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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 6BCE5C07E99 for ; Fri, 9 Jul 2021 13:20:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 508F2608FE for ; Fri, 9 Jul 2021 13:20:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232462AbhGINXi (ORCPT ); Fri, 9 Jul 2021 09:23:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:54594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232191AbhGINXh (ORCPT ); Fri, 9 Jul 2021 09:23:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 82C7D608FE; Fri, 9 Jul 2021 13:20:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1625836853; bh=OsAW912EnxIIBeMknGEAHaC5qLWswKGKvuAOu/zl5gA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FzbPIh90qpgsSboGfmaQKZUUDDwPOfPYC+zfGiU5mmi0EdB1ci65CzPcz4/WInSrU HqY86F6VNZ5DKvDfbhraoRMHaclPN8rHJ/NhYQcHQBdBmhIMizxwr514BUpLIa3Xdq gMglKxpQQgenFyFHR61L9WQqzgwZcRXR/mpnlzO4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alex Shi , Michal Hocko , Hugh Dickins , Johannes Weiner , Vladimir Davydov , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 4.19 01/34] mm: add VM_WARN_ON_ONCE_PAGE() macro Date: Fri, 9 Jul 2021 15:20:17 +0200 Message-Id: <20210709131645.971246591@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210709131644.969303901@linuxfoundation.org> References: <20210709131644.969303901@linuxfoundation.org> User-Agent: quilt/0.66 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alex Shi [ Upstream commit a4055888629bc0467d12d912cd7c90acdf3d9b12 part ] Add VM_WARN_ON_ONCE_PAGE() macro. Link: https://lkml.kernel.org/r/1604283436-18880-3-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi Acked-by: Michal Hocko Acked-by: Hugh Dickins Acked-by: Johannes Weiner Cc: Vladimir Davydov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Note on stable backport: original commit was titled mm/memcg: warning on !memcg after readahead page charged which included uses of this macro in mm/memcontrol.c: here omitted. Signed-off-by: Hugh Dickins Signed-off-by: Sasha Levin --- include/linux/mmdebug.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h index 2ad72d2c8cc5..5d0767cb424a 100644 --- a/include/linux/mmdebug.h +++ b/include/linux/mmdebug.h @@ -37,6 +37,18 @@ void dump_mm(const struct mm_struct *mm); BUG(); \ } \ } while (0) +#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \ + static bool __section(".data.once") __warned; \ + int __ret_warn_once = !!(cond); \ + \ + if (unlikely(__ret_warn_once && !__warned)) { \ + dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\ + __warned = true; \ + WARN_ON(1); \ + } \ + unlikely(__ret_warn_once); \ +}) + #define VM_WARN_ON(cond) (void)WARN_ON(cond) #define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond) #define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format) @@ -48,6 +60,7 @@ void dump_mm(const struct mm_struct *mm); #define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond) #define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond) #define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond) +#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond) #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond) #define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond) #endif -- 2.30.2