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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H
#define __ASM_GENERIC_CMPXCHG_LOCAL_H
#include <linux/types.h>
#include <linux/irqflags.h>
extern unsigned long wrong_size_cmpxchg(volatile void *ptr)
__noreturn;
/*
* Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned
* long parameter, supporting various types of architectures.
*/
static inline unsigned long __generic_cmpxchg_local(volatile void *ptr,
unsigned long old, unsigned long new, int size)
{
unsigned long flags, prev;
/*
* Sanity checking, compile-time.
*/
if (size == 8 && sizeof(unsigned long) != 8)
wrong_size_cmpxchg(ptr);
raw_local_irq_save(flags);
switch (size) {
case 1: prev = *(u8 *)ptr;
if (prev == old)
*(u8 *)ptr = (u8)new;
break;
case 2: prev = *(u16 *)ptr;
if (prev == old)
*(u16 *)ptr = (u16)new;
break;
case 4: prev = *(u32 *)ptr;
if (prev == old)
*(u32 *)ptr = (u32)new;
break;
case 8: prev = *(u64 *)ptr;
if (prev == old)
*(u64 *)ptr = (u64)new;
break;
default:
wrong_size_cmpxchg(ptr);
}
raw_local_irq_restore(flags);
return prev;
}
/*
* Generic version of __cmpxchg64_local. Takes an u64 parameter.
*/
static inline u64 __generic_cmpxchg64_local(volatile void *ptr,
u64 old, u64 new)
{
u64 prev;
unsigned long flags;
raw_local_irq_save(flags);
prev = *(u64 *)ptr;
if (prev == old)
*(u64 *)ptr = new;
raw_local_irq_restore(flags);
return prev;
}
#endif
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| bitops | Folder | 0755 |
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| vdso | Folder | 0755 |
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| Kbuild | File | 1.68 KB | 0644 |
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| access_ok.h | File | 1.37 KB | 0644 |
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| archrandom.h | File | 342 B | 0644 |
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| asm-offsets.h | File | 35 B | 0644 |
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| atomic.h | File | 3.49 KB | 0644 |
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| atomic64.h | File | 2.49 KB | 0644 |
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| audit_change_attr.h | File | 484 B | 0644 |
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| barrier.h | File | 7.13 KB | 0644 |
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| bitops.h | File | 1.13 KB | 0644 |
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| cacheflush.h | File | 2.51 KB | 0644 |
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| cfi.h | File | 129 B | 0644 |
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| checksum.h | File | 1.6 KB | 0644 |
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| cmpxchg-local.h | File | 1.43 KB | 0644 |
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| cmpxchg.h | File | 2.38 KB | 0644 |
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| compat.h | File | 3.67 KB | 0644 |
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| current.h | File | 256 B | 0644 |
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| delay.h | File | 1.13 KB | 0644 |
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| device.h | File | 245 B | 0644 |
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| div64.h | File | 7.48 KB | 0644 |
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| dma-mapping.h | File | 232 B | 0644 |
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| dma.h | File | 553 B | 0644 |
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| early_ioremap.h | File | 1.47 KB | 0644 |
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| emergency-restart.h | File | 248 B | 0644 |
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| error-injection.h | File | 1.13 KB | 0644 |
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| ftrace.h | File | 314 B | 0644 |
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| futex.h | File | 2.59 KB | 0644 |
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| getorder.h | File | 1.23 KB | 0644 |
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| hardirq.h | File | 568 B | 0644 |
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| hugetlb.h | File | 3.48 KB | 0644 |
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| hw_irq.h | File | 270 B | 0644 |
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| ide_iops.h | File | 791 B | 0644 |
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| int-ll64.h | File | 863 B | 0644 |
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| io.h | File | 26.38 KB | 0644 |
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| ioctl.h | File | 506 B | 0644 |
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| iomap.h | File | 3.92 KB | 0644 |
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| irq.h | File | 403 B | 0644 |
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| irq_regs.h | File | 773 B | 0644 |
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| irq_work.h | File | 194 B | 0644 |
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| irqflags.h | File | 1.51 KB | 0644 |
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| kdebug.h | File | 182 B | 0644 |
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| kmap_size.h | File | 263 B | 0644 |
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| kprobes.h | File | 833 B | 0644 |
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| kvm_para.h | File | 549 B | 0644 |
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| kvm_types.h | File | 113 B | 0644 |
