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parisc: Switch to ARCH_STACKWALK implementation

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

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2021-05-04 14:49:14 +02:00
parent a348eab327
commit aeb1e833a4
2 changed files with 15 additions and 17 deletions
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2
arch/parisc/Kconfig
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@ -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

30
arch/parisc/kernel/stacktrace.c
View File

@ -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);