arch/csky/include/asm/jump_label.h

File Facts

System

Linux kernel

Corpus path

arch/csky/include/asm/jump_label.h

Extension

.h

Size

1193 bytes

Lines

53

Domain

Architecture Layer

Bucket

arch/csky

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/types.h

Detected Declarations

• enum jump_label_type
• function arch_static_branch
• function arch_static_branch_jump

Annotated Snippet

#ifndef __ASM_CSKY_JUMP_LABEL_H
#define __ASM_CSKY_JUMP_LABEL_H

#ifndef __ASSEMBLER__

#include <linux/types.h>

#define JUMP_LABEL_NOP_SIZE 4

static __always_inline bool arch_static_branch(struct static_key *key,
					       bool branch)
{
	asm goto(
		"1:	nop32					\n"
		"	.pushsection	__jump_table, \"aw\"	\n"
		"	.align		2			\n"
		"	.long		1b - ., %l[label] - .	\n"
		"	.long		%0 - .			\n"
		"	.popsection				\n"
		:  :  "i"(&((char *)key)[branch]) :  : label);

	return false;
label:
	return true;
}

static __always_inline bool arch_static_branch_jump(struct static_key *key,
						    bool branch)
{
	asm goto(
		"1:	bsr32		%l[label]		\n"
		"	.pushsection	__jump_table, \"aw\"	\n"
		"	.align		2			\n"
		"	.long		1b - ., %l[label] - .	\n"
		"	.long		%0 - .			\n"
		"	.popsection				\n"
		:  :  "i"(&((char *)key)[branch]) :  : label);

	return false;
label:
	return true;
}

enum jump_label_type;
void arch_jump_label_transform_static(struct jump_entry *entry,
				      enum jump_label_type type);
#define arch_jump_label_transform_static arch_jump_label_transform_static

#endif  /* __ASSEMBLER__ */
#endif	/* __ASM_CSKY_JUMP_LABEL_H */

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `enum jump_label_type`, `function arch_static_branch`, `function arch_static_branch_jump`.
• Atlas domain: Architecture Layer / arch/csky.
• 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.