1 files changed, 39 insertions, 0 deletions

diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index 40decfbb9a24..f0cfd12cb45e 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -23,6 +23,44 @@ unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
 unsigned int stack_trace_save_user(unsigned long *store, unsigned int size);
 
 /* Internal interfaces. Do not use in generic code */
+#ifdef CONFIG_ARCH_STACKWALK
+
+/**
+ * stack_trace_consume_fn - Callback for arch_stack_walk()
+ * @cookie:     Caller supplied pointer handed back by arch_stack_walk()
+ * @addr:       The stack entry address to consume
+ * @reliable:   True when the stack entry is reliable. Required by
+ *              some printk based consumers.
+ *
+ * Return:      True, if the entry was consumed or skipped
+ *              False, if there is no space left to store
+ */
+typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr,
+                                       bool reliable);
+/**
+ * arch_stack_walk - Architecture specific function to walk the stack
+ * @consume_entry:      Callback which is invoked by the architecture code for
+ *                      each entry.
+ * @cookie:             Caller supplied pointer which is handed back to
+ *                      @consume_entry
+ * @task:               Pointer to a task struct, can be NULL
+ * @regs:               Pointer to registers, can be NULL
+ *
+ * ============ ======= ============================================
+ * task         regs
+ * ============ ======= ============================================
+ * task         NULL    Stack trace from task (can be current)
+ * current      regs    Stack trace starting on regs->stackpointer
+ * ============ ======= ============================================
+ */
+void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
+                     struct task_struct *task, struct pt_regs *regs);
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
+                             struct task_struct *task);
+void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
+                          const struct pt_regs *regs);
+
+#else /* CONFIG_ARCH_STACKWALK */
 struct stack_trace {
         unsigned int nr_entries, max_entries;
         unsigned long *entries;
@@ -37,6 +75,7 @@ extern void save_stack_trace_tsk(struct task_struct *tsk,
 extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
                                          struct stack_trace *trace);
 extern void save_stack_trace_user(struct stack_trace *trace);
+#endif /* !CONFIG_ARCH_STACKWALK */
 #endif /* CONFIG_STACKTRACE */
 
 #if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE)