linux-kernel - Re: [PATCH 10/17] tracing/probes: Move 'symbol' fetch method to kprobes

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Message-ID: <52A6E914.9050200@hitachi.com>
Date:	Tue, 10 Dec 2013 19:12:36 +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 10/17] tracing/probes: Move 'symbol' fetch method to
 kprobes

(2013/12/09 15:19), Namhyung Kim wrote:

> diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
> index 23b2d83ee5fb..d327a1c21f4b 100644
> --- a/kernel/trace/trace_probe.h
> +++ b/kernel/trace/trace_probe.h
> @@ -239,6 +239,30 @@ ASSIGN_FETCH_FUNC(bitfield, ftype),			\
>  extern __weak const struct fetch_type kprobes_fetch_type_table[];
>  extern __weak const struct fetch_type uprobes_fetch_type_table[];
>  
> +#ifdef CONFIG_KPROBE_EVENT
> +struct symbol_cache;
> +unsigned long update_symbol_cache(struct symbol_cache *sc);
> +void free_symbol_cache(struct symbol_cache *sc);
> +struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
> +#else
> +struct symbol_cache {
> +};
> +static unsigned long __used update_symbol_cache(struct symbol_cache *sc)
> +{
> +	return 0;
> +}
> +
> +static void __used free_symbol_cache(struct symbol_cache *sc)
> +{
> +}
> +
> +static struct symbol_cache * __used
> +alloc_symbol_cache(const char *sym, long offset)
> +{
> +	return NULL;
> +}
> +#endif /* CONFIG_KPROBE_EVENT */

Hmm, defining non-inline function in the header looks odd.
Maybe you'd better do this (or define __weak instances)
in trace_probe.c.

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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