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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 F20E3C2BA1A for ; Tue, 7 Apr 2020 01:12:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C28F820719 for ; Tue, 7 Apr 2020 01:12:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="LyygrqVL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726386AbgDGBMW (ORCPT ); Mon, 6 Apr 2020 21:12:22 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:45577 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726230AbgDGBMW (ORCPT ); Mon, 6 Apr 2020 21:12:22 -0400 Received: by mail-pf1-f193.google.com with SMTP id r14so3315pfl.12 for ; Mon, 06 Apr 2020 18:12:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:subject:to:cc:references:in-reply-to:mime-version :user-agent:message-id:content-transfer-encoding; bh=3cdUhQp/zpzkOyVvmj6qlGqEL1FKTqwSK/cEYACNo1Q=; b=LyygrqVLrfCaDS6whDZy427nStCSkQikCPbl7Ge2Pwyxch3zVwHf2FLJsU0hlZPvcR OlhmxukFFK1fwQEGP0DWimeobp9vfksZYCn3p+4nh4c5mmrfQT0OnbJOaiea8CjdodHP 8DDp0N5GzuQ1pv1wRQhpVy0GD8CGmahwTjpdxdoAU0YnVIPgyFkPJOTGyvardKU1ZK6q tTRA6d3rdQ/kpdwh3snHMWlADgHvUGQ0s7nGjA9DL8pkynK2v1UnoKxR84ijbzYHCS9x Yx5Sb3hpNCYxDZHF25i7BUUeplUBSOiy+ZaZEHw5/ddzek4O54H6grPHdSnZEdZzYbqh bP8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:subject:to:cc:references:in-reply-to :mime-version:user-agent:message-id:content-transfer-encoding; bh=3cdUhQp/zpzkOyVvmj6qlGqEL1FKTqwSK/cEYACNo1Q=; b=fBZSpjziBLVAIkLsnYzWJ2S2oKZZNK1XDtMN7EnWsHbLfpccpN4EAcxZpwAYaPuJ8E qWfP/kKnCaKkAonHxmvDgYcjeRYhWlmJdO+4ALDe6VR6rTLJPJMdkXn5Zb9kRYL+/XLL fn7nCIMKAkVx8WzljS+9fKt0xpUXjxQAoFMLurM0nRMUID6oExaJr+PMQbv6MwcM7LYd Who3V2eJBQ4jpqD4bMj5IQ+w5Kqb9jxnAbmylWBTwjWiJnrml4V/c9CCCEHz46JalHc7 quEWeFejrkijOUYVv0NxOLQ4GvXkIMsv/Jnehgr1P4KRQBeITm8YNd5jOesRphdGBD9F 5cQQ== X-Gm-Message-State: AGi0PuYvH021jNhX6ZyRa6zbm2SwQCAGXQUsh4UGnFzZaUyXc/pg/ymB zQwteBTe4jgPXRxX/j+11vw= X-Google-Smtp-Source: APiQypLuPGhY0OgC1uV5M40YzrGcLzB+SkCB5iv8ooQ+KJkJlEXTFlZzy8EKLaasRmrLXxN+Ghqf+w== X-Received: by 2002:a62:1c4a:: with SMTP id c71mr172644pfc.58.1586221939248; Mon, 06 Apr 2020 18:12:19 -0700 (PDT) Received: from localhost (60-241-117-97.tpgi.com.au. [60.241.117.97]) by smtp.gmail.com with ESMTPSA id i18sm12785222pfr.62.2020.04.06.18.12.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Apr 2020 18:12:18 -0700 (PDT) Date: Tue, 07 Apr 2020 11:10:54 +1000 From: Nicholas Piggin Subject: Re: [RFC PATCH v3 15/15] powerpc/kernel: Do not inconditionally save non volatile registers on system call To: Benjamin Herrenschmidt , Christophe Leroy , Michael Ellerman , msuchanek@suse.de, Paul Mackerras Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org References: <5aeaa33383e833f6eca30893fbd188b88e019eaa.1586196948.git.christophe.leroy@c-s.fr> <1299b6b50facf78458e7db265fb9936595ea009a.1586196948.git.christophe.leroy@c-s.fr> In-Reply-To: <1299b6b50facf78458e7db265fb9936595ea009a.1586196948.git.christophe.leroy@c-s.fr> MIME-Version: 1.0 User-Agent: astroid/0.15.0 (https://github.com/astroidmail/astroid) Message-Id: <1586221719.pt68ef9jgc.astroid@bobo.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Christophe Leroy's on April 7, 2020 4:16 am: > + ret =3D syscall_exit_prepare_end(ret, regs, ti_flags); > + if (unlikely(ret & 0x80000000)) { > + ret &=3D ~0x80000000; We could just add our own set of defines for these, there's no real reason to use _TIF_RESTOREALL as I had. Thanks, Nick =