arch/arm/kernel/smp.c

File Facts

System

Linux kernel

Corpus path

arch/arm/kernel/smp.c

Extension

.c

Size

19287 bytes

Lines

853

Domain

Architecture Layer

Bucket

arch/arm

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/delay.h
• linux/init.h
• linux/spinlock.h
• linux/sched/mm.h
• linux/sched/hotplug.h
• linux/sched/task_stack.h
• linux/interrupt.h
• linux/cache.h
• linux/profile.h
• linux/errno.h
• linux/mm.h
• linux/err.h
• linux/cpu.h
• linux/seq_file.h
• linux/irq.h
• linux/nmi.h
• linux/percpu.h
• linux/clockchips.h
• linux/completion.h
• linux/cpufreq.h
• linux/irq_work.h
• linux/kernel_stat.h
• linux/atomic.h
• asm/bugs.h
• asm/smp.h
• asm/cacheflush.h
• asm/cpu.h
• asm/cputype.h
• asm/exception.h
• asm/idmap.h
• asm/topology.h

Detected Declarations

• enum ipi_msg_type
• function smp_set_ops
• function get_arch_pgd
• function secondary_biglittle_prepare
• function secondary_biglittle_init
• function secondary_biglittle_prepare
• function secondary_biglittle_init
• function smp_init_cpus
• function platform_can_secondary_boot
• function platform_can_cpu_hotplug
• function platform_cpu_kill
• function platform_cpu_disable
• function platform_can_hotplug_cpu
• function ipi_teardown
• function __cpu_disable
• function arch_cpuhp_cleanup_dead_cpu
• function arch_cpu_idle_dead
• function smp_store_cpu_info
• function set_current
• function secondary_start_kernel
• function smp_cpus_done
• function smp_prepare_boot_cpu
• function smp_prepare_cpus
• function show_ipi_list
• function arch_send_call_function_ipi_mask
• function arch_send_wakeup_ipi_mask
• function arch_send_call_function_single_ipi
• function arch_irq_work_raise
• function tick_broadcast
• function ipi_cpu_stop
• function register_ipi_completion
• function ipi_complete
• function do_handle_IPI
• function handle_IPI
• function ipi_handler
• function smp_cross_call
• function ipi_setup
• function set_smp_ipi_range
• function arch_smp_send_reschedule
• function smp_send_stop
• function panic_smp_self_stop
• function cpufreq_callback
• function register_cpufreq_notifier
• function raise_nmi
• function arch_trigger_cpumask_backtrace
• module init register_cpufreq_notifier

Annotated Snippet

core_initcall(register_cpufreq_notifier);

#endif

static void raise_nmi(cpumask_t *mask)
{
	__ipi_send_mask(ipi_desc[IPI_CPU_BACKTRACE], mask);
}

void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu)
{
	nmi_trigger_cpumask_backtrace(mask, exclude_cpu, raise_nmi);
}

Annotation

• Immediate include surface: `linux/module.h`, `linux/delay.h`, `linux/init.h`, `linux/spinlock.h`, `linux/sched/mm.h`, `linux/sched/hotplug.h`, `linux/sched/task_stack.h`, `linux/interrupt.h`.
• Detected declarations: `enum ipi_msg_type`, `function smp_set_ops`, `function get_arch_pgd`, `function secondary_biglittle_prepare`, `function secondary_biglittle_init`, `function secondary_biglittle_prepare`, `function secondary_biglittle_init`, `function smp_init_cpus`, `function platform_can_secondary_boot`, `function platform_can_cpu_hotplug`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.