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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 84D9AE78D40 for ; Mon, 9 Feb 2026 08:41:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5D5866B0005; Mon, 9 Feb 2026 03:41:16 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 583906B0088; Mon, 9 Feb 2026 03:41:16 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 43A9A6B0089; Mon, 9 Feb 2026 03:41:16 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 336056B0005 for ; Mon, 9 Feb 2026 03:41:16 -0500 (EST) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id BCD15160701 for ; Mon, 9 Feb 2026 08:41:15 +0000 (UTC) X-FDA: 84424273710.02.30E9FC8 Received: from smtp-out3.simply.com (smtp-out3.simply.com [94.231.106.210]) by imf11.hostedemail.com (Postfix) with ESMTP id A6F484000A for ; Mon, 9 Feb 2026 08:41:13 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=none ("invalid DKIM record") header.d=gaisler.com header.s=simplycom2 header.b=OzGhPxF4; dmarc=pass (policy=none) header.from=gaisler.com; spf=pass (imf11.hostedemail.com: domain of andreas@gaisler.com designates 94.231.106.210 as permitted sender) smtp.mailfrom=andreas@gaisler.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770626474; a=rsa-sha256; cv=none; b=rV0cHZJ72bqVkahgoASsLHgUX2WThwp/HzLAajQijELMEVKhQjoh+Bzu3Iopo+7kTazurZ a5TyTxFeS/v17LkTGRjU97y2o7n9bBfSvn3fSqQTzE7k9BcokiGcCCukdfcUbr4ztMuqgY VW1NwiZ3Illo3bSKsW2dEHvSHK+ep9c= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=none ("invalid DKIM record") header.d=gaisler.com header.s=simplycom2 header.b=OzGhPxF4; dmarc=pass (policy=none) header.from=gaisler.com; spf=pass (imf11.hostedemail.com: domain of andreas@gaisler.com designates 94.231.106.210 as permitted sender) smtp.mailfrom=andreas@gaisler.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1770626474; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=RbC+RKpRL3vyZA9rhFwXc+s3LnlBOMIWZ1+a+rfNhok=; b=uZU2HEMsLYGERKSaYEAqg9v7ThQA1pB0smbK+07mscedDKfoXcjhbitxXaeCMciMd4CAv5 RjPSXJPraSOUxu+MTkLV6cldciqw05VIsrOI3ZCvXIfGt9/djR5LzWwtyExBcJ9dUxtlM3 r7YEuW8J2BNQc/SvKyHGkChTBTxZ01s= Received: from localhost (localhost [127.0.0.1]) by smtp.simply.com (Simply.com) with ESMTP id 4f8dT36VdGz1DDdY; Mon, 9 Feb 2026 09:41:11 +0100 (CET) Received: from [10.10.15.18] (h-98-128-223-123.NA.cust.bahnhof.se [98.128.223.123]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by smtp.simply.com (Simply.com) with ESMTPSA id 4f8dT110xZz1DDXf; Mon, 9 Feb 2026 09:41:09 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gaisler.com; s=simplycom2; t=1770626471; bh=RbC+RKpRL3vyZA9rhFwXc+s3LnlBOMIWZ1+a+rfNhok=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=OzGhPxF4b1JTlL0uvUgojBuLGl/d8Dy9MJzVSCLeT/MydG7knOZy+3rxTsSLXE0fa Fe8HpYTWVqRUTnGYcY3oAZB1G1mG+IVuTFOS7+WqJBz1ilC5nvTR8TovjKYRzf+P2w Ww4xwxi029qA+7zIuREjyi1oyTjnneeeu19Nl05HHLco+NvnhYBsugXIxVmZ8+yauy xXkbpOW82Lh5ONVHEwDikWUcNveQWPl7uCMf/FTqxIDhDMLT/JU43EG3ChwZ3W9qcL 8U/FowPM9gwj9XED74iSkSmiVCadg33Ys0HHbcY4Truz0z7WWFA4WvlePWVs4XcxTs tU6jXEQEdNbzw== Message-ID: <55bef6c2-de81-4b60-b6df-5ef733b54dee@gaisler.com> Date: Mon, 9 Feb 2026 09:41:08 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH mm-unstable] arch, mm: consolidate empty_zero_page To: Mike Rapoport Cc: Andrew Morton , Borislav Petkov , Brian