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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 518F8C43381 for ; Wed, 27 Mar 2019 12:28:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A6CF2087C for ; Wed, 27 Mar 2019 12:28:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728778AbfC0M17 (ORCPT ); Wed, 27 Mar 2019 08:27:59 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:53812 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726233AbfC0M17 (ORCPT ); Wed, 27 Mar 2019 08:27:59 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EA5C6374; Wed, 27 Mar 2019 05:27:58 -0700 (PDT) Received: from p8cg001049571a15.blr.arm.com (p8cg001049571a15.blr.arm.com [10.162.40.146]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 5FD3C3F557; Wed, 27 Mar 2019 05:27:56 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, hannes@cmpxchg.org, david@redhat.com, vbabka@suse.cz, mhocko@suse.com, willy@infradead.org, akpm@linux-foundation.org Subject: [PATCH] mm/page-flags: Check enforce parameter in PF_ONLY_HEAD() Date: Wed, 27 Mar 2019 17:57:52 +0530 Message-Id: <1553689672-28343-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Just check for enforce parameter in PF_ONLY_HEAD() wrapper before calling VM_BUG_ON_PGFLAGS() for tail pages. Fixes: 62906027091f ("mm: add PageWaiters indicating tasks are waiting for a page bit") Signed-off-by: Anshuman Khandual --- include/linux/page-flags.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 9f8712a4b1a5..82539e287bc6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -229,7 +229,7 @@ static inline void page_init_poison(struct page *page, size_t size) #define PF_ANY(page, enforce) PF_POISONED_CHECK(page) #define PF_HEAD(page, enforce) PF_POISONED_CHECK(compound_head(page)) #define PF_ONLY_HEAD(page, enforce) ({ \ - VM_BUG_ON_PGFLAGS(PageTail(page), page); \ + VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \ PF_POISONED_CHECK(page); }) #define PF_NO_TAIL(page, enforce) ({ \ VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \ -- 2.20.1