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riscv: Cleanup stacktrace 

1. add asm/stacktrace.h for walk_stackframe and struct stackframe
2. remove unnecessary blank lines in stacktrace.c
3. fix warning "no previous prototype for ‘fill_callchain’"

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Kefeng Wang 2020-11-13 14:42:21 +08:00 committed by Palmer Dabbelt
parent 31564b8b6d
commit 99c168fccb
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GPG Key ID: 2E1319F35FBB1889
3 changed files with 21 additions and 15 deletions
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17
arch/riscv/include/asm/stacktrace.h Normal file
View File

@ -0,0 +1,17 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_STACKTRACE_H
#define _ASM_RISCV_STACKTRACE_H
#include <linux/sched.h>
#include <asm/ptrace.h>
struct stackframe {
unsigned long fp;
unsigned long ra;
};
extern void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
bool (*fn)(unsigned long, void *), void *arg);
#endif /* _ASM_RISCV_STACKTRACE_H */

10
arch/riscv/kernel/perf_callchain.c
View File

@ -4,11 +4,7 @@
#include <linux/perf_event.h>
#include <linux/uaccess.h>
/* Kernel callchain */
struct stackframe {
unsigned long fp;
unsigned long ra;
};
#include <asm/stacktrace.h>
/*
* Get the return address for a single stackframe and return a pointer to the
@ -74,13 +70,11 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
fp = user_backtrace(entry, fp, 0);
}
bool fill_callchain(unsigned long pc, void *entry)
static bool fill_callchain(unsigned long pc, void *entry)
{
return perf_callchain_store(entry, pc);
}
void notrace walk_stackframe(struct task_struct *task,
struct pt_regs *regs, bool (*fn)(unsigned long, void *), void *arg);
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{

9
arch/riscv/kernel/stacktrace.c
View File

@ -12,15 +12,12 @@
#include <linux/stacktrace.h>
#include <linux/ftrace.h>
#include <asm/stacktrace.h>
register unsigned long sp_in_global __asm__("sp");
#ifdef CONFIG_FRAME_POINTER
struct stackframe {
unsigned long fp;
unsigned long ra;
};
void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
bool (*fn)(unsigned long, void *), void *arg)
{
@ -96,7 +93,6 @@ void notrace walk_stackframe(struct task_struct *task,
#endif /* CONFIG_FRAME_POINTER */
static bool print_trace_address(unsigned long pc, void *arg)
{
const char *loglvl = arg;
@ -130,7 +126,6 @@ unsigned long get_wchan(struct task_struct *task)
return pc;
}
#ifdef CONFIG_STACKTRACE
static bool __save_trace(unsigned long pc, void *arg, bool nosched)