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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 5E772C2D0FA for ; Wed, 13 May 2020 09:55:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D436205ED for ; Wed, 13 May 2020 09:55:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589363705; bh=xz5Gg2isLL+FnA6oJVp9NAbGaQF3iERV+FstlcUn034=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xAOUrJgxye8GU/fQJ/Zb0QHl8COyofNXxW1rgXVnx9GA1qBeL4Rxds/oHGh7Qg+8o HC4hLjqS4KyFj6V8Ugq4HF92Tc2tdS17ki644ONuc/BYN7U7ypqvrwxEe1XYM273s+ k2//nI4SsYZ7Urt77ybGYd/em4nTz6elKyb5Nn3Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388208AbgEMJzE (ORCPT ); Wed, 13 May 2020 05:55:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:57754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388195AbgEMJzB (ORCPT ); Wed, 13 May 2020 05:55:01 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 E6CFD2176D; Wed, 13 May 2020 09:54:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589363700; bh=xz5Gg2isLL+FnA6oJVp9NAbGaQF3iERV+FstlcUn034=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zc2pfBKaw19sQnT72RNayXbH99sKwfZkJRSE5+A3ULa98IA17exAhFRSY3AR/87Ry Mgm3NpsV/kkLDvWY/VXQFVhDKYKEY3a1yG0k/jvKs6V1dVeWfQ2btddG/jug87LULE HEuWaLoc2Ocfrjf2g4ze1CLYS9bmji4inVvyQTXQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vincent Chen , Anup Patel , Yash Shah , Palmer Dabbelt Subject: [PATCH 5.6 090/118] riscv: set max_pfn to the PFN of the last page Date: Wed, 13 May 2020 11:45:09 +0200 Message-Id: <20200513094425.220798099@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200513094417.618129545@linuxfoundation.org> References: <20200513094417.618129545@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vincent Chen commit c749bb2d554825e007cbc43b791f54e124dadfce upstream. The current max_pfn equals to zero. In this case, I found it caused users cannot get some page information through /proc such as kpagecount in v5.6 kernel because of new sanity checks. The following message is displayed by stress-ng test suite with the command "stress-ng --verbose --physpage 1 -t 1" on HiFive unleashed board. # stress-ng --verbose --physpage 1 -t 1 stress-ng: debug: [109] 4 processors online, 4 processors configured stress-ng: info: [109] dispatching hogs: 1 physpage stress-ng: debug: [109] cache allocate: reducing cache level from L3 (too high) to L0 stress-ng: debug: [109] get_cpu_cache: invalid cache_level: 0 stress-ng: info: [109] cache allocate: using built-in defaults as no suitable cache found stress-ng: debug: [109] cache allocate: default cache size: 2048K stress-ng: debug: [109] starting stressors stress-ng: debug: [109] 1 stressor spawned stress-ng: debug: [110] stress-ng-physpage: started [110] (instance 0) stress-ng: error: [110] stress-ng-physpage: cannot read page count for address 0x3fd34de000 in /proc/kpagecount, errno=0 (Success) stress-ng: error: [110] stress-ng-physpage: cannot read page count for address 0x3fd32db078 in /proc/kpagecount, errno=0 (Success) ... stress-ng: error: [110] stress-ng-physpage: cannot read page count for address 0x3fd32db078 in /proc/kpagecount, errno=0 (Success) stress-ng: debug: [110] stress-ng-physpage: exited [110] (instance 0) stress-ng: debug: [109] process [110] terminated stress-ng: info: [109] successful run completed in 1.00s # After applying this patch, the kernel can pass the test. # stress-ng --verbose --physpage 1 -t 1 stress-ng: debug: [104] 4 processors online, 4 processors configured stress-ng: info: [104] dispatching hogs: 1 physpage stress-ng: info: [104] cache allocate: using defaults, can't determine cache details from sysfs stress-ng: debug: [104] cache allocate: default cache size: 2048K stress-ng: debug: [104] starting stressors stress-ng: debug: [104] 1 stressor spawned stress-ng: debug: [105] stress-ng-physpage: started [105] (instance 0) stress-ng: debug: [105] stress-ng-physpage: exited [105] (instance 0) stress-ng: debug: [104] process [105] terminated stress-ng: info: [104] successful run completed in 1.01s # Cc: stable@vger.kernel.org Signed-off-by: Vincent Chen Reviewed-by: Anup Patel Reviewed-by: Yash Shah Tested-by: Yash Shah Signed-off-by: Palmer Dabbelt Signed-off-by: Greg Kroah-Hartman --- arch/riscv/mm/init.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -149,7 +149,8 @@ void __init setup_bootmem(void) memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); set_max_mapnr(PFN_DOWN(mem_size)); - max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); + max_pfn = PFN_DOWN(memblock_end_of_DRAM()); + max_low_pfn = max_pfn; #ifdef CONFIG_BLK_DEV_INITRD setup_initrd();