Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754358AbaDRRvK (ORCPT ); Fri, 18 Apr 2014 13:51:10 -0400 Received: from mail-ee0-f52.google.com ([74.125.83.52]:56767 "EHLO mail-ee0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754212AbaDRRvI (ORCPT ); Fri, 18 Apr 2014 13:51:08 -0400 Message-ID: <53516608.8090409@colorfullife.com> Date: Fri, 18 Apr 2014 19:51:04 +0200 From: Manfred Spraul User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: mtk.manpages@gmail.com CC: Davidlohr Bueso , Andrew Morton , KOSAKI Motohiro , Kamezawa Hiroyuki , Greg Thelen , aswin@hp.com, LKML , "linux-mm@kvack.org" , Linux API Subject: Re: [PATCH v3] ipc,shm: disable shmmax and shmall by default References: <1397784345.2556.26.camel@buesod1.americas.hpqcorp.net> <5350EFAA.2030607@colorfullife.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/18/2014 05:36 PM, Michael Kerrisk (man-pages) wrote: > On Fri, Apr 18, 2014 at 11:26 AM, Manfred Spraul > wrote: >> Obviously my patch has the opposite problem: 64-bit wrap-arounds. > I know you alluded to a case in another thread, but I couldn't quite > work out from the mail you referred to whether this was really the > problem. (And I assume those folks were forced to fix their set-up > scripts anyway.) So, it's not clear to me whether this is a real > problem. (And your patch does not worsen things from the current > situation, right?) a) When I wrote the comment it was just an idea. But now I think wrap-around could be an issue, e.g. find_vma_intersection(,addr,addr+ULONG_MAX) always returns false, even if there are vmas inbetween. b) If we make ULONG_MAX the default, then it should work. -- Manfred -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/