linux-kernel - Re: [trace:tip/perf/core 5/15] kernel/trace/trace_functions.c:79:16: sparse: incorrect type in initializer (different address spaces)

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Date:	Sat, 02 Mar 2013 08:15:22 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [trace:tip/perf/core 5/15]
 kernel/trace/trace_functions.c:79:16: sparse: incorrect type in initializer
 (different address spaces)

On Sat, 2013-03-02 at 08:12 -0500, Steven Rostedt wrote:

> Hmm, actually it seems to be complaining everywhere but in trace.c which
> is where the per_cpu was allocated. Do I need to annotate the trace.h
> header to specify (at least to sparse) that the pointer is allocated per
> cpu?

I guess I need this patch:

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c597523..50a9c81 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -198,7 +198,7 @@ struct trace_array {
        struct list_head        systems;
        struct list_head        events;
        struct task_struct      *waiter;
-       struct trace_array_cpu  *data;
+       struct trace_array_cpu __percpu *data;
 };
 
 enum {

-- Steve


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