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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,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 19F4BC3A5A4 for ; Mon, 2 Sep 2019 02:04:52 +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 5CBE22184D for ; Mon, 2 Sep 2019 02:04:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5CBE22184D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46MD1D5mNgzDqMd for ; Mon, 2 Sep 2019 12:04:48 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (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 46MCzS51plzDqL8 for ; Mon, 2 Sep 2019 12:03:16 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 46MCzN3t6wz9sBF; Mon, 2 Sep 2019 12:03:12 +1000 (AEST) From: Michael Ellerman To: Michal Suchanek , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH v7 5/6] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default. In-Reply-To: References: Date: Mon, 02 Sep 2019 12:03:12 +1000 Message-ID: <87ftlftpy7.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain 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: Madhavan Srinivasan , David Hildenbrand , Heiko Carstens , Paul Mackerras , Breno Leitao , Michael Neuling , Diana Craciun , Firoz Khan , Hari Bathini , Michal Suchanek , Joel Stanley , Arnd Bergmann , Nicholas Piggin , Alexander Viro , Thomas Gleixner , Allison Randal , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, "Eric W. Biederman" , Andrew Donnellan , linux-fsdevel@vger.kernel.org, Andrew Morton Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Michal Suchanek writes: > On bigendian ppc64 it is common to have 32bit legacy binaries but much > less so on littleendian. I think the toolchain people will tell you that there is no 32-bit little endian ABI defined at all, if anything works it's by accident. So I think we should not make this selectable, unless someone puts their hand up to say they want it and are willing to test it and keep it working. cheers > v3: make configurable > --- > arch/powerpc/Kconfig | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 5bab0bb6b833..b0339e892329 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -264,8 +264,9 @@ config PANIC_TIMEOUT > default 180 > > config COMPAT > - bool > - default y if PPC64 > + bool "Enable support for 32bit binaries" > + depends on PPC64 > + default y if !CPU_LITTLE_ENDIAN > select COMPAT_BINFMT_ELF > select ARCH_WANT_OLD_COMPAT_IPC > select COMPAT_OLD_SIGACTION > -- > 2.22.0 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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,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 EF270C3A5A4 for ; Mon, 2 Sep 2019 02:03:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C71232184D for ; Mon, 2 Sep 2019 02:03:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729027AbfIBCDT (ORCPT ); Sun, 1 Sep 2019 22:03:19 -0400 Received: from bilbo.ozlabs.org ([203.11.71.1]:37003 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728926AbfIBCDS (ORCPT ); Sun, 1 Sep 2019 22:03:18 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 46MCzN3t6wz9sBF; Mon, 2 Sep 2019 12:03:12 +1000 (AEST) From: Michael Ellerman To: Michal Suchanek , linuxppc-dev@lists.ozlabs.org Cc: Michal Suchanek , Benjamin Herrenschmidt , Paul Mackerras , Alexander Viro , Nicholas Piggin , Christophe Leroy , Breno Leitao , Arnd Bergmann , Heiko Carstens , Greg Kroah-Hartman , Firoz Khan , Thomas Gleixner , Joel Stanley , Hari Bathini , Michael Neuling , Andrew Donnellan , Russell Currey , Diana Craciun , "Eric W. Biederman" , David Hildenbrand , Allison Randal , Andrew Morton , Madhavan Srinivasan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Segher Boessenkool Subject: Re: [PATCH v7 5/6] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default. In-Reply-To: References: Date: Mon, 02 Sep 2019 12:03:12 +1000 Message-ID: <87ftlftpy7.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Michal Suchanek writes: > On bigendian ppc64 it is common to have 32bit legacy binaries but much > less so on littleendian. I think the toolchain people will tell you that there is no 32-bit little endian ABI defined at all, if anything works it's by accident. So I think we should not make this selectable, unless someone puts their hand up to say they want it and are willing to test it and keep it working. cheers > v3: make configurable > --- > arch/powerpc/Kconfig | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 5bab0bb6b833..b0339e892329 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -264,8 +264,9 @@ config PANIC_TIMEOUT > default 180 > > config COMPAT > - bool > - default y if PPC64 > + bool "Enable support for 32bit binaries" > + depends on PPC64 > + default y if !CPU_LITTLE_ENDIAN > select COMPAT_BINFMT_ELF > select ARCH_WANT_OLD_COMPAT_IPC > select COMPAT_OLD_SIGACTION > -- > 2.22.0