linux-stable/kernel/stacktrace.c
Ingo Molnar 9212ddb5ea stacktrace: provide save_stack_trace_tsk() weak alias
Impact: build fix

Some architectures have not implemented save_stack_trace_tsk() yet:

  fs/built-in.o: In function `proc_pid_stack':
  base.c:(.text+0x3f140): undefined reference to `save_stack_trace_tsk'

So warn about that if the facility is used.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-25 11:44:43 +01:00

37 lines
896 B
C

/*
* kernel/stacktrace.c
*
* Stack trace management functions
*
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
void print_stack_trace(struct stack_trace *trace, int spaces)
{
int i;
if (WARN_ON(!trace->entries))
return;
for (i = 0; i < trace->nr_entries; i++) {
printk("%*c", 1 + spaces, ' ');
print_ip_sym(trace->entries[i]);
}
}
EXPORT_SYMBOL_GPL(print_stack_trace);
/*
* Architectures that do not implement save_stack_trace_tsk get this
* weak alias and a once-per-bootup warning (whenever this facility
* is utilized - for example by procfs):
*/
__weak void
save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
}