linux-kernel - Re: [PATCH 1/2] ftrace: fix trace

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Message-Id: <20090115174008.935e0391.akpm@linux-foundation.org>
Date:	Thu, 15 Jan 2009 17:40:08 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Mason <chris.mason@...cle.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/2] ftrace: fix trace_output

On Thu, 15 Jan 2009 19:40:51 -0500 Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Lai Jiangshan <laijs@...fujitsu.com>
> 
> Impact: fix bug for handling partial line
> 
> trace_seq_printf(), seq_print_userip_objs(), ... return
> 0          -- partial line was written
> other(>0)  -- success
> 
> duplicate output is also removed in trace_print_raw().
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> ---
>  kernel/trace/trace_output.c |   65 ++++++++++++++++++++----------------------
>  kernel/trace/trace_output.h |    4 +-
>  2 files changed, 33 insertions(+), 36 deletions(-)
> 
> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index df0c25c..4e3ad36 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -440,9 +440,9 @@ trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
>  
>  	trace_assign_type(field, entry);
>  
> -	if (trace_seq_printf(s, "%x %x\n",
> -			     field->ip,
> -			     field->parent_ip))
> +	if (!trace_seq_printf(s, "%x %x\n",

"%lx %lx", surely?

If trace_seq_printf() had the attribute(printf) thing, it would have warned.


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