linux-kernel - Re: [PATCH 6/6] ipc/sem.c: make semctl(,,{GETNCNT,GETZCNT}) standard compliant

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Message-ID: <53744197.7090502@colorfullife.com>
Date:	Thu, 15 May 2014 06:24:55 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>
CC:	Davidlohr Bueso <davidlohr.bueso@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, 1vier1@....de
Subject: Re: [PATCH 6/6] ipc/sem.c: make semctl(,,{GETNCNT,GETZCNT}) standard
 compliant

Hi Andrew,

On 05/15/2014 12:30 AM, Andrew Morton wrote:
> On Wed, 14 May 2014 07:52:38 -0700 Davidlohr Bueso <davidlohr@...com> wrote:
>
>>> -	semcnt = 0;
>>> +	BUG_ON(sop->sem_flg & IPC_NOWAIT);
>>> +	BUG_ON(sop->sem_op > 0);
>> Hmm in light of Linus' recent criticism about randomly sprinkling
>> BUG_ONs in the kernel I'm not sure we want this. Yes, all those calls
>> are correct from a logical pov and should never occur, however, would
>> WARN be more suitable instead? I don't know.
> Well, this BUG_ON is so old that a decent approach would be to just
> delete the thing, if only Manfred wasn't changing stuff.
>
> Yes, if we can reasonably warn-then-recover then I guess that's worth
> doing.
I'll update the series anyway, then I remove the BUG_ONs entirely:
They are just debuging helpers, there is no need to keep them in the 
final code.

--
     Manfred
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