arch/arm64/include/asm/atomic.h - linux/kernel/git/viro/vfs - Git at Google

 /*
  * Based on arch/arm/include/asm/atomic.h
  *
  * Copyright (C) 1996 Russell King.
  * Copyright (C) 2002 Deep Blue Solutions Ltd.
  * Copyright (C) 2012 ARM Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #ifndef __ASM_ATOMIC_H
 #define __ASM_ATOMIC_H

 #include <linux/compiler.h>
 #include <linux/types.h>

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

 #ifdef __KERNEL__

 #define __ARM64_IN_ATOMIC_IMPL

 #if defined(CONFIG_ARM64_LSE_ATOMICS) && defined(CONFIG_AS_LSE)
 #include <asm/atomic_lse.h>
 #else
 #include <asm/atomic_ll_sc.h>
 #endif

 #undef __ARM64_IN_ATOMIC_IMPL

 #include <asm/cmpxchg.h>

 #define ___atomic_add_unless(v, a, u, sfx)				\
 ({									\
 	typeof((v)->counter) c, old;					\
 									\
 	c = atomic##sfx##_read(v);					\
 	while (c != (u) &&						\
 	      (old = atomic##sfx##_cmpxchg((v), c, c + (a))) != c)	\
 		c = old;						\
 	c;								\
  })

 #define ATOMIC_INIT(i)	{ (i) }

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

 #define atomic_add_return_relaxed	atomic_add_return_relaxed
 #define atomic_add_return_acquire	atomic_add_return_acquire
 #define atomic_add_return_release	atomic_add_return_release
 #define atomic_add_return		atomic_add_return

 #define atomic_inc_return_relaxed(v)	atomic_add_return_relaxed(1, (v))
 #define atomic_inc_return_acquire(v)	atomic_add_return_acquire(1, (v))
 #define atomic_inc_return_release(v)	atomic_add_return_release(1, (v))
 #define atomic_inc_return(v)		atomic_add_return(1, (v))

 #define atomic_sub_return_relaxed	atomic_sub_return_relaxed
 #define atomic_sub_return_acquire	atomic_sub_return_acquire
 #define atomic_sub_return_release	atomic_sub_return_release
 #define atomic_sub_return		atomic_sub_return

 #define atomic_dec_return_relaxed(v)	atomic_sub_return_relaxed(1, (v))
 #define atomic_dec_return_acquire(v)	atomic_sub_return_acquire(1, (v))
 #define atomic_dec_return_release(v)	atomic_sub_return_release(1, (v))
 #define atomic_dec_return(v)		atomic_sub_return(1, (v))

 #define atomic_fetch_add_relaxed	atomic_fetch_add_relaxed
 #define atomic_fetch_add_acquire	atomic_fetch_add_acquire
 #define atomic_fetch_add_release	atomic_fetch_add_release
 #define atomic_fetch_add		atomic_fetch_add

 #define atomic_fetch_sub_relaxed	atomic_fetch_sub_relaxed
 #define atomic_fetch_sub_acquire	atomic_fetch_sub_acquire
 #define atomic_fetch_sub_release	atomic_fetch_sub_release
 #define atomic_fetch_sub		atomic_fetch_sub

 #define atomic_fetch_and_relaxed	atomic_fetch_and_relaxed
 #define atomic_fetch_and_acquire	atomic_fetch_and_acquire
 #define atomic_fetch_and_release	atomic_fetch_and_release
 #define atomic_fetch_and		atomic_fetch_and

 #define atomic_fetch_andnot_relaxed	atomic_fetch_andnot_relaxed
 #define atomic_fetch_andnot_acquire	atomic_fetch_andnot_acquire
 #define atomic_fetch_andnot_release	atomic_fetch_andnot_release
 #define atomic_fetch_andnot		atomic_fetch_andnot

 #define atomic_fetch_or_relaxed		atomic_fetch_or_relaxed
 #define atomic_fetch_or_acquire		atomic_fetch_or_acquire
 #define atomic_fetch_or_release		atomic_fetch_or_release
 #define atomic_fetch_or			atomic_fetch_or

 #define atomic_fetch_xor_relaxed	atomic_fetch_xor_relaxed
 #define atomic_fetch_xor_acquire	atomic_fetch_xor_acquire
 #define atomic_fetch_xor_release	atomic_fetch_xor_release
 #define atomic_fetch_xor		atomic_fetch_xor

 #define atomic_xchg_relaxed(v, new)	xchg_relaxed(&((v)->counter), (new))
 #define atomic_xchg_acquire(v, new)	xchg_acquire(&((v)->counter), (new))
 #define atomic_xchg_release(v, new)	xchg_release(&((v)->counter), (new))
 #define atomic_xchg(v, new)		xchg(&((v)->counter), (new))

