Commit aeb1e833 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Switch to ARCH_STACKWALK implementation 



It's shorter and kfence currently depends on this stack unwinding
implementation.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent a348eab3

arch/parisc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ config PARISC 
	select ARCH_NO_SG_CHAIN

	select ARCH_SUPPORTS_HUGETLBFS if PA20

	select ARCH_SUPPORTS_MEMORY_FAILURE

	select ARCH_STACKWALK

	select HAVE_RELIABLE_STACKTRACE

	select DMA_OPS

	select RTC_CLASS

	select RTC_DRV_GENERIC

arch/parisc/kernel/stacktrace.c

+13 −17
Original line number Diff line number Diff line
@@ -2,45 +2,41 @@ 
/*

 * Stack trace management functions

 *

 *  Copyright (C) 2009 Helge Deller <deller@gmx.de>

 *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>

 *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>

 *  and parisc unwind functions by Randolph Chung <tausq@debian.org>

 *

 *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)

 */

#include <linux/module.h>

#include <linux/stacktrace.h>



#include <asm/unwind.h>



static void dump_trace(struct task_struct *task, struct stack_trace *trace)

static void notrace walk_stackframe(struct task_struct *task,

	struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)

{

	struct unwind_frame_info info;



	unwind_frame_init_task(&info, task, NULL);



	/* unwind stack and save entries in stack_trace struct */

	trace->nr_entries = 0;

	while (trace->nr_entries < trace->max_entries) {

	while (1) {

		if (unwind_once(&info) < 0 || info.ip == 0)

			break;



		if (__kernel_text_address(info.ip))

			trace->entries[trace->nr_entries++] = info.ip;

			if (!fn(cookie, info.ip))

				break;

	}

}



/*

 * Save stack-backtrace addresses into a stack_trace buffer.

 */

void save_stack_trace(struct stack_trace *trace)

void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,

		     struct task_struct *task, struct pt_regs *regs)

{

	dump_trace(current, trace);

	walk_stackframe(task, regs, consume_entry, cookie);

}

EXPORT_SYMBOL_GPL(save_stack_trace);



void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)

int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,

			     struct task_struct *task)

{

	dump_trace(tsk, trace);

	walk_stackframe(task, NULL, consume_entry, cookie);

	return 1;

}
 
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);