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

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Date:	Tue, 10 Dec 2013 00:09:36 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Hyeoncheol Lee <cheol.lee@....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

(2013/12/09 15:19), Namhyung Kim wrote:
> @@ -398,21 +376,21 @@ static const struct fetch_type *find_fetch_type(const char *type)
>  
>  		switch (bs) {
>  		case 8:
> -			return find_fetch_type("u8");
> +			return find_fetch_type("u8", ftbl);
>  		case 16:
> -			return find_fetch_type("u16");
> +			return find_fetch_type("u16", ftbl);
>  		case 32:
> -			return find_fetch_type("u32");
> +			return find_fetch_type("u32", ftbl);
>  		case 64:
> -			return find_fetch_type("u64");
> +			return find_fetch_type("u64", ftbl);
>  		default:
>  			goto fail;
>  		}
>  	}
>  
> -	for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
> -		if (strcmp(type, fetch_type_table[i].name) == 0)
> -			return &fetch_type_table[i];
> +	for (i = 0; i < NR_FETCH_TYPES; i++)

Hmm, I consider this should use correct length of given array. Thus,
I'd like recommend you to do;
giving the size of fetch_type_table, or define *probe_fetch_type_table with
NR_FETCH_TYPES size, or introduce a gatekeeper, e.g. special terminator entry
for initializing.

> +/* Fetch type information table */
> +const struct fetch_type uprobes_fetch_type_table[] = {

For example, here if I see the NR_FETCH_TYPES in above [], I can ensure
the table has at least that size (and if there is a space, it will be
filled with zero, in that case, we just need to add a checking
fetch_type_table[i].name != NULL).

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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