 #define atomic_cmpxchg_relaxed(v, old, new)				\
 	cmpxchg_relaxed(&((v)->counter), (old), (new))
 #define atomic_cmpxchg_acquire(v, old, new)				\
 	cmpxchg_acquire(&((v)->counter), (old), (new))
 #define atomic_cmpxchg_release(v, old, new)				\
 	cmpxchg_release(&((v)->counter), (old), (new))
 #define atomic_cmpxchg(v, old, new)	cmpxchg(&((v)->counter), (old), (new))

 #define atomic_inc(v)			atomic_add(1, (v))
 #define atomic_dec(v)			atomic_sub(1, (v))
 #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_add_negative(i, v)	(atomic_add_return((i), (v)) < 0)
 #define __atomic_add_unless(v, a, u)	___atomic_add_unless(v, a, u,)
 #define atomic_andnot			atomic_andnot

 /*
  * 64-bit atomic operations.
  */
 #define ATOMIC64_INIT			ATOMIC_INIT
 #define atomic64_read			atomic_read
 #define atomic64_set			atomic_set

 #define atomic64_add_return_relaxed	atomic64_add_return_relaxed
 #define atomic64_add_return_acquire	atomic64_add_return_acquire
 #define atomic64_add_return_release	atomic64_add_return_release
 #define atomic64_add_return		atomic64_add_return

 #define atomic64_inc_return_relaxed(v)	atomic64_add_return_relaxed(1, (v))
 #define atomic64_inc_return_acquire(v)	atomic64_add_return_acquire(1, (v))
 #define atomic64_inc_return_release(v)	atomic64_add_return_release(1, (v))
 #define atomic64_inc_return(v)		atomic64_add_return(1, (v))

 #define atomic64_sub_return_relaxed	atomic64_sub_return_relaxed
 #define atomic64_sub_return_acquire	atomic64_sub_return_acquire
 #define atomic64_sub_return_release	atomic64_sub_return_release
 #define atomic64_sub_return		atomic64_sub_return

 #define atomic64_dec_return_relaxed(v)	atomic64_sub_return_relaxed(1, (v))
 #define atomic64_dec_return_acquire(v)	atomic64_sub_return_acquire(1, (v))
 #define atomic64_dec_return_release(v)	atomic64_sub_return_release(1, (v))
 #define atomic64_dec_return(v)		atomic64_sub_return(1, (v))

 #define atomic64_fetch_add_relaxed	atomic64_fetch_add_relaxed
 #define atomic64_fetch_add_acquire	atomic64_fetch_add_acquire
 #define atomic64_fetch_add_release	atomic64_fetch_add_release
 #define atomic64_fetch_add		atomic64_fetch_add

 #define atomic64_fetch_sub_relaxed	atomic64_fetch_sub_relaxed
 #define atomic64_fetch_sub_acquire	atomic64_fetch_sub_acquire
 #define atomic64_fetch_sub_release	atomic64_fetch_sub_release
 #define atomic64_fetch_sub		atomic64_fetch_sub

 #define atomic64_fetch_and_relaxed	atomic64_fetch_and_relaxed
 #define atomic64_fetch_and_acquire	atomic64_fetch_and_acquire
 #define atomic64_fetch_and_release	atomic64_fetch_and_release
 #define atomic64_fetch_and		atomic64_fetch_and

 #define atomic64_fetch_andnot_relaxed	atomic64_fetch_andnot_relaxed
 #define atomic64_fetch_andnot_acquire	atomic64_fetch_andnot_acquire
 #define atomic64_fetch_andnot_release	atomic64_fetch_andnot_release
 #define atomic64_fetch_andnot		atomic64_fetch_andnot

 #define atomic64_fetch_or_relaxed	atomic64_fetch_or_relaxed
 #define atomic64_fetch_or_acquire	atomic64_fetch_or_acquire
 #define atomic64_fetch_or_release	atomic64_fetch_or_release
 #define atomic64_fetch_or		atomic64_fetch_or

 #define atomic64_fetch_xor_relaxed	atomic64_fetch_xor_relaxed
 #define atomic64_fetch_xor_acquire	atomic64_fetch_xor_acquire
 #define atomic64_fetch_xor_release	atomic64_fetch_xor_release
 #define atomic64_fetch_xor		atomic64_fetch_xor

 #define atomic64_xchg_relaxed		atomic_xchg_relaxed
 #define atomic64_xchg_acquire		atomic_xchg_acquire
 #define atomic64_xchg_release		atomic_xchg_release
 #define atomic64_xchg			atomic_xchg

 #define atomic64_cmpxchg_relaxed	atomic_cmpxchg_relaxed
 #define atomic64_cmpxchg_acquire	atomic_cmpxchg_acquire
 #define atomic64_cmpxchg_release	atomic_cmpxchg_release
 #define atomic64_cmpxchg		atomic_cmpxchg

