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tracing: stop stack trace on first empty entry

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The stack tracer stores eight entries in the ring buffer when an event
traces the stack. The output outputs all eight entries regardless of
how many entries were recorded.

This patch breaks out of the loop when a null entry is discovered.

[ Impact: only print the stack that is recorded ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-05-14 23:40:06 -04:00 committed by Steven Rostedt
parent 29a679754b
commit 1ec7c4849c
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_output.c
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@ -898,6 +898,8 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
trace_assign_type(field, iter->ent);
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
if (!field->caller[i])
break;
if (i) {
if (!trace_seq_puts(s, " <= "))
goto partial;