From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756566Ab0LQWlf (ORCPT ); Fri, 17 Dec 2010 17:41:35 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:47033 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756397Ab0LQWla (ORCPT ); Fri, 17 Dec 2010 17:41:30 -0500 X-Greylist: delayed 11673 seconds by postgrey-1.27 at vger.kernel.org; Fri, 17 Dec 2010 17:41:30 EST From: ebiederm@xmission.com (Eric W. Biederman) To: Greg KH Cc: "Serge E. Hallyn" , LSM , James Morris , Kees Cook , containers@lists.linux-foundation.org, kernel list , Alexey Dobriyan , Michael Kerrisk References: <20101217152246.GA8221@mail.hallyn.com> <20101217152458.GA11162@mail.hallyn.com> <20101217173125.GA29982@kroah.com> <20101217195829.GB1410@kroah.com> Date: Fri, 17 Dec 2010 12:40:11 -0800 In-Reply-To: <20101217195829.GB1410@kroah.com> (Greg KH's message of "Fri, 17 Dec 2010 11:58:29 -0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=98.207.157.188;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX18D/548hzJooDgVBQYOh9zmYYOIewRo+Vk= X-SA-Exim-Connect-IP: 98.207.157.188 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 1.5 XMNoVowels Alpha-numberic number with no vowels * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -3.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa03 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject * 0.0 T_XMDrugObfuBody_04 obfuscated drug references * 0.4 UNTRUSTED_Relay Comes from a non-trusted relay X-Spam-DCC: XMission; sa03 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;Greg KH X-Spam-Relay-Country: Subject: Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace X-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Fri, 06 Aug 2010 16:31:04 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Greg KH writes: >> There are also major benefits to have the version of something that is >> never freed never going away, because it means you can just reference it >> in code. So while I would be happy to say this is special don't use a >> kref and roll the reference counting logic by hand, we aren't >> dynamically allocating init_uts_ns any time soon. > > Why have a reference count at all if it's not needed or used here? We have to reference count every other uts namespace. Eric