sh: stacktrace: Properly terminate the trace entry buffer.

This inserts a ULONG_MAX entry at the end of the valid entries in the
stack trace buffer so the default code doesn't need to scan to the end of
available slots. This also makes the trace buffer termination behaviour
consistent with the other architectures.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/stacktrace.c b/arch/sh/kernel/stacktrace.c
index a0f497bcbb4f604efd8d4a88c9c90294f2692d89..c2e45c48409cd64588f4ca460b4841bcad8a2909 100644 (file)
--- a/arch/sh/kernel/stacktrace.c
+++ b/arch/sh/kernel/stacktrace.c
@@ -62,6 +62,8 @@ void save_stack_trace(struct stack_trace *trace)
        unsigned long *sp = (unsigned long *)current_stack_pointer;
 
        unwind_stack(current, NULL, sp,  &save_stack_ops, trace);
+       if (trace->nr_entries < trace->max_entries)
+               trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
 EXPORT_SYMBOL_GPL(save_stack_trace);
 
@@ -97,5 +99,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
        unsigned long *sp = (unsigned long *)tsk->thread.sp;
 
        unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);
+       if (trace->nr_entries < trace->max_entries)
+               trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);