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

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Date:	Wed, 11 Dec 2013 10:05:28 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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

Hi Masami,

On Tue, 10 Dec 2013 19:12:36 +0900, Masami Hiramatsu wrote:
> (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.

Or just make them static inline?

Thanks,
Namhyung
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