;
-
-       raw_spin_lock_irqsave(lock, flags);
-       val = v->counter;
-       if (val == o)
-               v->counter = n;
-       raw_spin_unlock_irqrestore(lock, flags);
-       return val;
-}
-
-long long atomic64_xchg(atomic64_t *v, long long new)
-{
-       unsigned long flags;
-       raw_spinlock_t *lock = lock_addr(v);
-       long long val;
-
-       raw_spin_lock_irqsave(lock, flags);
-       val = v->counter;
-       v->counter = new;
-       raw_spin_unlock_irqrestore(lock, flags);
-       return val;
-}
-
-int atomic64_add_unless(atomic64_t *v, long long a, long long u)
-{
-       unsigned long flags;
-       raw_spinlock_t *lock = lock_addr(v);
-       int ret = 0;
-
-       raw_spin_lock_irqsave(lock, flags);
-       if (v->counter != u) {
-               v->counter += a;
-               ret = 1;
-       }
-       raw_spin_unlock_irqrestore(lock, flags);
-       return ret;
-}
-
-#endif