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| linkage.h | File | 225 B | 0644 |
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| local.h | File | 2.31 KB | 0644 |
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| local64.h | File | 4.04 KB | 0644 |
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| logic_io.h | File | 2.35 KB | 0644 |
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| mcs_spinlock.h | File | 260 B | 0644 |
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| mm_hooks.h | File | 753 B | 0644 |
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| mmiowb_types.h | File | 249 B | 0644 |
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| mmu.h | File | 449 B | 0644 |
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| mmu_context.h | File | 1.62 KB | 0644 |
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| module.h | File | 1.09 KB | 0644 |
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| mshyperv.h | File | 11.13 KB | 0644 |
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| msi.h | File | 1.01 KB | 0644 |
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| param.h | File | 367 B | 0644 |
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| parport.h | File | 604 B | 0644 |
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| pci.h | File | 655 B | 0644 |
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| pci_iomap.h | File | 1.96 KB | 0644 |
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| percpu.h | File | 15.2 KB | 0644 |
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| pgalloc.h | File | 5.28 KB | 0644 |
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| pgtable-nop4d.h | File | 1.72 KB | 0644 |
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| pgtable-nopmd.h | File | 1.99 KB | 0644 |
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| pgtable-nopud.h | File | 1.95 KB | 0644 |
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| pgtable_uffd.h | File | 1.03 KB | 0644 |
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| preempt.h | File | 1.95 KB | 0644 |
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| qrwlock.h | File | 3.99 KB | 0644 |
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| qrwlock_types.h | File | 683 B | 0644 |
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| qspinlock.h | File | 4.67 KB | 0644 |
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| qspinlock_types.h | File | 2.08 KB | 0644 |
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| resource.h | File | 1.07 KB | 0644 |
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| runtime-const.h | File | 414 B | 0644 |
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| rwonce.h | File | 2.86 KB | 0644 |
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| seccomp.h | File | 1.16 KB | 0644 |
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| sections.h | File | 7.16 KB | 0644 |
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| serial.h | File | 345 B | 0644 |
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| set_memory.h | File | 362 B | 0644 |
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| shmparam.h | File | 207 B | 0644 |
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| signal.h | File | 308 B | 0644 |
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| simd.h | File | 436 B | 0644 |
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| softirq_stack.h | File | 281 B | 0644 |
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| spinlock.h | File | 2.73 KB | 0644 |
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| spinlock_types.h | File | 404 B | 0644 |
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| statfs.h | File | 169 B | 0644 |
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| string.h | File | 281 B | 0644 |
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| switch_to.h | File | 755 B | 0644 |
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| syscall.h | File | 5.02 KB | 0644 |
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| syscalls.h | File | 739 B | 0644 |
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| termios.h | File | 205 B | 0644 |
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| timex.h | File | 508 B | 0644 |
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| tlb.h | File | 20.38 KB | 0644 |
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| tlbflush.h | File | 485 B | 0644 |
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| topology.h | File | 2.17 KB | 0644 |
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| trace_clock.h | File | 391 B | 0644 |
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| uaccess.h | File | 5.51 KB | 0644 |
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| unaligned.h | File | 3.32 KB | 0644 |
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| user.h | File | 242 B | 0644 |
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| vermagic.h | File | 179 B | 0644 |
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| vga.h | File | 587 B | 0644 |
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| vmlinux.lds.h | File | 32.04 KB | 0644 |
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| vtime.h | File | 52 B | 0644 |
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| word-at-a-time.h | File | 2.75 KB | 0644 |
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| xor.h | File | 14.33 KB | 0644 |
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