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=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 6C222C433E0 for ; Wed, 13 Jan 2021 07:02:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B699A23125 for ; Wed, 13 Jan 2021 07:02:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B699A23125 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A38C08D0017; Wed, 13 Jan 2021 02:02:20 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9E6C88D0007; Wed, 13 Jan 2021 02:02:20 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 922C58D0017; Wed, 13 Jan 2021 02:02:20 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0196.hostedemail.com [216.40.44.196]) by kanga.kvack.org (Postfix) with ESMTP id 7A3928D0007 for ; Wed, 13 Jan 2021 02:02:20 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 476933629 for ; Wed, 13 Jan 2021 07:02:20 +0000 (UTC) X-FDA: 77699858040.16.stem80_160163f2751c Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin16.hostedemail.com (Postfix) with ESMTP id 2946F100E690B for ; Wed, 13 Jan 2021 07:02:20 +0000 (UTC) X-HE-Tag: stem80_160163f2751c X-Filterd-Recvd-Size: 4721 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Wed, 13 Jan 2021 07:02:19 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DD715101E; Tue, 12 Jan 2021 23:02:18 -0800 (PST) Received: from [10.163.88.174] (unknown [10.163.88.174]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 41C083F70D; Tue, 12 Jan 2021 23:02:14 -0800 (PST) Subject: Re: [PATCH V2 3/3] s390/mm: Define arch_get_mappable_range() To: David Hildenbrand , linux-mm@kvack.org, akpm@linux-foundation.org, hca@linux.ibm.com, catalin.marinas@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Vasily Gorbik , Will Deacon , Ard Biesheuvel , Mark Rutland References: <1608218912-28932-1-git-send-email-anshuman.khandual@arm.com> <1608218912-28932-4-git-send-email-anshuman.khandual@arm.com> <87ae0b7c-0e95-6068-900e-d813a53f2732@redhat.com> From: Anshuman Khandual Message-ID: <1efac09f-3eea-51fd-7754-98659a5e0054@arm.com> Date: Wed, 13 Jan 2021 12:32:34 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <87ae0b7c-0e95-6068-900e-d813a53f2732@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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: On 1/11/21 4:10 PM, David Hildenbrand wrote: > On 17.12.20 16:28, Anshuman Khandual wrote: >> This overrides arch_get_mappabble_range() on s390 platform which will be >> used with recently added generic framework. It modifies the existing range >> check in vmem_add_mapping() using arch_get_mappable_range(). It also adds a >> VM_BUG_ON() check that would ensure that memhp_range_allowed() has already >> been called on the hotplug path. >> >> Cc: Heiko Carstens >> Cc: Vasily Gorbik >> Cc: David Hildenbrand >> Cc: linux-s390@vger.kernel.org >> Cc: linux-kernel@vger.kernel.org >> Acked-by: Heiko Carstens >> Signed-off-by: Anshuman Khandual >> --- >> arch/s390/mm/init.c | 1 + >> arch/s390/mm/vmem.c | 15 ++++++++++++++- >> 2 files changed, 15 insertions(+), 1 deletion(-) >> >> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c >> index 77767850d0d0..e0e78234ae57 100644 >> --- a/arch/s390/mm/init.c >> +++ b/arch/s390/mm/init.c >> @@ -291,6 +291,7 @@ int arch_add_memory(int nid, u64 start, u64 size, >> if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) >> return -EINVAL; >> >> + VM_BUG_ON(!memhp_range_allowed(start, size, 1)); > > s/1/true/ Sure, will do. > >> rc = vmem_add_mapping(start, size); >> if (rc) >> return rc; >> diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c >> index b239f2ba93b0..e10e563ad2b4 100644 >> --- a/arch/s390/mm/vmem.c >> +++ b/arch/s390/mm/vmem.c >> @@ -4,6 +4,7 @@ >> * Author(s): Heiko Carstens >> */ >> >> +#include >> #include >> #include >> #include >> @@ -532,11 +533,23 @@ void vmem_remove_mapping(unsigned long start, unsigned long size) >> mutex_unlock(&vmem_mutex); >> } >> >> +struct range arch_get_mappable_range(void) >> +{ >> + struct range memhp_range; >> + >> + memhp_range.start = 0; >> + memhp_range.end = VMEM_MAX_PHYS; > > s/ / / > > IIRC, the range is inclusive? "VMEM_MAX_PHYS - 1" then, and adjust the > check below. Right, the memory range is inclusive at both ends. Hence will update the code here. diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 21cabe3473d7..afc39ff1cc8d 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -538,7 +538,7 @@ struct range arch_get_mappable_range(void) struct range memhp_range; memhp_range.start = 0; - memhp_range.end = VMEM_MAX_PHYS; + memhp_range.end = VMEM_MAX_PHYS - 1; return memhp_range; } @@ -549,7 +549,7 @@ int vmem_add_mapping(unsigned long start, unsigned long size) range = arch_get_mappable_range(); if (start < range.start || - start + size > range.end || + start + size > range.end + 1 || start + size < start) return -ERANGE; (start + size - 1) is valid only when it is upto the inclusive range.end value.