Release 4.14 arch/parisc/include/asm/atomic.h
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
*/
#ifndef _ASM_PARISC_ATOMIC_H_
#define _ASM_PARISC_ATOMIC_H_
#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*
* And probably incredibly slow on parisc. OTOH, we don't
* have to write any serious assembly. prumpf
*/
#ifdef CONFIG_SMP
#include <asm/spinlock.h>
#include <asm/cache.h> /* we use L1_CACHE_BYTES */
/* Use an array of spinlocks for our atomic_ts.
* Hash function to index into a different SPINLOCK.
* Since "a" is usually an address, use one spinlock per cacheline.
*/
# define ATOMIC_HASH_SIZE 4
# define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))
extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
/* Can't use raw_spin_lock_irq because of #include problems, so
* this is the substitute */
#define _atomic_spin_lock_irqsave(l,f) do { \
arch_spinlock_t *s = ATOMIC_HASH(l); \
local_irq_save(f); \
arch_spin_lock(s); \
} while(0)
#define _atomic_spin_unlock_irqrestore(l,f) do { \
arch_spinlock_t *s = ATOMIC_HASH(l); \
arch_spin_unlock(s); \
local_irq_restore(f); \
} while(0)
#else
# define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
#endif
/*
* Note that we need not lock read accesses - aligned word writes/reads
* are atomic, so a reader never sees inconsistent values.
*/
static __inline__ void atomic_set(atomic_t *v, int i)
{
unsigned long flags;
_atomic_spin_lock_irqsave(v, flags);
v->counter = i;
_atomic_spin_unlock_irqrestore(v, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 35 | 92.11% | 1 | 33.33% |
| Matthew Wilcox | 3 | 7.89% | 2 | 66.67% |
| Total | 38 | 100.00% | 3 | 100.00% |
#define atomic_set_release(v, i) atomic_set((v), (i))
static __inline__ int atomic_read(const atomic_t *v)
{
return READ_ONCE((v)->counter);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 15 | 68.18% | 1 | 20.00% |
| Matthew Wilcox | 2 | 9.09% | 1 | 20.00% |
| Pranith Kumar | 2 | 9.09% | 1 | 20.00% |
| Anton Blanchard | 2 | 9.09% | 1 | 20.00% |
| Peter Zijlstra | 1 | 4.55% | 1 | 20.00% |
| Total | 22 | 100.00% | 5 | 100.00% |
/* exported interface */
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns the old value of @v.
*/
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
for (;;) {
if (unlikely(c == (u)))
break;
old = atomic_cmpxchg((v), c, c + (a));
if (likely(old == c))
break;
c = old;
}
return c;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mathieu Desnoyers | 74 | 90.24% | 1 | 33.33% |
| Nicholas Piggin | 7 | 8.54% | 1 | 33.33% |
| Arun Sharma | 1 | 1.22% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
#define ATOMIC_OP(op, c_op) \
static __inline__ void atomic_##op(int i, atomic_t *v) \
{ \
unsigned long flags; \
\
_atomic_spin_lock_irqsave(v, flags); \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
} \
#define ATOMIC_OP_RETURN(op, c_op) \
static __inline__ int atomic_##op##_return(int i, atomic_t *v) \
{ \
unsigned long flags; \
int ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = (v->counter c_op i); \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC_FETCH_OP(op, c_op) \
static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \
{ \
unsigned long flags; \
int ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = v->counter; \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC_OPS(op, c_op) \
ATOMIC_OP(op, c_op) \
ATOMIC_OP_RETURN(op, c_op) \
ATOMIC_FETCH_OP(op, c_op)
ATOMIC_OPS(add, +=)
ATOMIC_OPS(sub, -=)
#undef ATOMIC_OPS
#define ATOMIC_OPS(op, c_op) \
ATOMIC_OP(op, c_op) \
ATOMIC_FETCH_OP(op, c_op)
ATOMIC_OPS(and, &=)
ATOMIC_OPS(or, |=)
ATOMIC_OPS(xor, ^=)
#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
#define atomic_inc(v) (atomic_add( 1,(v)))
#define atomic_dec(v) (atomic_add( -1,(v)))
#define atomic_inc_return(v) (atomic_add_return( 1,(v)))
#define atomic_dec_return(v) (atomic_add_return( -1,(v)))
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
/*
* atomic_inc_and_test - increment and test
* @v: pointer of type atomic_t
*
* Atomically increments @v by 1
* and returns true if the result is zero, or false for all
* other cases.
