kernel/bpf/dispatcher.c

File Facts

System

Linux kernel

Corpus path

kernel/bpf/dispatcher.c

Extension

.c

Size

4318 bytes

Lines

172

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• 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/hash.h
• linux/bpf.h
• linux/filter.h
• linux/static_call.h

Detected Declarations

• function bpf_dispatcher_add_prog
• function bpf_dispatcher_remove_prog
• function arch_prepare_bpf_dispatcher
• function bpf_dispatcher_prepare
• function bpf_dispatcher_update
• function bpf_dispatcher_change_prog

Annotated Snippet

if (!d->rw_image) {
			bpf_prog_pack_free(d->image, PAGE_SIZE);
			d->image = NULL;
			goto out;
		}
		bpf_image_ksym_init(d->image, PAGE_SIZE, &d->ksym);
		bpf_image_ksym_add(&d->ksym);
	}

	prev_num_progs = d->num_progs;
	changed |= bpf_dispatcher_remove_prog(d, from);
	changed |= bpf_dispatcher_add_prog(d, to);

	if (!changed)
		goto out;

	bpf_dispatcher_update(d, prev_num_progs);
out:
	mutex_unlock(&d->mutex);
}

Annotation

• Immediate include surface: `linux/hash.h`, `linux/bpf.h`, `linux/filter.h`, `linux/static_call.h`.
• Detected declarations: `function bpf_dispatcher_add_prog`, `function bpf_dispatcher_remove_prog`, `function arch_prepare_bpf_dispatcher`, `function bpf_dispatcher_prepare`, `function bpf_dispatcher_update`, `function bpf_dispatcher_change_prog`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• 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.