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NAME	SIZE	ACTIONS
📁 bitops		[ DEL ]
📁 vdso		[ DEL ]
📄 4level-fixup.h	1,098 B	[ EDIT ] \| [ DEL ]
📄 5level-fixup.h	1,273 B	[ EDIT ] \| [ DEL ]
📄 asm-offsets.h	35 B	[ EDIT ] \| [ DEL ]
📄 asm-prototypes.h	507 B	[ EDIT ] \| [ DEL ]
📄 atomic-instrumented.h	13,623 B	[ EDIT ] \| [ DEL ]
📄 atomic-long.h	8,048 B	[ EDIT ] \| [ DEL ]
📄 atomic.h	4,391 B	[ EDIT ] \| [ DEL ]
📄 atomic64.h	1,797 B	[ EDIT ] \| [ DEL ]
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📄 barrier.h	6,868 B	[ EDIT ] \| [ DEL ]
📄 bitops-instrumented.h	7,909 B	[ EDIT ] \| [ DEL ]
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📄 bitsperlong.h	592 B	[ EDIT ] \| [ DEL ]
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📄 cmpxchg-local.h	1,464 B	[ EDIT ] \| [ DEL ]
📄 cmpxchg.h	2,286 B	[ EDIT ] \| [ DEL ]
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📄 extable.h	802 B	[ EDIT ] \| [ DEL ]
📄 fb.h	271 B	[ EDIT ] \| [ DEL ]
📄 fixmap.h	2,904 B	[ EDIT ] \| [ DEL ]
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📄 futex.h	2,964 B	[ EDIT ] \| [ DEL ]
📄 getorder.h	1,487 B	[ EDIT ] \| [ DEL ]
📄 gpio.h	4,558 B	[ EDIT ] \| [ DEL ]
📄 hardirq.h	532 B	[ EDIT ] \| [ DEL ]
📄 hugetlb.h	1,326 B	[ EDIT ] \| [ DEL ]
📄 hw_irq.h	270 B	[ EDIT ] \| [ DEL ]
📄 hyperv-tlfs.h	20,696 B	[ EDIT ] \| [ DEL ]
📄 ide_iops.h	791 B	[ EDIT ] \| [ DEL ]
📄 int-ll64.h	863 B	[ EDIT ] \| [ DEL ]
📄 io.h	24,167 B	[ EDIT ] \| [ DEL ]
📄 ioctl.h	506 B	[ EDIT ] \| [ DEL ]
📄 iomap.h	4,033 B	[ EDIT ] \| [ DEL ]
📄 irq.h	403 B	[ EDIT ] \| [ DEL ]
📄 irq_regs.h	980 B	[ EDIT ] \| [ DEL ]
📄 irq_work.h	194 B	[ EDIT ] \| [ DEL ]
📄 irqflags.h	1,543 B	[ EDIT ] \| [ DEL ]
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📄 pgtable-nop4d-hack.h	1,965 B	[ EDIT ] \| [ DEL ]
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📄 pgtable-nopmd.h	1,944 B	[ EDIT ] \| [ DEL ]
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📄 pgtable.h	33,765 B	[ EDIT ] \| [ DEL ]
📄 pgtable_uffd.h	1,052 B	[ EDIT ] \| [ DEL ]
📄 preempt.h	1,994 B	[ EDIT ] \| [ DEL ]
📄 ptrace.h	1,615 B	[ EDIT ] \| [ DEL ]
📄 qrwlock.h	4,315 B	[ EDIT ] \| [ DEL ]
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📄 qspinlock_types.h	2,590 B	[ EDIT ] \| [ DEL ]
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📄 set_memory.h	362 B	[ EDIT ] \| [ DEL ]
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📄 simd.h	436 B	[ EDIT ] \| [ DEL ]
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📄 string.h	281 B	[ EDIT ] \| [ DEL ]
📄 switch_to.h	962 B	[ EDIT ] \| [ DEL ]
📄 syscall.h	6,389 B	[ EDIT ] \| [ DEL ]
📄 syscalls.h	739 B	[ EDIT ] \| [ DEL ]
📄 termios-base.h	2,164 B	[ EDIT ] \| [ DEL ]
📄 termios.h	2,877 B	[ EDIT ] \| [ DEL ]
📄 timex.h	508 B	[ EDIT ] \| [ DEL ]
📄 tlb.h	19,685 B	[ EDIT ] \| [ DEL ]
📄 tlbflush.h	485 B	[ EDIT ] \| [ DEL ]
📄 topology.h	2,234 B	[ EDIT ] \| [ DEL ]
📄 trace_clock.h	391 B	[ EDIT ] \| [ DEL ]
📄 uaccess.h	5,272 B	[ EDIT ] \| [ DEL ]
📄 unaligned.h	1,078 B	[ EDIT ] \| [ DEL ]
📄 unistd.h	318 B	[ EDIT ] \| [ DEL ]
📄 user.h	242 B	[ EDIT ] \| [ DEL ]
📄 vga.h	587 B	[ EDIT ] \| [ DEL ]
📄 vmlinux.lds.h	28,848 B	[ EDIT ] \| [ DEL ]
📄 vtime.h	52 B	[ EDIT ] \| [ DEL ]
📄 word-at-a-time.h	2,817 B	[ EDIT ] \| [ DEL ]
📄 xor.h	13,961 B	[ EDIT ] \| [ DEL ]

