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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_LOCAL_H
#define _ASM_GENERIC_LOCAL_H

#include <linux/percpu.h>
#include <linux/atomic.h>
#include <asm/types.h>

/*
 * A signed long type for operations which are atomic for a single CPU.
 * Usually used in combination with per-cpu variables.
 *
 * This is the default implementation, which uses atomic_long_t.  Which is
 * rather pointless.  The whole point behind local_t is that some processors
 * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
 * running on this CPU.  local_t allows exploitation of such capabilities.
 */

/* Implement in terms of atomics. */

/* Don't use typedef: don't want them to be mixed with atomic_t's. */
typedef struct
{
	atomic_long_t a;
} local_t;

#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }

#define local_read(l)	atomic_long_read(&(l)->a)
#define local_set(l,i)	atomic_long_set((&(l)->a),(i))
#define local_inc(l)	atomic_long_inc(&(l)->a)
#define local_dec(l)	atomic_long_dec(&(l)->a)
#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))

#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
#define local_inc_return(l) atomic_long_inc_return(&(l)->a)

#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)

/* Non-atomic variants, ie. preemption disabled and won't be touched
 * in interrupt, etc.  Some archs can optimize this case well. */
#define __local_inc(l)		local_set((l), local_read(l) + 1)
#define __local_dec(l)		local_set((l), local_read(l) - 1)
#define __local_add(i,l)	local_set((l), local_read(l) + (i))
#define __local_sub(i,l)	local_set((l), local_read(l) - (i))

#endif /* _ASM_GENERIC_LOCAL_H */

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Name Type Size Permission Actions
bitops Folder 0755
4level-fixup.h File 1.07 KB 0644
5level-fixup.h File 1.15 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 507 B 0644
atomic-long.h File 7.09 KB 0644
atomic.h File 5.11 KB 0644
atomic64.h File 2.26 KB 0644
audit_change_attr.h File 484 B 0644
audit_dir_write.h File 500 B 0644
audit_read.h File 241 B 0644
audit_signal.h File 36 B 0644
audit_write.h File 461 B 0644
barrier.h File 6.01 KB 0644
bitops.h File 1.09 KB 0644
bitsperlong.h File 592 B 0644
bug.h File 6.6 KB 0644
bugs.h File 267 B 0644
cache.h File 384 B 0644
cacheflush.h File 1.31 KB 0644
checksum.h File 2.27 KB 0644
clkdev.h File 706 B 0644
cmpxchg-local.h File 1.43 KB 0644
cmpxchg.h File 2.23 KB 0644
current.h File 256 B 0644
delay.h File 1.13 KB 0644
device.h File 245 B 0644
div64.h File 7.28 KB 0644
dma-contiguous.h File 238 B 0644
dma.h File 553 B 0644
early_ioremap.h File 1.66 KB 0644
emergency-restart.h File 248 B 0644
exec.h File 697 B 0644
export.h File 2.2 KB 0644
extable.h File 802 B 0644
fb.h File 271 B 0644
fixmap.h File 2.84 KB 0644
ftrace.h File 460 B 0644
futex.h File 2.88 KB 0644
getorder.h File 1.22 KB 0644
gpio.h File 4.45 KB 0644
hardirq.h File 532 B 0644
hugetlb.h File 845 B 0644
hw_irq.h File 270 B 0644
ide_iops.h File 791 B 0644
int-ll64.h File 932 B 0644
io.h File 20.39 KB 0644
ioctl.h File 506 B 0644
iomap.h File 3.16 KB 0644
irq.h File 403 B 0644
irq_regs.h File 980 B 0644
irq_work.h File 194 B 0644
irqflags.h File 1.51 KB 0644
kdebug.h File 182 B 0644
kmap_types.h File 198 B 0644
kprobes.h File 868 B 0644
kvm_para.h File 480 B 0644
linkage.h File 225 B 0644
local.h File 2.23 KB 0644
local64.h File 3.8 KB 0644
mcs_spinlock.h File 260 B 0644
memory_model.h File 2.16 KB 0644
mm-arch-hooks.h File 388 B 0644
mm_hooks.h File 885 B 0644
mmu.h File 449 B 0644
mmu_context.h File 881 B 0644
module.h File 1.09 KB 0644
msi.h File 838 B 0644
page.h File 2.4 KB 0644
param.h File 367 B 0644
parport.h File 604 B 0644
pci.h File 581 B 0644
pci_iomap.h File 1.96 KB 0644
percpu.h File 12.72 KB 0644
pgalloc.h File 342 B 0644
pgtable-nop4d-hack.h File 1.86 KB 0644
pgtable-nop4d.h File 1.64 KB 0644
pgtable-nopmd.h File 1.9 KB 0644
pgtable-nopud.h File 1.97 KB 0644
pgtable.h File 29.5 KB 0644
preempt.h File 1.94 KB 0644
ptrace.h File 1.58 KB 0644
qrwlock.h File 3.78 KB 0644
qrwlock_types.h File 655 B 0644
qspinlock.h File 3.67 KB 0644
qspinlock_types.h File 2.77 KB 0644
resource.h File 1.07 KB 0644
rwsem.h File 3.21 KB 0644
seccomp.h File 1.3 KB 0644
sections.h File 4.8 KB 0644
segment.h File 249 B 0644
serial.h File 345 B 0644
set_memory.h File 362 B 0644
signal.h File 308 B 0644
simd.h File 436 B 0644
sizes.h File 78 B 0644
spinlock.h File 329 B 0644
statfs.h File 169 B 0644
string.h File 281 B 0644
switch_to.h File 992 B 0644
syscall.h File 6.18 KB 0644
syscalls.h File 739 B 0644
termios-base.h File 2.11 KB 0644
termios.h File 2.81 KB 0644
timex.h File 508 B 0644
tlb.h File 9.4 KB 0644
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topology.h File 2.18 KB 0644
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uaccess.h File 5.22 KB 0644
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vga.h File 587 B 0644
vmlinux.lds.h File 29.17 KB 0644
vtime.h File 52 B 0644
word-at-a-time.h File 2.75 KB 0644
xor.h File 13.63 KB 0644