arch/parisc/include/asm/jump_label.h

File Facts

System

Linux kernel

Corpus path

arch/parisc/include/asm/jump_label.h

Extension

.h

Size

1083 bytes

Lines

49

Domain

Architecture Layer

Bucket

arch/parisc

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
• linux/stringify.h
• asm/assembly.h

Detected Declarations

• function arch_static_branch
• function arch_static_branch_jump

Annotated Snippet

#ifndef _ASM_PARISC_JUMP_LABEL_H
#define _ASM_PARISC_JUMP_LABEL_H

#ifndef __ASSEMBLER__

#include <linux/types.h>
#include <linux/stringify.h>
#include <asm/assembly.h>

#define JUMP_LABEL_NOP_SIZE 4

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm goto("1:\n\t"
		 "nop\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 ".align %1\n\t"
		 ".word 1b - ., %l[l_yes] - .\n\t"
		 __stringify(ASM_ULONG_INSN) " %c0 - .\n\t"
		 ".popsection\n\t"
		 : : "i" (&((char *)key)[branch]), "i" (sizeof(long))
		 : : l_yes);

	return false;
l_yes:
	return true;
}

static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
	asm goto("1:\n\t"
		 "b,n %l[l_yes]\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 ".align %1\n\t"
		 ".word 1b - ., %l[l_yes] - .\n\t"
		 __stringify(ASM_ULONG_INSN) " %c0 - .\n\t"
		 ".popsection\n\t"
		 : : "i" (&((char *)key)[branch]), "i" (sizeof(long))
		 : : l_yes);

	return false;
l_yes:
	return true;
}

#endif  /* __ASSEMBLER__ */
#endif

Annotation

• Immediate include surface: `linux/types.h`, `linux/stringify.h`, `asm/assembly.h`.
• Detected declarations: `function arch_static_branch`, `function arch_static_branch_jump`.
• Atlas domain: Architecture Layer / arch/parisc.
• 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.