linux-kernel - Re: [PATCH] tracing/filters: use list_for_each_entry

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Date:	Mon, 23 Mar 2009 09:33:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Tom Zanussi <tzanussi@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] tracing/filters: use list_for_each_entry_safe


* Li Zefan <lizf@...fujitsu.com> wrote:

> > -	list_for_each_safe(entry, tmp, &call->fields) {
> > -		field = list_entry(entry, struct ftrace_event_field, link);
> > +	list_for_each_entry_safe(field, next, &call->fields, link) {
> 
> Why we need _safe version ?

indeed the plain list_for_each_entry() variant would be fine, as the 
list is only walked, not modified:

> >  		if (!strcmp(field->name, name))
> >  			return field;
> >  	}

(I've applied this patch already as it was a step forward - so 
please enhance this in the next round of cleanups via a delta patch 
- thanks!)

	Ingo
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