linux-kernel - Re: [PATCH 08/17] tracing/probes: Split [ku]probes_fetch_type

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Message-ID: <20131202170454.GA28115@redhat.com>
Date:	Mon, 2 Dec 2013 18:04:54 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hyeoncheol Lee <cheol.lee@....com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 08/17] tracing/probes: Split [ku]probes_fetch_type_table

On 11/27, Namhyung Kim wrote:
>
> Use separate fetch_type_table for kprobes and uprobes.  It currently
> shares all fetch methods but some of them will be implemented
> differently later.

Hmm. This looks wrong, afaics...

>  static int parse_probe_arg(char *arg, const struct fetch_type *t,
>  		     struct fetch_param *f, bool is_return, bool is_kprobe)
>  {
> +	const struct fetch_type *ftbl;
>  	unsigned long param;
>  	long offset;
>  	char *tmp;
> -	int ret;
> +	int ret = 0;
>
> -	ret = 0;
> +	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;

OK, but what if, say, CONFIG_KPROBE_EVENT && !CONFIG_UPROBE_EVENT ?
The kernel won't compile in this case?

Oleg.

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