linux-kernel - Re: [PATCH 22/28] tools lib traceevent: Remove malloc_or

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Date:	Wed, 4 Dec 2013 10:29:34 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 22/28] tools lib traceevent: Remove malloc_or_die from
 event-plugin.c

On Tue, Dec 03, 2013 at 11:16:01AM -0500, Steven Rostedt wrote:
> On Tue,  3 Dec 2013 14:09:36 +0100
> Jiri Olsa <jolsa@...hat.com> wrote:
> 
> > Removing malloc_or_die calls from event-plugin.c,
> > replacing them with standard malloc and error path.
> > 
> > Suggested-by: Namhyung Kim <namhyung@...nel.org>
> > Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> > Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Ingo Molnar <mingo@...e.hu>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Cc: Paul Mackerras <paulus@...ba.org>
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: David Ahern <dsahern@...il.com>
> > ---
> >  tools/lib/traceevent/event-plugin.c | 19 ++++++++++++++++---
> >  1 file changed, 16 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/lib/traceevent/event-plugin.c b/tools/lib/traceevent/event-plugin.c
> > index d272d87..125f567 100644
> > --- a/tools/lib/traceevent/event-plugin.c
> > +++ b/tools/lib/traceevent/event-plugin.c
> > @@ -47,7 +47,11 @@ load_plugin(struct pevent *pevent, const char *path,
> >  	char *plugin;
> >  	void *handle;
> >  
> > -	plugin = malloc_or_die(strlen(path) + strlen(file) + 2);
> > +	plugin = malloc(strlen(path) + strlen(file) + 2);
> > +	if (!plugin) {
> > +		warning("could not allocate plugin memory\n");
> > +		return;
> 
> This should be changed to return an error code. Yes it will require
> other places to change for that update as well.

Any chance this could be a separated feature? ;-)

AFACIS there's no technical problem with the current code.
If the load_plugin fails (due to ENOMEM or interface error)
it's not added on the plugin_list, which is the output/handle
of plugin interface (and there's warning ;-)).

I think we need some complex/unified error handling for the
whole library and add that globally.

jirka
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