linux-kernel - Re: [PATCH 14/14] mm: oom_kill: use IS

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Date:	Mon, 6 Sep 2010 01:59:34 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Kulikov Vasiliy <segooon@...il.com>,
	kernel-janitors@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 14/14] mm: oom_kill: use IS_ERR() instead of strict
 checking

On Mon, 6 Sep 2010, KOSAKI Motohiro wrote:

> > From: Vasiliy Kulikov <segooon@...il.com>
> > 
> > Use IS_ERR() instead of strict checking.
> 
> Umm...
> 
> I don't like this. IS_ERR() imply an argument is error code. but in
> this case, we don't use error code. -1 mean oom special purpose meaning
> value.
> 

You could make the same argument by saying the current use of PTR_ERR() 
implies an error code.  We've simply hijacked -1UL for simplicity in this 
case and because select_bad_process() can only return one other value 
besides a pointer to a process or NULL.

> So, if we take this direction, It would be better to use EAGAIN or something
> instead -1.
> 

I agree it would probably better to return ERR_PTR(-EAGAIN) instead of 
using -1UL.
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