arch/xtensa/kernel/irq.c

File Facts

System

Linux kernel

Corpus path

arch/xtensa/kernel/irq.c

Extension

.c

Size

4749 bytes

Lines

196

Domain

Architecture Layer

Bucket

arch/xtensa

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

Dependency Surface

• linux/module.h
• linux/seq_file.h
• linux/interrupt.h
• linux/irq.h
• linux/kernel_stat.h
• linux/irqchip.h
• linux/irqchip/xtensa-mx.h
• linux/irqchip/xtensa-pic.h
• linux/irqdomain.h
• linux/of.h
• asm/mxregs.h
• linux/uaccess.h
• asm/platform.h
• asm/traps.h

Detected Declarations

• function do_IRQ
• function arch_show_interrupts
• function xtensa_irq_domain_xlate
• function xtensa_irq_map
• function xtensa_map_ext_irq
• function xtensa_get_ext_irq_no
• function init_IRQ
• function migrate_irqs
• function for_each_active_irq

Annotated Snippet

if (newcpu >= nr_cpu_ids) {
			pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
					    i, cpu);

			irq_set_affinity(i, cpu_all_mask);
		} else {
			irq_set_affinity(i, mask);
		}
	}
}
#endif /* CONFIG_HOTPLUG_CPU */

Annotation

• Immediate include surface: `linux/module.h`, `linux/seq_file.h`, `linux/interrupt.h`, `linux/irq.h`, `linux/kernel_stat.h`, `linux/irqchip.h`, `linux/irqchip/xtensa-mx.h`, `linux/irqchip/xtensa-pic.h`.
• Detected declarations: `function do_IRQ`, `function arch_show_interrupts`, `function xtensa_irq_domain_xlate`, `function xtensa_irq_map`, `function xtensa_map_ext_irq`, `function xtensa_get_ext_irq_no`, `function init_IRQ`, `function migrate_irqs`, `function for_each_active_irq`.
• Atlas domain: Architecture Layer / arch/xtensa.
• Implementation status: source implementation candidate.

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.