linux-kernel - Re: [PATCH 2/4 v6] kernel/fork.c: avoid division by zero

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Message-ID: <20150318170655.GA30545@redhat.com>
Date:	Wed, 18 Mar 2015 18:06:55 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Heinrich Schuchardt <xypron.glpk@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Aaron Tomlin <atomlin@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Davidlohr Bueso <dave@...olabs.net>,
	David Rientjes <rientjes@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Fabian Frederick <fabf@...net.be>,
	Guenter Roeck <linux@...ck-us.net>,
	"H. Peter Anvin" <hpa@...or.com>, Jens Axboe <axboe@...com>,
	Joe Perches <joe@...ches.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jonathan Corbet <corbet@....net>,
	Kees Cook <keescook@...omium.org>,
	Michael Marineau <mike@...ineau.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vladimir Davydov <vdavydov@...allels.com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/4 v6] kernel/fork.c: avoid division by zero

On 03/18, Ingo Molnar wrote:
>
> But ... no strong feelings from me, I'm not NAK-ing it or anything,
> maybe I'd have used this well-known pattern:
>
> 	threads = min(max(MIN_THREADS, threads), MAX_THREADS);
>
> instead of:
>
> > >> +	if (threads > MAX_THREADS)
> > >> +		threads = MAX_THREADS;
> > >> +
> > >> +	if (threads < MIN_THREADS)
> > >> +		threads = MIN_THREADS;

	clamp(threads, MIN_THREADS, MAX_THREADS)

;)

Oleg.

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