netdev - Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

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Message-ID: <20140905233203.GG15723@mtj.dyndns.org>
Date:	Sat, 6 Sep 2014 08:32:03 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wu Zhangjin <falcon@...zu.com>, Takashi Iwai <tiwai@...e.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>, hare@...e.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Benjamin Poirier <bpoirier@...e.de>,
	Santosh Rastapur <santosh@...lsio.com>,
	Kay Sievers <kay@...y.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

Hey,

On Fri, Sep 05, 2014 at 04:22:42PM -0700, Dmitry Torokhov wrote:
> > I don't get it.  This is a behavior userland already depends on for
> > boots.  What's there to agree or disagree?  This is just a fact that
> > we can't do this w/o disturbing some userlands in a major way.
> 
> I am just expressing my disbelief that somebody relies on module loading
> being synchronous with probing. Out of curiosity, do you have any
> pointers?

I've seen initrd scripts which depended on the behavior to wait for
storage devices over the years.  AFAIK, none of the modern distros
does it but this has been such a basic feature all along and it seems
highly unlikely to me that there's no userland remaining out there
depending on such behavior.  We do have a lot of different userlands,
many of them quite ad-hoc.

Thanks.

-- 
tejun
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