mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 21:14:44 +08:00
1650743cdc
Currently, there is no way for print_stack_trace() to determine whether a given stack trace entry was deemed reliable or not, simply because save_stack_trace() does not record this information. (Perhaps needless to say, this makes the saved stack traces A LOT harder to read, and probably with no other benefits, since debugging features that use save_stack_trace() most likely also require frame pointers, etc.) This patch reverts to the old behaviour of only recording the reliable trace entries for saved stack traces. Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/module.h>
|
|
#include <asm/stacktrace.h>
|
|
|
|
static void save_stack_warning(void *data, char *msg)
|
|
{
|
|
}
|
|
|
|
static void
|
|
save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
|
|
{
|
|
}
|
|
|
|
static int save_stack_stack(void *data, char *name)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static void save_stack_address(void *data, unsigned long addr, int reliable)
|
|
{
|
|
struct stack_trace *trace = data;
|
|
if (!reliable)
|
|
return;
|
|
if (trace->skip > 0) {
|
|
trace->skip--;
|
|
return;
|
|
}
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
}
|
|
|
|
static void
|
|
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
|
|
{
|
|
struct stack_trace *trace = (struct stack_trace *)data;
|
|
if (!reliable)
|
|
return;
|
|
if (in_sched_functions(addr))
|
|
return;
|
|
if (trace->skip > 0) {
|
|
trace->skip--;
|
|
return;
|
|
}
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
}
|
|
|
|
static const struct stacktrace_ops save_stack_ops = {
|
|
.warning = save_stack_warning,
|
|
.warning_symbol = save_stack_warning_symbol,
|
|
.stack = save_stack_stack,
|
|
.address = save_stack_address,
|
|
};
|
|
|
|
static const struct stacktrace_ops save_stack_ops_nosched = {
|
|
.warning = save_stack_warning,
|
|
.warning_symbol = save_stack_warning_symbol,
|
|
.stack = save_stack_stack,
|
|
.address = save_stack_address_nosched,
|
|
};
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|