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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Message-ID: <20130302132330.GA15256@localhost>
Date:	Sat, 2 Mar 2013 21:23:30 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christopher Li <sparse@...isli.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, Mar 02, 2013 at 08:15:22AM -0500, Steven Rostedt wrote:
> 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:

That's it!  Verified with

        make C=1 kernel/trace/trace_functions.o

Thanks,
Fengguang

> 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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