linux-kernel - Re: [PATCH] Re: alpha: undefined reference to `save_stack

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Message-ID: <20081031195040.GV28946@ZenIV.linux.org.uk>
Date:	Fri, 31 Oct 2008 19:50:41 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	rostedt@...dmis.org
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Re: alpha: undefined reference to `save_stack_trace'

On Fri, Oct 31, 2008 at 07:06:08PM +0000, Al Viro wrote:
> On Fri, Oct 31, 2008 at 06:55:26PM +0000, Al Viro wrote:
> 
> > It's too ugly for words, but it does deal with this mess ;-/
> 
> ... doesn't.  Unfortunately.

... since we also need to ifdef out the guts of ftrace_trace_stack().
We also want to disallow setting TRACE_ITER_STACKTRACE in trace_flags
on such configs, but that can wait.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b58f43b..33dbefd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -25,7 +25,7 @@ config TRACING
 	bool
 	select DEBUG_FS
 	select RING_BUFFER
-	select STACKTRACE
+	select STACKTRACE if STACKTRACE_SUPPORT
 	select TRACEPOINTS
 	select NOP_TRACER
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8a499e2..85bee77 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -705,6 +705,7 @@ static void ftrace_trace_stack(struct trace_array *tr,
 			       unsigned long flags,
 			       int skip, int pc)
 {
+#ifdef CONFIG_STACKTRACE
 	struct ring_buffer_event *event;
 	struct stack_entry *entry;
 	struct stack_trace trace;
@@ -730,6 +731,7 @@ static void ftrace_trace_stack(struct trace_array *tr,
 
 	save_stack_trace(&trace);
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+#endif
 }
 
 void __trace_stack(struct trace_array *tr,
--
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