*/
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
#define atomic_sub_and_test(i,v) (atomic_sub_return((i),(v)) == 0)
#define ATOMIC_INIT(i) { (i) }
#ifdef CONFIG_64BIT
#define ATOMIC64_INIT(i) { (i) }
#define ATOMIC64_OP(op, c_op) \
static __inline__ void atomic64_##op(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
\
_atomic_spin_lock_irqsave(v, flags); \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
} \
#define ATOMIC64_OP_RETURN(op, c_op) \
static __inline__ s64 atomic64_##op##_return(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
s64 ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = (v->counter c_op i); \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC64_FETCH_OP(op, c_op) \
static __inline__ s64 atomic64_fetch_##op(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
s64 ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = v->counter; \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#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_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
static __inline__ void
atomic64_set(atomic64_t *v, s64 i)
{
unsigned long flags;
_atomic_spin_lock_irqsave(v, flags);
v->counter = i;
_atomic_spin_unlock_irqrestore(v, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kyle McMartin | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
static __inline__ s64
atomic64_read(const atomic64_t *v)
{
return ACCESS_ONCE((v)->counter);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kyle McMartin | 17 | 77.27% | 1 | 33.33% |
| Pranith Kumar | 3 | 13.64% | 1 | 33.33% |
| Anton Blanchard | 2 | 9.09% | 1 | 33.33% |
| Total | 22 | 100.00% | 3 | 100.00% |
#define atomic64_inc(v) (atomic64_add( 1,(v)))
#define atomic64_dec(v) (atomic64_add( -1,(v)))
#define atomic64_inc_return(v) (atomic64_add_return( 1,(v)))
#define atomic64_dec_return(v) (atomic64_add_return( -1,(v)))
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
#define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0)
#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i),(v)) == 0)
/* exported interface */
#define atomic64_cmpxchg(v, o, n) \
((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic64_add_unless - add unless the number is a given value
* @v: pointer of type atomic64_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
long c, old;
c = atomic64_read(v);
for (;;) {
if (unlikely(c == (u)))
break;
old = atomic64_cmpxchg((v), c, c + (a));
if (likely(old == c))
break;
c = old;
}
return c != (u);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mathieu Desnoyers | 86 | 100.00% | 2 | 100.00% |
| Total | 86 | 100.00% | 2 | 100.00% |
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
/*
* atomic64_dec_if_positive - decrement by 1 if old value positive
* @v: pointer of type atomic_t
*
* The function returns the old value of *v minus 1, even if
* the atomic variable, v, was not decremented.
*/
static inline long atomic64_dec_if_positive(atomic64_t *v)
{
long c, old, dec;
c = atomic64_read(v);
for (;;) {
dec = c - 1;
if (unlikely(dec < 0))
break;
old = atomic64_cmpxchg((v), c, dec);
if (likely(old == c))
break;
c = old;
}
return dec;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Helge Deller | 78 | 100.00% | 1 | 100.00% |
| Total | 78 | 100.00% | 1 | 100.00% |
#endif /* !CONFIG_64BIT */
#endif /* _ASM_PARISC_ATOMIC_H_ */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mathieu Desnoyers | 190 | 22.84% | 2 | 5.88% |
| Peter Zijlstra | 172 | 20.67% | 6 | 17.65% |
| Linus Torvalds (pre-git) | 145 | 17.43% | 1 | 2.94% |
| Kyle McMartin | 143 | 17.19% | 3 | 8.82% |
| Helge Deller | 80 | 9.62% | 2 | 5.88% |
| Matthew Wilcox | 36 | 4.33% | 5 | 14.71% |
| Nicholas Piggin | 17 | 2.04% | 2 | 5.88% |
| Andrew Morton | 17 | 2.04% | 2 | 5.88% |
| Ingo Molnar | 10 | 1.20% | 2 | 5.88% |
| Pranith Kumar | 5 | 0.60% | 1 | 2.94% |
| Anton Blanchard | 4 | 0.48% | 1 | 2.94% |
| Thomas Gleixner | 3 | 0.36% | 2 | 5.88% |
| Arun Sharma | 3 | 0.36% | 1 | 2.94% |
| Paul Gortmaker | 3 | 0.36% | 1 | 2.94% |
| Mel Gorman | 2 | 0.24% | 1 | 2.94% |
| Greg Kroah-Hartman | 1 | 0.12% | 1 | 2.94% |
| James Bottomley | 1 | 0.12% | 1 | 2.94% |
| Total | 832 | 100.00% | 34 | 100.00% |
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