From patchwork Fri Sep 24 13:48:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 12515609 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 C6C44C433F5 for ; Fri, 24 Sep 2021 13:49:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 79A946105A for ; Fri, 24 Sep 2021 13:49:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 79A946105A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csgroup.eu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 1DB29900003; Fri, 24 Sep 2021 09:49:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 18AE4900002; Fri, 24 Sep 2021 09:49:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 07A41900003; Fri, 24 Sep 2021 09:49:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0137.hostedemail.com [216.40.44.137]) by kanga.kvack.org (Postfix) with ESMTP id EC5C6900002 for ; Fri, 24 Sep 2021 09:49:25 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id AC7778249980 for ; Fri, 24 Sep 2021 13:49:25 +0000 (UTC) X-FDA: 78622599090.04.6B8D58C Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) by imf14.hostedemail.com (Postfix) with ESMTP id 46D1D6001989 for ; Fri, 24 Sep 2021 13:49:25 +0000 (UTC) Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4HGD0Z2Ghmz9sVr; Fri, 24 Sep 2021 15:49:18 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Sr-aHIJnT2hD; Fri, 24 Sep 2021 15:49:18 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4HGD0X5JDkz9sVs; Fri, 24 Sep 2021 15:49:16 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 9AEDD8B77E; Fri, 24 Sep 2021 15:49:16 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id uoZyYyvOfIn5; Fri, 24 Sep 2021 15:49:16 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.202.215]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 5359E8B780; Fri, 24 Sep 2021 15:49:16 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (localhost [127.0.0.1]) by PO20335.IDSI0.si.c-s.fr (8.16.1/8.16.1) with ESMTPS id 18ODn5pO1293056 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 24 Sep 2021 15:49:05 +0200 Received: (from chleroy@localhost) by PO20335.IDSI0.si.c-s.fr (8.16.1/8.16.1/Submit) id 18ODn4Zl1293054; Fri, 24 Sep 2021 15:49:04 +0200 X-Authentication-Warning: PO20335.IDSI0.si.c-s.fr: chleroy set sender to christophe.leroy@csgroup.eu using -f From: Christophe Leroy To: Andrew Morton , arnd@arndb.de Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org, Gerald Schaefer Subject: [PATCH 1/3] mm: Make generic arch_is_kernel_initmem_freed() do what it says Date: Fri, 24 Sep 2021 15:48:45 +0200 Message-Id: <0b55650058a5bf64f7d74781871a1ada2298c8b4.1632491308.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Authentication-Results: imf14.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf14.hostedemail.com: domain of christophe.leroy@csgroup.eu designates 93.17.235.10 as permitted sender) smtp.mailfrom=christophe.leroy@csgroup.eu X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 46D1D6001989 X-Stat-Signature: mxnhfuqpd5knsgc5bbxzm7ohoinmero8 X-HE-Tag: 1632491365-23366 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: Commit 7a5da02de8d6 ("locking/lockdep: check for freed initmem in static_obj()") added arch_is_kernel_initmem_freed() which is supposed to report whether an object is part of already freed init memory. For the time being, the generic version of arch_is_kernel_initmem_freed() always reports 'false', allthough free_initmem() is generically called on all architectures. Therefore, change the generic version of arch_is_kernel_initmem_freed() to check whether free_initmem() has been called. If so, then check if a given address falls into init memory. In order to use function init_section_contains(), the fonction is moved at the end of asm-generic/section.h Cc: Gerald Schaefer Signed-off-by: Christophe Leroy --- include/asm-generic/sections.h | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index d16302d3eb59..d1e5bb2c6b72 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -80,20 +80,6 @@ static inline int arch_is_kernel_data(unsigned long addr) } #endif -/* - * Check if an address is part of freed initmem. This is needed on architectures - * with virt == phys kernel mapping, for code that wants to check if an address - * is part of a static object within [_stext, _end]. After initmem is freed, - * memory can be allocated from it, and such allocations would then have - * addresses within the range [_stext, _end]. - */ -#ifndef arch_is_kernel_initmem_freed -static inline int arch_is_kernel_initmem_freed(unsigned long addr) -{ - return 0; -} -#endif - /** * memory_contains - checks if an object is contained within a memory region * @begin: virtual address of the beginning of the memory region @@ -172,4 +158,21 @@ static inline bool is_kernel_rodata(unsigned long addr) addr < (unsigned long)__end_rodata; } +/* + * Check if an address is part of freed initmem. This is needed on architectures + * with virt == phys kernel mapping, for code that wants to check if an address + * is part of a static object within [_stext, _end]. After initmem is freed, + * memory can be allocated from it, and such allocations would then have + * addresses within the range [_stext, _end]. + */ +#ifndef arch_is_kernel_initmem_freed +static inline int arch_is_kernel_initmem_freed(unsigned long addr) +{ + if (system_state < SYSTEM_RUNNING) + return 0; + + return init_section_contains((void *)addr, 1); +} +#endif + #endif /* _ASM_GENERIC_SECTIONS_H_ */