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=-6.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 61B7AC388F2 for ; Mon, 2 Nov 2020 15:20:57 +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 CCC182225E for ; Mon, 2 Nov 2020 15:20:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="tYvaG/9d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CCC182225E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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 4CPxSh5700zDqSc for ; Tue, 3 Nov 2020 02:20:52 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=rppt@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=tYvaG/9d; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4CPxLh6TW6zDqRG for ; Tue, 3 Nov 2020 02:15:40 +1100 (AEDT) Received: from kernel.org (unknown [87.71.17.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 30D5B21556; Mon, 2 Nov 2020 15:15:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604330137; bh=HUTlle6eGdFGRRBi2JxylJ6R01dvNLPTF9EEu8JnDzk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=tYvaG/9dInW01K1TdO7aN/JE/ddj5YkjOdNNg69Vx3IMO/KyPHo+L3t750XHeB7cy 9nHtZ/YgWXPmU7Jf3+rHocYXndpyDvstMLn2JsE5CdJ3oN4Ef/dmiDi3mtetYWFv3p XYQkck9tVbbZ/n1Alyl03sGboOgOce0/AdowI7CE= Date: Mon, 2 Nov 2020 17:15:24 +0200 From: Mike Rapoport To: David Hildenbrand Subject: Re: [PATCH v3 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC Message-ID: <20201102151524.GB4879@kernel.org> References: <20201101170815.9795-1-rppt@kernel.org> <20201101170815.9795-4-rppt@kernel.org> <8eac2aa4-114e-f981-c8f8-ad8523175cf8@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8eac2aa4-114e-f981-c8f8-ad8523175cf8@redhat.com> 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: Peter Zijlstra , Dave Hansen , linux-mm@kvack.org, Paul Mackerras , Pavel Machek , "H. Peter Anvin" , sparclinux@vger.kernel.org, Christoph Lameter , Will Deacon , linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, x86@kernel.org, Mike Rapoport , Christian Borntraeger , Ingo Molnar , Catalin Marinas , Len Brown , Albert Ou , Vasily Gorbik , linux-pm@vger.kernel.org, Heiko Carstens , David Rientjes , Borislav Petkov , Andy Lutomirski , Paul Walmsley , "Kirill A. Shutemov" , Thomas Gleixner , Joonsoo Kim , linux-arm-kernel@lists.infradead.org, "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Pekka Enberg , Palmer Dabbelt , Andrew Morton , "Edgecombe, Rick P" , linuxppc-dev@lists.ozlabs.org, "David S. Miller" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Nov 02, 2020 at 10:23:20AM +0100, David Hildenbrand wrote: > > > int __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address, > > unsigned numpages, unsigned long page_flags) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > > index 14e397f3752c..ab0ef6bd351d 100644 > > --- a/include/linux/mm.h > > +++ b/include/linux/mm.h > > @@ -2924,7 +2924,11 @@ static inline bool debug_pagealloc_enabled_static(void) > > return static_branch_unlikely(&_debug_pagealloc_enabled); > > } > > -#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_ARCH_HAS_SET_DIRECT_MAP) > > +#ifdef CONFIG_DEBUG_PAGEALLOC > > +/* > > + * To support DEBUG_PAGEALLOC architecture must ensure that > > + * __kernel_map_pages() never fails > > Maybe add here, that this implies mapping everything via PTEs during boot. This is more of an implementation detail, while assumption that __kernel_map_pages() does not fail is somewhat a requirement :) > Acked-by: David Hildenbrand Thanks! > -- > Thanks, > > David / dhildenb > -- Sincerely yours, Mike.