arch/arm/kernel/jump_label.c

Source file repositories/reference/linux-study-clean/arch/arm/kernel/jump_label.c

File Facts

System
Linux kernel
Corpus path
arch/arm/kernel/jump_label.c
Extension
.c
Size
669 bytes
Lines
30
Domain
Architecture Layer
Bucket
arch/arm
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/jump_label.h>
#include <asm/text-patching.h>
#include <asm/insn.h>

static void __arch_jump_label_transform(struct jump_entry *entry,
					enum jump_label_type type,
					bool is_static)
{
	void *addr = (void *)entry->code;
	unsigned int insn;

	if (type == JUMP_LABEL_JMP)
		insn = arm_gen_branch(entry->code, entry->target);
	else
		insn = arm_gen_nop();

	if (is_static)
		__patch_text_early(addr, insn);
	else
		patch_text(addr, insn);
}

void arch_jump_label_transform(struct jump_entry *entry,
			       enum jump_label_type type)
{
	__arch_jump_label_transform(entry, type, false);
}

Annotation

Implementation Notes