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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 15974C77B7A for ; Tue, 16 May 2023 10:44:33 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4QLCXw1kgLz3fBm for ; Tue, 16 May 2023 20:44:32 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=desiato.20200630 header.b=FkkqeXjy; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=infradead.org (client-ip=2001:8b0:10b:1:d65d:64ff:fe57:4e05; helo=desiato.infradead.org; envelope-from=peterz@infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=desiato.20200630 header.b=FkkqeXjy; dkim-atps=neutral Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4QLCWy3k06z3bZv for ; Tue, 16 May 2023 20:43:40 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=aFE52arMbeuGVCs81HtFqwlRw7vUUbocXdncBereG0Q=; b=FkkqeXjyINXcZ0dn67fZnclgj5 cM/jyQTU2OOfVb/EiYFiDE06liJQP27KDAcpUH/jvL5QV5T8XRtCJzU+4kg1GW4V/NzKuN4GPJCdQ 0sqkIOfozkG/6bRoKC331l4E55SrRg5QgVT5Oax7JRzQ8FaceCgUVhX3+9fgImj0uvsScOdj/gykc BiRVVw7g07fwYDhA/dioi9Gx9dHD4NjilKqhgdxQMUfWU0+KUYPlLl+nB8lai821mGMHryLvk+NSQ Eh+gOFJ/bYjCd1MgOmvB2ulDNpaXZcyForWW7zbsHFkP4U9F6xTP8XOIUJ9iT/VeLM4yXgttg5d8o HZ+p+e2A==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pys7y-00C5WG-2z; Tue, 16 May 2023 10:41:59 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id D21DF30008D; Tue, 16 May 2023 12:41:52 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A9E932013503C; Tue, 16 May 2023 12:41:52 +0200 (CEST) Date: Tue, 16 May 2023 12:41:52 +0200 From: Peter Zijlstra To: Matthew Wilcox Subject: Re: [PATCH 00/23] arch: allow pte_offset_map[_lock]() to fail Message-ID: <20230516104152.GH2587705@hirez.programming.kicks-ass.net> References: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: Michel Lespinasse , linux-ia64@vger.kernel.org, David Hildenbrand , Catalin Marinas , Qi Zheng , linux-kernel@vger.kernel.org, Max Filippov , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Claudio Imbrenda , Will Deacon , Greg Ungerer , linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, Helge Deller , x86@kernel.org, Hugh Dickins , Russell King , Geert Uytterhoeven , Christian Borntraeger , Alexandre Ghiti , Heiko Carstens , linux-m68k@lists.linux-m68k.org, John Paul Adrian Glaubitz , John David Anglin , Suren Baghdasaryan , linux-arm-kernel@lists.infradead.org, Chris Zankel , Michal Simek , Thomas Bogendoerfer , linux-parisc@vger.kernel.org, linux-mm@kvack.org, linux-mips@vger.kernel.org, Palmer Dabbelt , "Kirill A. Shutemov" , "Aneesh Kumar K.V" , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , Mike Rapoport , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, May 11, 2023 at 03:02:55PM +0100, Matthew Wilcox wrote: > We also talked about moving x86 to always RCU-free page tables in > order to make accessing /proc/$pid/smaps lockless. I believe Michel > is going to take a swing at this project. Shouldn't be too controversial I think -- effectively everybody already has it enabled because everybody builds with KVM enabled.