arch/arm64/include/asm/atomic.h
Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/atomic.h
File Facts
- System
- Linux kernel
- Corpus path
arch/arm64/include/asm/atomic.h- Extension
.h- Size
- 7404 bytes
- Lines
- 199
- Domain
- Architecture Layer
- Bucket
- arch/arm64
- Inferred role
- Architecture Layer: implementation source
- Status
- source implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
Dependency Surface
linux/compiler.hlinux/types.hasm/barrier.hasm/cmpxchg.hasm/lse.h
Detected Declarations
function arch_atomic64_dec_if_positive
Annotated Snippet
#ifndef __ASM_ATOMIC_H
#define __ASM_ATOMIC_H
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/cmpxchg.h>
#include <asm/lse.h>
#define ATOMIC_OP(op) \
static __always_inline void arch_##op(int i, atomic_t *v) \
{ \
__lse_ll_sc_body(op, i, v); \
}
ATOMIC_OP(atomic_andnot)
ATOMIC_OP(atomic_or)
ATOMIC_OP(atomic_xor)
ATOMIC_OP(atomic_add)
ATOMIC_OP(atomic_and)
ATOMIC_OP(atomic_sub)
#undef ATOMIC_OP
#define ATOMIC_FETCH_OP(name, op) \
static __always_inline int arch_##op##name(int i, atomic_t *v) \
{ \
return __lse_ll_sc_body(op##name, i, v); \
}
#define ATOMIC_FETCH_OPS(op) \
ATOMIC_FETCH_OP(_relaxed, op) \
ATOMIC_FETCH_OP(_acquire, op) \
ATOMIC_FETCH_OP(_release, op) \
ATOMIC_FETCH_OP( , op)
ATOMIC_FETCH_OPS(atomic_fetch_andnot)
ATOMIC_FETCH_OPS(atomic_fetch_or)
ATOMIC_FETCH_OPS(atomic_fetch_xor)
ATOMIC_FETCH_OPS(atomic_fetch_add)
ATOMIC_FETCH_OPS(atomic_fetch_and)
ATOMIC_FETCH_OPS(atomic_fetch_sub)
ATOMIC_FETCH_OPS(atomic_add_return)
ATOMIC_FETCH_OPS(atomic_sub_return)
#undef ATOMIC_FETCH_OP
#undef ATOMIC_FETCH_OPS
#define ATOMIC64_OP(op) \
static __always_inline void arch_##op(long i, atomic64_t *v) \
{ \
__lse_ll_sc_body(op, i, v); \
}
ATOMIC64_OP(atomic64_andnot)
ATOMIC64_OP(atomic64_or)
ATOMIC64_OP(atomic64_xor)
ATOMIC64_OP(atomic64_add)
ATOMIC64_OP(atomic64_and)
ATOMIC64_OP(atomic64_sub)
#undef ATOMIC64_OP
#define ATOMIC64_FETCH_OP(name, op) \
static __always_inline long arch_##op##name(long i, atomic64_t *v) \
{ \
return __lse_ll_sc_body(op##name, i, v); \
}
#define ATOMIC64_FETCH_OPS(op) \
ATOMIC64_FETCH_OP(_relaxed, op) \
ATOMIC64_FETCH_OP(_acquire, op) \
ATOMIC64_FETCH_OP(_release, op) \
ATOMIC64_FETCH_OP( , op)
ATOMIC64_FETCH_OPS(atomic64_fetch_andnot)
ATOMIC64_FETCH_OPS(atomic64_fetch_or)
ATOMIC64_FETCH_OPS(atomic64_fetch_xor)
ATOMIC64_FETCH_OPS(atomic64_fetch_add)
ATOMIC64_FETCH_OPS(atomic64_fetch_and)
ATOMIC64_FETCH_OPS(atomic64_fetch_sub)
ATOMIC64_FETCH_OPS(atomic64_add_return)
ATOMIC64_FETCH_OPS(atomic64_sub_return)
#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_FETCH_OPS
static __always_inline long arch_atomic64_dec_if_positive(atomic64_t *v)
{
Annotation
- Immediate include surface: `linux/compiler.h`, `linux/types.h`, `asm/barrier.h`, `asm/cmpxchg.h`, `asm/lse.h`.
- Detected declarations: `function arch_atomic64_dec_if_positive`.
- Atlas domain: Architecture Layer / arch/arm64.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.