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=-8.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_PASS,URIBL_BLOCKED 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 94E6DC43387 for ; Thu, 10 Jan 2019 17:15:12 +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 623F02177B for ; Thu, 10 Jan 2019 17:15:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="X+rKGglK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 623F02177B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arndb.de 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:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PsPREz7I/4cwpRp64skIzNz0Rbw916Aocn7AcZCkuDA=; b=X+rKGglKwzxJ6e Gu8KDgdA30REfDRLb1VenVGmPXMOFgCbDPsicLEiP+Zpvhha3BoMGhov/OfBIiGgQNNCxX4+gIIQ6 WNdgx9D5QHvwOqgMV8ZTSCJtjwIGTRYmilz6Zj4iQ66qqy8/hQ0v9y1IalCgQoro+D2BPWICqWij8 ocLJNIIofqKktjEOoMP+a4uRUQC2PTKYhBOT2PdlrCny+sS11x/Z/NVDU/LEDmRpX+exk8ja1Bkhu m2fiF6FmKitn9Sb3bpdqzVz8fbSGGNUCrIB6z97WdbrDlXPiQ2SKFC5vScpQ+KakSpIY2Pg3AHnqF 6C92gFGdD3jXrhOO2Mdw==; 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 1ghdvC-000512-HG; Thu, 10 Jan 2019 17:15:10 +0000 Received: from mail-qt1-f196.google.com ([209.85.160.196]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1ghdv9-0004TD-GY for linux-arm-kernel@lists.infradead.org; Thu, 10 Jan 2019 17:15:08 +0000 Received: by mail-qt1-f196.google.com with SMTP id y20so14015828qtm.13 for ; Thu, 10 Jan 2019 09:15:07 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Vi+SvwsycUKtGhpMC3QEpN/Bk6bKq1AfTBDWYF1k7VQ=; b=HoA42E6NYJh50vhm7/iatsKmB7nE1FBkXEZfHLL6tocnzjjhLGdxaNpkNJKo8cPOQb ghHuPHs+LPDUQdr8T+6cRNTSFMOi+xFEXKZp62HkYwo+BNqAa3n+WIWx6S5SXDg9O6+e y6SqcTt3uAjfqWsznhQwd9FElfLjcOgNFH5tIV5nejW8kF9ZgSOTe21jtMVMvw7ZFL32 Jyrc+iBHmO0r5hUpwoNH2ewsCOkPNm9TWB6FNpi1gs6RTQQpgg1u4pG8LI968+WPYySI JRql39YI+scMd+39Qn5NiT14GzfWiQm9K+hvmKt3/bt2m9GW4Gfn+xee4N8/ilss6ZJQ zsWg== X-Gm-Message-State: AJcUukcjJ+MhN8jWJvIW1HQ9qDx4CXaTdShP3utRqjNrP0+FxHoMJNNw OGkBsr7xJDCjS68rL5d381q1u5FVZnFjRPcytZI= X-Google-Smtp-Source: ALg8bN4AdylggnguSr7egu7xIPGdOjTe436nAOiytiob3A7SfzgpinZUkBcCe85tXDNMw1nvzwC1nAoiCh7sWU6vHE4= X-Received: by 2002:ac8:1d12:: with SMTP id d18mr10355152qtl.343.1547140506273; Thu, 10 Jan 2019 09:15:06 -0800 (PST) MIME-Version: 1.0 References: <20190110162435.309262-1-arnd@arndb.de> <20190110162435.309262-8-arnd@arndb.de> <20190110163908.GC31683@fuggles.cambridge.arm.com> In-Reply-To: <20190110163908.GC31683@fuggles.cambridge.arm.com> From: Arnd Bergmann Date: Thu, 10 Jan 2019 18:14:50 +0100 Message-ID: Subject: Re: [PATCH 07/15] ARM: add kexec_file_load system call number To: Will Deacon X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190110_091507_560663_B875391A X-CRM114-Status: GOOD ( 15.40 ) 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: Rich Felker , linux-ia64@vger.kernel.org, Linux-sh list , Catalin Marinas , Heiko Carstens , Dominik Brodowski , linux-mips@vger.kernel.org, Max Filippov , Deepa Dinamani , "H. Peter Anvin" , sparclinux , linux-s390 , Davidlohr Bueso , y2038 Mailman List , Michael Ellerman , Helge Deller , the arch/x86 maintainers , Russell King - ARM Linux , Ingo Molnar , Geert Uytterhoeven , Firoz Khan , Matt Turner , Fenghua Yu , linux-m68k , Ivan Kokshaysky , Andy Lutomirski , Thomas Gleixner , Linux ARM , Michal Simek , Tony Luck , Parisc List , Linux API , Linux Kernel Mailing List , Paul Burton , "Eric W . Biederman" , alpha , Martin Schwidefsky , Andrew Morton , linuxppc-dev , David Miller 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 Thu, Jan 10, 2019 at 5:39 PM Will Deacon wrote: > > > diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h > > index 355fe2bc035b..19f3f58b6146 100644 > > --- a/arch/arm64/include/asm/unistd32.h > > +++ b/arch/arm64/include/asm/unistd32.h > > @@ -823,6 +823,8 @@ __SYSCALL(__NR_rseq, sys_rseq) > > __SYSCALL(__NR_io_pgetevents, compat_sys_io_pgetevents) > > #define __NR_migrate_pages 400 > > __SYSCALL(__NR_migrate_pages, sys_migrate_pages) > > +#define __NR_kexec_file_load 401 > > +__SYSCALL(__NR_kexec_file_load, sys_kexec_file_load) > > Hmm, I wonder if we need a compat wrapper for this, or are we assuming > that the early entry code has already zero-extended the long and pointer > arguments? Yes, that is generally the assumption for compat syscalls. s390 needs some extra magic to do a 31-to-64 extension on pointer arguments, and I think sometimes we need a special wrapper to do sign-extension of 32-bit arguments into 64-bit, but the arguments here should not need that. Arnd _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel