From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933568AbbA2CMf (ORCPT ); Wed, 28 Jan 2015 21:12:35 -0500 Received: from mout.kundenserver.de ([212.227.17.24]:53658 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933537AbbA2CMd (ORCPT ); Wed, 28 Jan 2015 21:12:33 -0500 From: Arnd Bergmann To: linaro-kernel@lists.linaro.org Cc: Timur Tabi , AKASHI Takahiro , rgb@redhat.com, Catalin Marinas , lkml , eparis@redhat.com, Al Viro , linux-audit@redhat.com, "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v10 1/3] arm64: Add __NR_* definitions for compat syscalls Date: Wed, 28 Jan 2015 22:35:01 +0100 Message-ID: <12610204.3KbMJUth1j@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: References: <1404458911-8214-1-git-send-email-takahiro.akashi@linaro.org> <1404458911-8214-2-git-send-email-takahiro.akashi@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:3YIGh/+CVKefHS/feNyHiQ0MvnBLg0hnqB+7H6AFiJFtfgXZibE DID089RvCPhJ3183jyFnqXwbbop7uKlXycuBNb8qaj+ytqgcyWFo2ju2XVrtYW+BFv22RmU X0OZdTmOhvZtcdDF3EwDRviZzA4HppZS/Bm+LDZFi0+Pkl/oilka8GOylGeHEoNUwttkNuM VH8cWh+xCGJbUFdDrDVGg== X-UI-Out-Filterresults: notjunk:1; Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 28 January 2015 15:31:49 Timur Tabi wrote: > On Fri, Jul 4, 2014 at 2:28 AM, AKASHI Takahiro > wrote: > > +#define __ARM_NR_COMPAT_BASE 0x0f0000 > > +#define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE+2) > > +#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE+5) > > I know this patch is six months old, but I was wondering if anyone > knows of any plans to make these syscalls available to 64-bit apps? > We have a 32-bit app that uses __ARM_NR_compat_cacheflush, and we'd > like to port that app to 64-bit. I'm just not sure how to start doing > that, since there don't appear to be any 64-bit ARM-specific syscalls. > You can add architecture specific syscalls by using the 16 numbers following __NR_arch_specific_syscall. Whether it makes sense to have a cacheflush syscall on arm64, I have no idea. I believe that we should not need a set_tls syscall though. Arnd