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=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham 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 2BC5AC43381 for ; Mon, 18 Mar 2019 17:33:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F02E620854 for ; Mon, 18 Mar 2019 17:33:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="XrnfO4Zn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F02E620854 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=a7aTDsJ7pgmMlfmpD+hG5YGKnl5WrQgUNHRXKERNPng=; b=XrnfO4ZnkaSvJ9 cNCf+jOvITI8cpAD3t0d5SkZypOfQT1wgZuO6a1rL3YbMYDbG30Ipo4zZsk5tNLRSv5kJQMAM4EeH l1a47b+QfDY4U8KiPIBLD83mYMWqswI0byjsj6hfg1R8/gWNAAQEVoCprZflBS8JpuMPerqCAENNc wG2wGQJDd9JGxbnWCHyO4XplVOFhuKrUz2t8U2ZU5nwsxccSH3Lg8Gtx7mpEl4WhLMNXykWmVEtUJ 5DmVHsCzSy/jjdfTx3twl7mWT7S8n1vkH7zrCE98eYSpCheiVn+eJnDMLB3axWeaIt6q7tCIuRUIs Qrwq7lzJhn6/fZmErKmQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h5w8y-0004ml-Oy; Mon, 18 Mar 2019 17:33:48 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1h5w8w-0004mR-CL for linux-arm-kernel@lists.infradead.org; Mon, 18 Mar 2019 17:33:47 +0000 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 944DA3082E55; Mon, 18 Mar 2019 17:33:45 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.43.17.34]) by smtp.corp.redhat.com (Postfix) with SMTP id 7FFE627CC2; Mon, 18 Mar 2019 17:33:42 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 18 Mar 2019 18:33:45 +0100 (CET) Date: Mon, 18 Mar 2019 18:33:41 +0100 From: Oleg Nesterov To: Sudeep Holla Subject: Re: [PATCH v2 4/6] powerpc: use common ptrace_syscall_enter hook to handle _TIF_SYSCALL_EMU Message-ID: <20190318173341.GD23521@redhat.com> References: <20190318104925.16600-1-sudeep.holla@arm.com> <20190318104925.16600-5-sudeep.holla@arm.com> <20190318172024.GB23521@redhat.com> <20190318172457.GD18196@e107155-lin> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190318172457.GD18196@e107155-lin> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Mon, 18 Mar 2019 17:33:45 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190318_103346_442046_FA956981 X-CRM114-Status: GOOD ( 14.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Haibo Xu , Steve Capper , Catalin Marinas , jdike@addtoit.com, x86@kernel.org, Will Deacon , linux-kernel@vger.kernel.org, Bin Lu , Richard Weinberger , Ingo Molnar , Paul Mackerras , Andy Lutomirski , Michael Ellerman , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/18, Sudeep Holla wrote: > > On Mon, Mar 18, 2019 at 06:20:24PM +0100, Oleg Nesterov wrote: > > > > Again, to me this patch just makes the code look worse. Honestly, I don't > > think that the new (badly named) ptrace_syscall_enter() hook makes any sense. > > > > Worse because we end up reading current_thread_info->flags twice ? Mostly because in my opinion ptrace_syscall_enter() buys nothing but makes the caller's code less readable/understandable. Sure, this is subjective. Oleg. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel