linux-kernel - Re: [PATCH v2 2/2] trace_uprobe: Simplify probes_seq

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Date:   Thu, 15 Mar 2018 18:31:23 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        keescook@...omium.org, wangnan0@...wei.com, mingo@...hat.com,
        srikar@...ux.vnet.ibm.com, oleg@...hat.com, mhiramat@...nel.org,
        namhyung@...nel.org
Subject: Re: [PATCH v2 2/2] trace_uprobe: Simplify probes_seq_show()

On Thu, 15 Mar 2018 13:57:56 +0530
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> Simplify probes_seq_show() function. No change in output
> before and after patch.

Yeah, we don't need this trick anymore.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you!

> 
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> ---
>  kernel/trace/trace_uprobe.c | 21 +++------------------
>  1 file changed, 3 insertions(+), 18 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 0298bd15be83..544fa10a471b 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -602,24 +602,9 @@ static int probes_seq_show(struct seq_file *m, void *v)
>  	char c = is_ret_probe(tu) ? 'r' : 'p';
>  	int i;
>  
> -	seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system,
> -			trace_event_name(&tu->tp.call));
> -	seq_printf(m, " %s:", tu->filename);
> -
> -	/* Don't print "0x  (null)" when offset is 0 */
> -	if (tu->offset) {
> -		seq_printf(m, "0x%0*lx", (int)(sizeof(void *) * 2), tu->offset);
> -	} else {
> -		switch (sizeof(void *)) {
> -		case 4:
> -			seq_printf(m, "0x00000000");
> -			break;
> -		case 8:
> -		default:
> -			seq_printf(m, "0x0000000000000000");
> -			break;
> -		}
> -	}
> +	seq_printf(m, "%c:%s/%s %s:0x%0*lx", c, tu->tp.call.class->system,
> +			trace_event_name(&tu->tp.call), tu->filename,
> +			(int)(sizeof(void *) * 2), tu->offset);
>  
>  	for (i = 0; i < tu->tp.nr_args; i++)
>  		seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
> -- 
> 2.13.6
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>