Cain , Catalin Marinas , "David S. Miller" , Dave Hansen , David Hildenbrand , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Palmer Dabbelt , Richard Weinberger , Russell King , Stafford Horne , Suren Baghdasaryan , Thomas Gleixner , Vineet Gupta , Vlastimil Babka , Will Deacon , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org References: <20260124095628.668870-1-rppt@kernel.org> <2157220c-0394-40fa-9918-a8514171bd10@gaisler.com> Content-Language: en-US From: Andreas Larsson In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A6F484000A X-Stat-Signature: kk64bwetyjh8uc34nmwhshgmrxf61br8 X-HE-Tag: 1770626473-681557 X-HE-Meta: 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 mM2NknCh jH7+pmXJ8RCGwMVJfKXr4I7biPnI1w0eQ6vB+ZY+6T1J4Yax+/QekSmsXwxR06GQqHEd6+HfGBSNJk8tWfUKAAqwtfJLprsXkj9W218vcKl7LE7DPwdVjWbZ76JsV1I36OZwN4qnvJNvjiapoZv6yQL/j/69FvGFRfBvI28Geg57dhb1YfaHeWIP0fZCpyuLOh9GzdAaw4gJUn+GKAH3a5VjGkYj9L/H3CpTW98rhrQyAlvb3s+uarAKIDv6Vbagvb06DNpWEAXNw2+MPFKP5jNCLN8aQcZ9p/Fzk28eGmbORYprYmRI+6OR8834SeaTDnyJ9BRXZhkkU+M2MWCTrk+sCw057MOGIdnfQ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-02-07 11:36, Mike Rapoport wrote: >> Unfortunately, that does not help. The LDOM goes down in the same fashion. > > Apparently something is wrong with my pointer arithmetics :/ > > Can you try this one instead? > > diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h > index 74ede706fb32..615f460c50af 100644 > --- a/arch/sparc/include/asm/pgtable_64.h > +++ b/arch/sparc/include/asm/pgtable_64.h > @@ -210,6 +210,9 @@ extern unsigned long _PAGE_CACHE; > extern unsigned long pg_iobits; > extern unsigned long _PAGE_ALL_SZ_BITS; > > +extern struct page *mem_map_zero; > +#define ZERO_PAGE(vaddr) (mem_map_zero) > + > /* PFNs are real physical page numbers. However, mem_map only begins to record > * per-page information starting at pfn_base. This is to handle systems where > * the first physical page in the machine is at some huge physical address, > diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c > index 2bd99944176d..aa1f9f071fb2 100644 > --- a/arch/sparc/mm/init_64.c > +++ b/arch/sparc/mm/init_64.c > @@ -177,6 +177,9 @@ extern unsigned long sparc_ramdisk_image64; > extern unsigned int sparc_ramdisk_image; > extern unsigned int sparc_ramdisk_size; > > +struct page *mem_map_zero __read_mostly; > +EXPORT_SYMBOL(mem_map_zero); > + > unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly; > > unsigned long sparc64_kern_pri_context __read_mostly; > @@ -2495,6 +2498,9 @@ static void __init register_page_bootmem_info(void) > } > void __init mem_init(void) > { > + phys_addr_t zero_page_pa = kern_base + > + ((unsigned long)&empty_zero_page[0] - KERNBASE); > + > /* > * Must be done after boot memory is put on freelist, because here we > * might set fields in deferred struct pages that have not yet been > @@ -2503,6 +2509,12 @@ void __init mem_init(void) > */ > register_page_bootmem_info(); > > + /* > + * Set up the zero page, mark it reserved, so that page count > + * is not manipulated when freeing the page from user ptes. > + */ > + mem_map_zero = pfn_to_page(PHYS_PFN(zero_page_pa)); > + > if (tlb_type == cheetah || tlb_type == cheetah_plus) > cheetah_ecache_flush_init(); > } > With that one, things work fine. Cheers, Andreas