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=-17.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 3F963C433F5 for ; Mon, 13 Sep 2021 17:15:31 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 8BE5361056 for ; Mon, 13 Sep 2021 17:15:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8BE5361056 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csgroup.eu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4H7Y5Y0l9Zz30Qv for ; Tue, 14 Sep 2021 03:15:29 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=csgroup.eu (client-ip=93.17.235.10; helo=pegase2.c-s.fr; envelope-from=christophe.leroy@csgroup.eu; receiver=) Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4H7Y511JN4z2yHw for ; Tue, 14 Sep 2021 03:14:59 +1000 (AEST) Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4H7Y4w5GKJz9sTs; Mon, 13 Sep 2021 19:14:56 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id N7hGuJ2nnmOP; Mon, 13 Sep 2021 19:14:56 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4H7Y4w4Gd4z9sTr; Mon, 13 Sep 2021 19:14:56 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 7402F8B76E; Mon, 13 Sep 2021 19:14:56 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id DHIZJjoe87a4; Mon, 13 Sep 2021 19:14:56 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.204.172]) by messagerie.si.c-s.fr (Postfix) with ESMTP id DCC9D8B763; Mon, 13 Sep 2021 19:14:55 +0200 (CEST) Subject: Re: [PATCH RESEND v3 6/6] powerpc/signal: Use unsafe_copy_siginfo_to_user() To: "Eric W. Biederman" References: <1718f38859d5366f82d5bef531f255cedf537b5d.1631537060.git.christophe.leroy@csgroup.eu> <2b179deba4fd4ec0868cdc48a0230dfa3aa5a22f.1631537060.git.christophe.leroy@csgroup.eu> <87h7eopixa.fsf@disp2133> From: Christophe Leroy Message-ID: Date: Mon, 13 Sep 2021 19:14:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <87h7eopixa.fsf@disp2133> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr-FR Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, hch@infradead.org, Paul Mackerras , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Le 13/09/2021 à 17:57, Eric W. Biederman a écrit : > Christophe Leroy writes: > >> Use unsafe_copy_siginfo_to_user() in order to do the copy >> within the user access block. >> >> On an mpc 8321 (book3s/32) the improvment is about 5% on a process >> sending a signal to itself. >> >> Signed-off-by: Christophe Leroy >> --- >> v3: Don't leave compat aside, use the new unsafe_copy_siginfo_to_user32() >> --- >> arch/powerpc/kernel/signal_32.c | 8 +++----- >> arch/powerpc/kernel/signal_64.c | 5 +---- >> 2 files changed, 4 insertions(+), 9 deletions(-) >> >> diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c >> index ff101e2b3bab..3a2db8af2d65 100644 >> --- a/arch/powerpc/kernel/signal_32.c >> +++ b/arch/powerpc/kernel/signal_32.c >> @@ -710,9 +710,9 @@ static long restore_tm_user_regs(struct pt_regs *regs, struct mcontext __user *s >> } >> #endif >> >> -#ifdef CONFIG_PPC64 >> +#ifndef CONFIG_PPC64 >> >> -#define copy_siginfo_to_user copy_siginfo_to_user32 >> +#define unsafe_copy_siginfo_to_user32 unsafe_copy_siginfo_to_user >> >> #endif /* CONFIG_PPC64 */ > > Any particular reason to reverse the sense of this #ifdef? Yes I had double definition of unsafe_copy_siginfo_to_user(), I could have ifdefed out unsafe_copy_siginfo_to_user() in signal.h, but I prefered to ifdef out copy_siginfo_to_user32() in compat.h > > Otherwise this change looks much cleaner. Thanks Christophe