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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT 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 AC763C43387 for ; Thu, 10 Jan 2019 16:59:46 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 35A7620685 for ; Thu, 10 Jan 2019 16:59:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 35A7620685 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43bC0J2S1MzDqP5 for ; Fri, 11 Jan 2019 03:59:44 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=arm.com (client-ip=217.140.101.70; helo=foss.arm.com; envelope-from=will.deacon@arm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=arm.com Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by lists.ozlabs.org (Postfix) with ESMTP id 43bBXl2KSpzDqpM for ; Fri, 11 Jan 2019 03:39:18 +1100 (AEDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6E5D5A78; Thu, 10 Jan 2019 08:39:17 -0800 (PST) Received: from fuggles.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 27BBF3F694; Thu, 10 Jan 2019 08:39:11 -0800 (PST) Date: Thu, 10 Jan 2019 16:39:08 +0000 From: Will Deacon To: Arnd Bergmann Subject: Re: [PATCH 07/15] ARM: add kexec_file_load system call number Message-ID: <20190110163908.GC31683@fuggles.cambridge.arm.com> References: <20190110162435.309262-1-arnd@arndb.de> <20190110162435.309262-8-arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190110162435.309262-8-arnd@arndb.de> User-Agent: Mutt/1.11.1+86 (6f28e57d73f2) () 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: dalias@libc.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, catalin.marinas@arm.com, heiko.carstens@de.ibm.com, linux@dominikbrodowski.net, linux-mips@vger.kernel.org, jcmvbkbc@gmail.com, deepa.kernel@gmail.com, hpa@zytor.com, sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, dave@stgolabs.net, y2038@lists.linaro.org, deller@gmx.de, x86@kernel.org, linux@armlinux.org.uk, mingo@redhat.com, geert@linux-m68k.org, firoz.khan@linaro.org, mattst88@gmail.com, fenghua.yu@intel.com, linux-m68k@lists.linux-m68k.org, ink@jurassic.park.msu.ru, luto@kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, monstr@monstr.eu, tony.luck@intel.com, linux-parisc@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, paul.burton@mips.com, ebiederm@xmission.com, linux-alpha@vger.kernel.org, schwidefsky@de.ibm.com, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Jan 10, 2019 at 05:24:27PM +0100, Arnd Bergmann wrote: > A couple of architectures including arm64 already implement the > kexec_file_load system call, on many others we have assigned a system > call number for it, but not implemented it yet. > > Adding the number in arch/arm/ lets us use the system call on arm64 > systems in compat mode, and also reduces the number of differences > between architectures. If we want to implement kexec_file_load on ARM > in the future, the number assignment means that kexec tools can already > be built with the now current set of kernel headers. > > Signed-off-by: Arnd Bergmann > --- > arch/arm/tools/syscall.tbl | 1 + > arch/arm64/include/asm/unistd.h | 2 +- > arch/arm64/include/asm/unistd32.h | 2 ++ > 3 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl > index 86de9eb34296..20ed7e026723 100644 > --- a/arch/arm/tools/syscall.tbl > +++ b/arch/arm/tools/syscall.tbl > @@ -415,3 +415,4 @@ > 398 common rseq sys_rseq > 399 common io_pgetevents sys_io_pgetevents > 400 common migrate_pages sys_migrate_pages > +401 common kexec_file_load sys_kexec_file_load > diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h > index 261216c3336e..2c30e6f145ff 100644 > --- a/arch/arm64/include/asm/unistd.h > +++ b/arch/arm64/include/asm/unistd.h > @@ -44,7 +44,7 @@ > #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5) > #define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800) > > -#define __NR_compat_syscalls 401 > +#define __NR_compat_syscalls 402 > #endif > > #define __ARCH_WANT_SYS_CLONE > 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? Will