 #define atomic64_inc(v)			atomic64_add(1, (v))
 #define atomic64_dec(v)			atomic64_sub(1, (v))
 #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)
 #define atomic64_add_negative(i, v)	(atomic64_add_return((i), (v)) < 0)
 #define atomic64_add_unless(v, a, u)	(___atomic_add_unless(v, a, u, 64) != u)
 #define atomic64_andnot			atomic64_andnot

 #define atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1, 0)

 #endif
 #endif
	/*
	* Based on arch/arm/include/asm/atomic.h
	*
	* Copyright (C) 1996 Russell King.
	* Copyright (C) 2002 Deep Blue Solutions Ltd.
	* Copyright (C) 2012 ARM Ltd.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/
	#ifndef __ASM_ATOMIC_H
	#define __ASM_ATOMIC_H

	#include <linux/compiler.h>
	#include <linux/types.h>

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

	#ifdef __KERNEL__

	#define __ARM64_IN_ATOMIC_IMPL

	#if defined(CONFIG_ARM64_LSE_ATOMICS) && defined(CONFIG_AS_LSE)
	#include <asm/atomic_lse.h>
	#else
	#include <asm/atomic_ll_sc.h>
	#endif

	#undef __ARM64_IN_ATOMIC_IMPL

	#include <asm/cmpxchg.h>

	#define ___atomic_add_unless(v, a, u, sfx) \
	({ \
	typeof((v)->counter) c, old; \
	\
	c = atomic##sfx##_read(v); \
	while (c != (u) && \
	(old = atomic##sfx##_cmpxchg((v), c, c + (a))) != c) \
	c = old; \
	c; \
	})

	#define ATOMIC_INIT(i) { (i) }

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

	#define atomic_add_return_relaxed atomic_add_return_relaxed
	#define atomic_add_return_acquire atomic_add_return_acquire
	#define atomic_add_return_release atomic_add_return_release
	#define atomic_add_return atomic_add_return

	#define atomic_inc_return_relaxed(v) atomic_add_return_relaxed(1, (v))
	#define atomic_inc_return_acquire(v) atomic_add_return_acquire(1, (v))
	#define atomic_inc_return_release(v) atomic_add_return_release(1, (v))
	#define atomic_inc_return(v) atomic_add_return(1, (v))

	#define atomic_sub_return_relaxed atomic_sub_return_relaxed
	#define atomic_sub_return_acquire atomic_sub_return_acquire
	#define atomic_sub_return_release atomic_sub_return_release
	#define atomic_sub_return atomic_sub_return

	#define atomic_dec_return_relaxed(v) atomic_sub_return_relaxed(1, (v))
	#define atomic_dec_return_acquire(v) atomic_sub_return_acquire(1, (v))
	#define atomic_dec_return_release(v) atomic_sub_return_release(1, (v))
	#define atomic_dec_return(v) atomic_sub_return(1, (v))

	#define atomic_fetch_add_relaxed atomic_fetch_add_relaxed
	#define atomic_fetch_add_acquire atomic_fetch_add_acquire
	#define atomic_fetch_add_release atomic_fetch_add_release
	#define atomic_fetch_add atomic_fetch_add

	#define atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed
	#define atomic_fetch_sub_acquire atomic_fetch_sub_acquire
	#define atomic_fetch_sub_release atomic_fetch_sub_release
	#define atomic_fetch_sub atomic_fetch_sub

	#define atomic_fetch_and_relaxed atomic_fetch_and_relaxed
	#define atomic_fetch_and_acquire atomic_fetch_and_acquire
	#define atomic_fetch_and_release atomic_fetch_and_release
	#define atomic_fetch_and atomic_fetch_and

	#define atomic_fetch_andnot_relaxed atomic_fetch_andnot_relaxed
	#define atomic_fetch_andnot_acquire atomic_fetch_andnot_acquire
	#define atomic_fetch_andnot_release atomic_fetch_andnot_release
	#define atomic_fetch_andnot atomic_fetch_andnot

	#define atomic_fetch_or_relaxed atomic_fetch_or_relaxed
	#define atomic_fetch_or_acquire atomic_fetch_or_acquire
	#define atomic_fetch_or_release atomic_fetch_or_release
	#define atomic_fetch_or atomic_fetch_or

	#define atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed
	#define atomic_fetch_xor_acquire atomic_fetch_xor_acquire
	#define atomic_fetch_xor_release atomic_fetch_xor_release
	#define atomic_fetch_xor atomic_fetch_xor

	#define atomic_xchg_relaxed(v, new) xchg_relaxed(&((v)->counter), (new))
	#define atomic_xchg_acquire(v, new) xchg_acquire(&((v)->counter), (new))
	#define atomic_xchg_release(v, new) xchg_release(&((v)->counter), (new))
	#define atomic_xchg(v, new) xchg(&((v)->counter), (new))

