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Commit 9212ddb5 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
parent 4a6908a3

kernel/stacktrace.c

+11 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 *  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>
@@ -24,3 +25,13 @@ void print_stack_trace(struct stack_trace *trace, int spaces) 
}

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");

}