Release 4.14 arch/sh/include/asm/atomic.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_ATOMIC_H

#define __ASM_SH_ATOMIC_H

#if defined(CONFIG_CPU_J2)

#include <asm-generic/atomic.h>

#else

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 */

#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>


#define ATOMIC_INIT(i)	{ (i) }


#define atomic_read(v)		READ_ONCE((v)->counter)

#define atomic_set(v,i)		WRITE_ONCE((v)->counter, (i))

#if defined(CONFIG_GUSA_RB)
#include <asm/atomic-grb.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/atomic-llsc.h>
#else
#include <asm/atomic-irq.h>
#endif


#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

#define atomic_dec_return(v)		atomic_sub_return(1, (v))

#define atomic_inc_return(v)		atomic_add_return(1, (v))

#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)

#define atomic_sub_and_test(i,v)	(atomic_sub_return((i), (v)) == 0)

#define atomic_dec_and_test(v)		(atomic_sub_return(1, (v)) == 0)


#define atomic_inc(v)			atomic_add(1, (v))

#define atomic_dec(v)			atomic_sub(1, (v))


#define atomic_xchg(v, new)		(xchg(&((v)->counter), new))

#define atomic_cmpxchg(v, o, n)		(cmpxchg(&((v)->counter), (o), (n)))

/**
 * __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
Paul Mundt
48
58.54%
1
33.33%
Nicholas Piggin
33
40.24%
1
33.33%
Arun Sharma
1
1.22%
1
33.33%
Total
82
100.00%
3
100.00%

#endif /* CONFIG_CPU_J2 */

#endif /* __ASM_SH_ATOMIC_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Mundt
77
31.05%
3
17.65%
Linus Torvalds (pre-git)
70
28.23%
1
5.88%
Nicholas Piggin
39
15.73%
2
11.76%
Andrew Morton
16
6.45%
2
11.76%
Stuart Menefy
14
5.65%
1
5.88%
Rich Felker
14
5.65%
1
5.88%
Matthew Wilcox
8
3.23%
1
5.88%
Peter Zijlstra
5
2.02%
2
11.76%
Arun Sharma
2
0.81%
1
5.88%
Greg Kroah-Hartman
1
0.40%
1
5.88%
David Howells
1
0.40%
1
5.88%
Nobuhiro Iwamatsu
1
0.40%
1
5.88%
Total
248
100.00%
17
100.00%
Directory: arch/sh/include/asm

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