From patchwork Tue Jun 23 19:51:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 223052 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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, 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 A032BC433E0 for ; Tue, 23 Jun 2020 21:42:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C7442078E for ; Tue, 23 Jun 2020 21:42:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592948579; bh=ft4SnJwcqPOlJpRwqsAwojz+qCuyHdM9F/BLQDkeFUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bThN7gbm/lDVK4mwrSTNx28Cq+2Zcy4XUibwXhXZteINBQiWcbLX8k3Zyd5ZWE/ZD YS9lfuoAmxiBVv5sW5z3Vgckc5fnxqS8k7dHQmtJYvqmplFet4o7AFt9soyyOIUQPR 39117E3cyBqorBFdmzE7GEGflPB25PqdMQnr89+s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388110AbgFWVm6 (ORCPT ); Tue, 23 Jun 2020 17:42:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:42696 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388180AbgFWUES (ORCPT ); Tue, 23 Jun 2020 16:04:18 -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 4151020EDD; Tue, 23 Jun 2020 20:04:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592942657; bh=ft4SnJwcqPOlJpRwqsAwojz+qCuyHdM9F/BLQDkeFUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PlyonCtY7msQYiP1TR9Y/PzW7Xvl/HsTfpRMDMQ8nrwbI9sWqoXK/14rgjfo45t/8 eevnldV/DlgRZrnk60heGzQJAnW16HrruDz7atXGsQOiwmuQ5oYt4Fr6JNRpOJe8Kb Igtb9ki6EQ43L8XuzvD0Db/whBU9rLYUt9ZdrxRU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pingfan Liu , Hari Bathini , Michael Ellerman , Sasha Levin Subject: [PATCH 5.7 085/477] powerpc/crashkernel: Take "mem=" option into account Date: Tue, 23 Jun 2020 21:51:22 +0200 Message-Id: <20200623195411.627554669@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200623195407.572062007@linuxfoundation.org> References: <20200623195407.572062007@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pingfan Liu [ Upstream commit be5470e0c285a68dc3afdea965032f5ddc8269d7 ] 'mem=" option is an easy way to put high pressure on memory during some test. Hence after applying the memory limit, instead of total mem, the actual usable memory should be considered when reserving mem for crashkernel. Otherwise the boot up may experience OOM issue. E.g. it would reserve 4G prior to the change and 512M afterward, if passing crashkernel="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G", and mem=5G on a 256G machine. This issue is powerpc specific because it puts higher priority on fadump and kdump reservation than on "mem=". Referring the following code: if (fadump_reserve_mem() == 0) reserve_crashkernel(); ... /* Ensure that total memory size is page-aligned. */ limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); memblock_enforce_memory_limit(limit); While on other arches, the effect of "mem=" takes a higher priority and pass through memblock_phys_mem_size() before calling reserve_crashkernel(). Signed-off-by: Pingfan Liu Reviewed-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1585749644-4148-1-git-send-email-kernelfans@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kexec/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c index 078fe3d76feb6..56da5eb2b923a 100644 --- a/arch/powerpc/kexec/core.c +++ b/arch/powerpc/kexec/core.c @@ -115,11 +115,12 @@ void machine_kexec(struct kimage *image) void __init reserve_crashkernel(void) { - unsigned long long crash_size, crash_base; + unsigned long long crash_size, crash_base, total_mem_sz; int ret; + total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size(); /* use common parsing */ - ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + ret = parse_crashkernel(boot_command_line, total_mem_sz, &crash_size, &crash_base); if (ret == 0 && crash_size > 0) { crashk_res.start = crash_base; @@ -178,6 +179,7 @@ void __init reserve_crashkernel(void) /* Crash kernel trumps memory limit */ if (memory_limit && memory_limit <= crashk_res.end) { memory_limit = crashk_res.end + 1; + total_mem_sz = memory_limit; printk("Adjusted memory limit for crashkernel, now 0x%llx\n", memory_limit); } @@ -186,7 +188,7 @@ void __init reserve_crashkernel(void) "for crashkernel (System RAM: %ldMB)\n", (unsigned long)(crash_size >> 20), (unsigned long)(crashk_res.start >> 20), - (unsigned long)(memblock_phys_mem_size() >> 20)); + (unsigned long)(total_mem_sz >> 20)); if (!memblock_is_region_memory(crashk_res.start, crash_size) || memblock_reserve(crashk_res.start, crash_size)) {