arch/sh/kernel/perf_callchain.c

Source file repositories/reference/linux-study-clean/arch/sh/kernel/perf_callchain.c

File Facts

System
Linux kernel
Corpus path
arch/sh/kernel/perf_callchain.c
Extension
.c
Size
764 bytes
Lines
33
Domain
Architecture Layer
Bucket
arch/sh
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
/*
 * Performance event callchain support - SuperH architecture code
 *
 * Copyright (C) 2009  Paul Mundt
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/perf_event.h>
#include <linux/percpu.h>
#include <asm/unwinder.h>
#include <asm/ptrace.h>

static void callchain_address(void *data, unsigned long addr, int reliable)
{
	struct perf_callchain_entry_ctx *entry = data;

	if (reliable)
		perf_callchain_store(entry, addr);
}

static const struct stacktrace_ops callchain_ops = {
	.address	= callchain_address,
};

void
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
	perf_callchain_store(entry, regs->pc);

	unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
}

Annotation

Implementation Notes