linux-kernel - Re: [PATCH 1/2] exec: allow core_pipe recursion check to look for a value of 1 rather than 0 (v2)

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Message-ID: <20100131154135.GA1950@localhost.localdomain>
Date:	Sun, 31 Jan 2010 10:41:35 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	jmoskovc@...hat.com, mingo@...hat.com, drbd-dev@...ts.linbit.com,
	benh@...nel.crashing.org, t.sailer@...mni.ethz.ch, abelay@....edu,
	gregkh@...e.de, spock@...too.org, viro@...iv.linux.org.uk,
	neilb@...e.de, mfasheh@...e.com, menage@...gle.com,
	shemminger@...ux-foundation.org, takedakn@...data.co.jp
Subject: Re: [PATCH 1/2] exec: allow core_pipe recursion check to look for a
 value of 1 rather than 0 (v2)

On Sun, Jan 31, 2010 at 03:46:06PM +0100, Oleg Nesterov wrote:
> On 01/29, Neil Horman wrote:
> >
> > Add init function to usermodehelper
> >
> > Convert call_usermodehelper_cleanup to usermodehelper_fns and allow it to assign
> > both an init function and a cleanup function.
> 
> Can't apply this patch, I guess -mm tree has other changes which
> this patch depends on. However afaics this series is fine, just
> a couple of nits.
> 
Yeah, this will only apply to latest -mm

> > @@ -154,7 +155,9 @@ struct subprocess_info {
> >  	enum umh_wait wait;
> >  	int retval;
> >  	struct file *stdin;
> > -	void (*cleanup)(char **argv, char **envp);
> > +	int (*init)(void *data);
> > +	void (*cleanup)(char **argv, char **envp, void *data);
> > +	void *data;
> 
> OK, we add *data. But why this patch changes the prototype of ->cleanup() ?
> OTOH, I completely agree, it should be changed, and it should lose the
> ugly argv/envp arguments.
> 
> Since we add subprocess_info->data ptr, I think both ->init and ->cleanup
> funcs should have the single arg, "subprocess_info *info". argv, envp, data
> they all can be accessed via *info.
> 
Yeah, I can do that.

> Also. It is not clear why this patch changes call_usermodehelper_setup()
> to set info->data. Unless the caller uses call_usermodehelper_setinit()
> or call_usermodehelper_setcleanup() info->data is not used. Perhaps
> it is better to have a single helper which takes (init, cleanup, data)
> args.
> 
> What do you think?
> 
Yeah, that seems reasonable, Honestly, I'm a bit confused as to why there are
set* helpers in the first place, we could just eliminate them entirely, since
callers can set all three independently with call_usermodehelper_fns.  Anywho,
I'll clean that up some more.
 
> In any case, I believe you should fix the subjects ;)
> 
Not sure whats wrong with the subjects, although I guess I am doing a good bit
more than just fixing that at this point :).  I'll expand them.

Give me a few days, and I'll repost.
Neil

> Oleg.
> 
> 
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