	#define atomic_cmpxchg_relaxed(v, old, new) \
	cmpxchg_relaxed(&((v)->counter), (old), (new))
	#define atomic_cmpxchg_acquire(v, old, new) \
	cmpxchg_acquire(&((v)->counter), (old), (new))
	#define atomic_cmpxchg_release(v, old, new) \
	cmpxchg_release(&((v)->counter), (old), (new))
	#define atomic_cmpxchg(v, old, new) cmpxchg(&((v)->counter), (old), (new))

	#define atomic_inc(v) atomic_add(1, (v))
	#define atomic_dec(v) atomic_sub(1, (v))
	#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_add_negative(i, v) (atomic_add_return((i), (v)) < 0)
	#define __atomic_add_unless(v, a, u) ___atomic_add_unless(v, a, u,)
	#define atomic_andnot atomic_andnot

	/*
	* 64-bit atomic operations.
	*/
	#define ATOMIC64_INIT ATOMIC_INIT
	#define atomic64_read atomic_read
	#define atomic64_set atomic_set

	#define atomic64_add_return_relaxed atomic64_add_return_relaxed
	#define atomic64_add_return_acquire atomic64_add_return_acquire
	#define atomic64_add_return_release atomic64_add_return_release
	#define atomic64_add_return atomic64_add_return

	#define atomic64_inc_return_relaxed(v) atomic64_add_return_relaxed(1, (v))
	#define atomic64_inc_return_acquire(v) atomic64_add_return_acquire(1, (v))
	#define atomic64_inc_return_release(v) atomic64_add_return_release(1, (v))
	#define atomic64_inc_return(v) atomic64_add_return(1, (v))

	#define atomic64_sub_return_relaxed atomic64_sub_return_relaxed
	#define atomic64_sub_return_acquire atomic64_sub_return_acquire
	#define atomic64_sub_return_release atomic64_sub_return_release
	#define atomic64_sub_return atomic64_sub_return

	#define atomic64_dec_return_relaxed(v) atomic64_sub_return_relaxed(1, (v))
	#define atomic64_dec_return_acquire(v) atomic64_sub_return_acquire(1, (v))
	#define atomic64_dec_return_release(v) atomic64_sub_return_release(1, (v))
	#define atomic64_dec_return(v) atomic64_sub_return(1, (v))

	#define atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed
	#define atomic64_fetch_add_acquire atomic64_fetch_add_acquire
	#define atomic64_fetch_add_release atomic64_fetch_add_release
	#define atomic64_fetch_add atomic64_fetch_add

	#define atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed
	#define atomic64_fetch_sub_acquire atomic64_fetch_sub_acquire
	#define atomic64_fetch_sub_release atomic64_fetch_sub_release
	#define atomic64_fetch_sub atomic64_fetch_sub

	#define atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed
	#define atomic64_fetch_and_acquire atomic64_fetch_and_acquire
	#define atomic64_fetch_and_release atomic64_fetch_and_release
	#define atomic64_fetch_and atomic64_fetch_and

	#define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot_relaxed
	#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot_acquire
	#define atomic64_fetch_andnot_release atomic64_fetch_andnot_release
	#define atomic64_fetch_andnot atomic64_fetch_andnot

	#define atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed
	#define atomic64_fetch_or_acquire atomic64_fetch_or_acquire
	#define atomic64_fetch_or_release atomic64_fetch_or_release
	#define atomic64_fetch_or atomic64_fetch_or

	#define atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed
	#define atomic64_fetch_xor_acquire atomic64_fetch_xor_acquire
	#define atomic64_fetch_xor_release atomic64_fetch_xor_release
	#define atomic64_fetch_xor atomic64_fetch_xor

	#define atomic64_xchg_relaxed atomic_xchg_relaxed
	#define atomic64_xchg_acquire atomic_xchg_acquire
	#define atomic64_xchg_release atomic_xchg_release
	#define atomic64_xchg atomic_xchg

	#define atomic64_cmpxchg_relaxed atomic_cmpxchg_relaxed
	#define atomic64_cmpxchg_acquire atomic_cmpxchg_acquire
	#define atomic64_cmpxchg_release atomic_cmpxchg_release
	#define atomic64_cmpxchg atomic_cmpxchg

	#define atomic64_inc(v) atomic64_add(1, (v))
	#define atomic64_dec(v) atomic64_sub(1, (v))
	#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)
	#define atomic64_add_negative(i, v) (atomic64_add_return((i), (v)) < 0)
	#define atomic64_add_unless(v, a, u) (___atomic_add_unless(v, a, u, 64) != u)
	#define atomic64_andnot atomic64_andnot

	#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

	#endif
	#endif