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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id EA441CAC592 for ; Fri, 19 Sep 2025 20:56:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:In-Reply-To:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=oPOJPtOvTduMCDEshW7LzFr/+4LF+l++VAPKpYOlvbk=; b=2BE8qy7SdUjCw9qAWn7WNuovDE lwOq4ffQpAgqrNDdBJuKjYAHrR/P5eSNTRYhTy5y02SDrrzBfs2VfMHkKh29V5sstjzagxhwdUZuS U6P9YwMpDdBtcmDJL4iQOB1P02BtTpWcs5nUmcmdQBOpP+/42ii11TXNxZ9rC5MTehiLqNs0fQFCI AnljcW8BcC3aZGnJRahsCZr+urxXQlVEeBb9ap9tHZQPBwQnx6AeHJzggyH0IShwE+g6u9NHEYYBw Bizw0g2mOKu5fK1+UvfqWbtzQ9O6naR23PRpLWnf+Syb8MLqCEi7kzbF2CAXZ6+ctGrdlTSmtnEN0 hj5yCQdA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzi9P-000000041bQ-1QkE; Fri, 19 Sep 2025 20:56:15 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzi9O-000000041bJ-0nCH for linux-arm-kernel@lists.infradead.org; Fri, 19 Sep 2025 20:56:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 9DA8D6013A; Fri, 19 Sep 2025 20:56:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F068C4CEF0; Fri, 19 Sep 2025 20:56:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758315373; bh=kOWQSdwNcpamYEya4x62s60zaUfV/v+AE/sXrB6Mnq8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=aKjIwtJPFZpsW/f4SRODMyE0Wa0LuvERp7D0nJTFe6Rgrdrq1dKt5hc0XRXJZTP12 dNn2dwcgFQ7k9WdhkdOpERbMYKwYCrGW4jYz+AyWsXCD0gJEAXzbvWYc/2DGf5fjOM tJZF8hksBr9Pf71A8aZHYYWyujq549vNFmXikfXe/OD7R2gD3EmoS6t+6H38m1DIJ/ TL/Rvd/bbybVs6KodecaH7wAlo5IM0SMCarujBeouZgzsxznP5w8i4Mw8JmpW7+WX8 ytOyZ65CE/+wqRR5rXjoRFvVjRR65elI9J+/3gPRYoKG+EwOARJM8M0IMalk0ZFwzu V4qPX2hm8KOtA== Received: from sofa.misterjones.org ([185.219.108.64] helo=lobster-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1uzi9K-00000007tMO-3hql; Fri, 19 Sep 2025 20:56:10 +0000 Date: Fri, 19 Sep 2025 21:56:10 +0100 Message-ID: <87v7lexitx.wl-maz@kernel.org> From: Marc Zyngier To: Will Deacon Cc: linux-arm-kernel@lists.infradead.org, Catalin Marinas , Ard Biesheuvel , Arnd Bergmann , Hanjun Guo , Jonathan Cameron , Guenter Roeck Subject: Re: [PATCH] arm64: Kconfig: Make CPU_BIG_ENDIAN depend on BROKEN In-Reply-To: <20250919184025.15416-1-will@kernel.org> References: <20250919184025.15416-1-will@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: will@kernel.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, ardb@kernel.org, arnd@arndb.de, guohanjun@huawei.com, Jonathan.Cameron@huawei.com, linux@roeck-us.net X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 19 Sep 2025 19:40:25 +0100, Will Deacon wrote: > > Big-endian arm64 configurations are vanishingly rare, yet we still claim > to support them in Linux despite very limited testing or visible > interest. Supporting big-endian adds unnecessary burden to reviewers and > contributors which, without any known active users, is hard to justify. > For example, recent work to improve our futex routines and to implement > nested virtualisation support is non-trivially complicated by having to > support both big- and little-endianness. > > Back in 2019 [1], it was claimed that Huawei were using arm64 big-endian > machines in their telecommunication products but I don't know whether > that's still the case and certainly haven't seen any patch contributions > to help support or maintain it. > > Make CPU_BIG_ENDIAN depend on BROKEN as an initial deprecation step > towards its removal. > > Cc: Catalin Marinas > Cc: Marc Zyngier > Cc: Ard Biesheuvel > Cc: Arnd Bergmann > Cc: Hanjun Guo > Cc: Jonathan Cameron > Cc: Guenter Roeck > Link: https://lore.kernel.org/linux-arm-kernel/73701e9f-bee1-7ae8-2277-7a3576171cd4@huawei.com/ [1] > Signed-off-by: Will Deacon It's about time. Acked-by: Marc Zyngier M. -- Jazz isn't dead. It just smells funny.