[ CLOSE ]

EDIT: atomic.h

/*
 * Generic C implementation of atomic counter operations. Usable on
 * UP systems only. Do not include in machine independent code.
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef __ASM_GENERIC_ATOMIC_H
#define __ASM_GENERIC_ATOMIC_H

#include <asm/cmpxchg.h>
#include <asm/barrier.h>

/*
 * atomic_$op() - $op integer to atomic variable
 * @i: integer value to $op
 * @v: pointer to the atomic variable
 *
 * Atomically $ops @i to @v. Does not strictly guarantee a memory-barrier, use
 * smp_mb__{before,after}_atomic().
 */

/*
 * atomic_$op_return() - $op interer to atomic variable and returns the result
 * @i: integer value to $op
 * @v: pointer to the atomic variable
 *
 * Atomically $ops @i to @v. Does imply a full memory barrier.
 */

#ifdef CONFIG_SMP

/* we can build all atomic primitives from cmpxchg */

#define ATOMIC_OP(op, c_op)						\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
}

#define ATOMIC_OP_RETURN(op, c_op)					\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
									\
	return c c_op i;						\
}

#define ATOMIC_FETCH_OP(op, c_op)					\
static inline int atomic_fetch_##op(int i, atomic_t *v)			\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
									\
	return c;							\
}

#else

#include <linux/irqflags.h>

#define ATOMIC_OP(op, c_op)						\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	unsigned long flags;						\
									\
	raw_local_irq_save(flags);					\
	v->counter = v->counter c_op i;					\
	raw_local_irq_restore(flags);					\
}

#define ATOMIC_OP_RETURN(op, c_op)					\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	unsigned long flags;						\
	int ret;							\
									\
	raw_local_irq_save(flags);					\
	ret = (v->counter = v->counter c_op i);				\
	raw_local_irq_restore(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;							\
									\
	raw_local_irq_save(flags);					\
	ret = v->counter;						\
	v->counter = v->counter c_op i;					\
	raw_local_irq_restore(flags);					\
									\
	return ret;							\
}

#endif /* CONFIG_SMP */

#ifndef atomic_add_return
ATOMIC_OP_RETURN(add, +)
#endif

#ifndef atomic_sub_return
ATOMIC_OP_RETURN(sub, -)
#endif

#ifndef atomic_fetch_add
ATOMIC_FETCH_OP(add, +)
#endif

#ifndef atomic_fetch_sub
ATOMIC_FETCH_OP(sub, -)
#endif

#ifndef atomic_fetch_and
ATOMIC_FETCH_OP(and, &)
#endif

#ifndef atomic_fetch_or
ATOMIC_FETCH_OP(or, |)
#endif

#ifndef atomic_fetch_xor
ATOMIC_FETCH_OP(xor, ^)
#endif

#ifndef atomic_and
ATOMIC_OP(and, &)
#endif

#ifndef atomic_or
ATOMIC_OP(or, |)
#endif

#ifndef atomic_xor
ATOMIC_OP(xor, ^)
#endif

#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

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

/**
 * atomic_read - read atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically reads the value of @v.
 */
#ifndef atomic_read
#define atomic_read(v)	READ_ONCE((v)->counter)
#endif

/**
 * atomic_set - set atomic variable
 * @v: pointer of type atomic_t
 * @i: required value
 *
 * Atomically sets the value of @v to @i.
 */
#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))

#include <linux/irqflags.h>

static inline void atomic_add(int i, atomic_t *v)
{
	atomic_add_return(i, v);
}

static inline void atomic_sub(int i, atomic_t *v)
{
	atomic_sub_return(i, v);
}

#define atomic_xchg(ptr, v)		(xchg(&(ptr)->counter, (v)))
#define atomic_cmpxchg(v, old, new)	(cmpxchg(&((v)->counter), (old), (new)))

#endif /* __ASM_GENERIC_ATOMIC_H */