From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Nikita V. Youshchenko" Subject: Re: [PATCH v18 49/80] c/r: support for UTS namespace Date: Tue, 29 Sep 2009 22:13:17 +0400 Message-ID: <200909292213.21266@blacky.localdomain> References: <1253749920-18673-1-git-send-email-orenl@librato.com> <1253749920-18673-50-git-send-email-orenl@librato.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1253749920-18673-50-git-send-email-orenl@librato.com> Content-Disposition: inline Sender: owner-linux-mm@kvack.org To: Oren Laadan Cc: Andrew Morton , containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Serge Hallyn , Ingo Molnar , Pavel Emelyanov , Dan Smith , Oren Laadan List-Id: linux-api@vger.kernel.org > +static struct uts_namespace *do_restore_uts_ns(struct ckpt_ctx *ctx) > ... > +#ifdef CONFIG_UTS_NS > + uts_ns = create_uts_ns(); > + if (!uts_ns) { > + uts_ns = ERR_PTR(-ENOMEM); > + goto out; > + } > + down_read(&uts_sem); > + name = &uts_ns->name; > + memcpy(name->sysname, h->sysname, sizeof(name->sysname)); > + memcpy(name->nodename, h->nodename, sizeof(name->nodename)); > + memcpy(name->release, h->release, sizeof(name->release)); > + memcpy(name->version, h->version, sizeof(name->version)); > + memcpy(name->machine, h->machine, sizeof(name->machine)); > + memcpy(name->domainname, h->domainname, sizeof(name->domainname)); > + up_read(&uts_sem); Could you please explain what for is this down_read() / up_read() ? You operate only on local objects: 'name' points to just-created uts_ns, 'h' is also local data. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org