linux-kernel - Re: [PATCH 2/4] uprobes/tracing: Kill the pointless seq_print_ip

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Date:	Tue, 2 Apr 2013 10:57:45 +0200
From:	Anton Arapov <anton@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] uprobes/tracing: Kill the pointless
 seq_print_ip_sym() call

On Fri, Mar 29, 2013 at 07:15:43PM +0100, Oleg Nesterov wrote:
> seq_print_ip_sym(ip) in print_uprobe_event() is pointless,
> kallsyms_lookup(ip) can not resolve a user-space address.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/trace/trace_uprobe.c |    8 +-------
>  1 files changed, 1 insertions(+), 7 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index af5b773..8e00901 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -531,13 +531,7 @@ print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *e
>  	field = (struct uprobe_trace_entry_head *)iter->ent;
>  	tu = container_of(event, struct trace_uprobe, call.event);
>  
> -	if (!trace_seq_printf(s, "%s: (", tu->call.name))
> -		goto partial;
> -
> -	if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
> -		goto partial;
> -
> -	if (!trace_seq_puts(s, ")"))
> +	if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name, field->ip))
>  		goto partial;
>  
>  	data = (u8 *)&field[1];
> -- 
> 1.5.5.1

Acked-by: Anton Arapov <anton@...hat.com> 
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