arch/sh/kernel/irq.c

File Facts

System

Linux kernel

Corpus path

arch/sh/kernel/irq.c

Extension

.c

Size

5928 bytes

Lines

250

Domain

Architecture Layer

Bucket

arch/sh

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/irq.h
• linux/interrupt.h
• linux/module.h
• linux/kernel_stat.h
• linux/seq_file.h
• linux/ftrace.h
• linux/delay.h
• linux/ratelimit.h
• asm/processor.h
• asm/machvec.h
• linux/uaccess.h
• asm/thread_info.h
• cpu/mmu_context.h
• asm/softirq_stack.h

Detected Declarations

• function ack_bad_irq
• function arch_show_interrupts
• function handle_one_irq
• function stack
• function irq_ctx_init
• function irq_ctx_exit
• function do_softirq_own_stack
• function handle_one_irq
• function do_IRQ
• function init_IRQ
• function migrate_irqs
• function for_each_active_irq

Annotated Snippet

if (irq_data_get_node(data) == cpu) {
			const struct cpumask *mask = irq_data_get_affinity_mask(data);
			unsigned int newcpu = cpumask_any_and(mask,
							      cpu_online_mask);
			if (newcpu >= nr_cpu_ids) {
				pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
						    irq, cpu);

				irq_set_affinity(irq, cpu_all_mask);
			} else {
				irq_set_affinity(irq, mask);
			}
		}
	}
}
#endif

Annotation

• Immediate include surface: `linux/irq.h`, `linux/interrupt.h`, `linux/module.h`, `linux/kernel_stat.h`, `linux/seq_file.h`, `linux/ftrace.h`, `linux/delay.h`, `linux/ratelimit.h`.
• Detected declarations: `function ack_bad_irq`, `function arch_show_interrupts`, `function handle_one_irq`, `function stack`, `function irq_ctx_init`, `function irq_ctx_exit`, `function do_softirq_own_stack`, `function handle_one_irq`, `function do_IRQ`, `function init_IRQ`.
• Atlas domain: Architecture Layer / arch/sh.
• 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.