From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94B03C19759 for ; Thu, 1 Aug 2019 05:24:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 62B3F2173E for ; Thu, 1 Aug 2019 05:24:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564637044; bh=HDQb70tI5fA9NqOE+dvamkWfpgPoM26ltFSdWMc7wL4=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=YzLlJdp0WfvVrPMMP6cZ49H27uUyWXi6xZ9Lmwp0aTsJyVPZII4G5bIxadp8zIgWm OFDCiozoYnm+nU1ZG+bXW6t1rJ0Yuh9ZehX1ZiPNsNc72CGO+I/ZrCaNsSCtoZadFS GFeHEKA9v9FEbRCN4eKOwJkUcxCsKBRgW/Xbp/Cg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728041AbfHAFYD (ORCPT ); Thu, 1 Aug 2019 01:24:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:42660 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725283AbfHAFYC (ORCPT ); Thu, 1 Aug 2019 01:24:02 -0400 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7F98E2184B for ; Thu, 1 Aug 2019 05:24:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564637041; bh=HDQb70tI5fA9NqOE+dvamkWfpgPoM26ltFSdWMc7wL4=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=2S2olBRv+3MkQY4BmFwPV0uAXo2VHv2CbFq/TKn2uYbqUN+isxeBQhXMNVZEiJgz0 oXEiTGZj6SOcJ8l+tsdQntWRCdrWgV4/9a40Bzi1CjQzmlXcMQdTAfYw+Mnc6ZRWjM Ulg12qsZCR5iBoPpM49K0O5qTTHB5Kg7fsKod01s= Received: by mail-wm1-f48.google.com with SMTP id g67so57806016wme.1 for ; Wed, 31 Jul 2019 22:24:01 -0700 (PDT) X-Gm-Message-State: APjAAAVuJScNTTf1bJUo++1rOTlL3MJpvFLrw30xVuaVc8E8/LcrjsA8 Z28A2YfArfNHxx1Ic8g8CAYP7utyvDM8MN5MTZxmFw== X-Google-Smtp-Source: APXvYqwe9647Ls7CjH1zr/SzdtRdvCPKZd4VYXb1e6vdxjHQpcQDdnw0z/LdvkU3PZ2S0zI2Nclhg8OezGY4DS/y8FU= X-Received: by 2002:a7b:c4d2:: with SMTP id g18mr114656661wmk.79.1564637039930; Wed, 31 Jul 2019 22:23:59 -0700 (PDT) MIME-Version: 1.0 References: <20190729215758.28405-1-dima@arista.com> <20190729215758.28405-22-dima@arista.com> In-Reply-To: <20190729215758.28405-22-dima@arista.com> From: Andy Lutomirski Date: Wed, 31 Jul 2019 22:23:48 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCHv5 21/37] x86/vdso: Restrict splitting VVAR VMA To: Dmitry Safonov Cc: LKML , Dmitry Safonov <0x7f454c46@gmail.com>, Adrian Reber , Andrei Vagin , Andy Lutomirski , Arnd Bergmann , Christian Brauner , Cyrill Gorcunov , "Eric W. Biederman" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Jeff Dike , Oleg Nesterov , Pavel Emelyanov , Shuah Khan , Thomas Gleixner , Vincenzo Frascino , Linux Containers , criu@openvz.org, Linux API , X86 ML Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 29, 2019 at 2:58 PM Dmitry Safonov wrote: > > Although, time namespace can work with VVAR VMA split, it seems worth > to forbid splitting VVAR resulting in stricter ABI and reducing amount > of corner-cases to consider while working further on VDSO. > > I don't think there is any use-case for partial mremap() of vvar, > but if there is any - this patch can be easily reverted. Seems reasonable to me.