linux-kernel - Re: [PATCH 1/4] uprobes/tracing: Kill the pointless task_pt

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Message-ID: <20130402085709.GB24889@bandura.brq.redhat.com>
Date:	Tue, 2 Apr 2013 10:57:09 +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 1/4] uprobes/tracing: Kill the pointless task_pt_regs()
 calls

On Fri, Mar 29, 2013 at 07:15:40PM +0100, Oleg Nesterov wrote:
> uprobe_trace_func() and uprobe_perf_func() do not need task_pt_regs(),
> we already have "struct pt_regs *regs".
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/trace/trace_uprobe.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 8dad2a9..af5b773 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -507,7 +507,7 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
>  		return 0;
>  
>  	entry = ring_buffer_event_data(event);
> -	entry->ip = instruction_pointer(task_pt_regs(current));
> +	entry->ip = instruction_pointer(regs);
>  	data = (u8 *)&entry[1];
>  	for (i = 0; i < tu->nr_args; i++)
>  		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
> @@ -777,7 +777,7 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
>  	if (!entry)
>  		goto out;
>  
> -	entry->ip = instruction_pointer(task_pt_regs(current));
> +	entry->ip = instruction_pointer(regs);
>  	data = (u8 *)&entry[1];
>  	for (i = 0; i < tu->nr_args; i++)
>  		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
> -- 
> 1.5.5.1
>
Acked-by: Anton Arapov <anton@...hat.com>
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