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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 16404C433E7 for ; Fri, 16 Oct 2020 02:42:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C8F3E2087D for ; Fri, 16 Oct 2020 02:42:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816129; bh=WsZ/Pvy+vzQ8OUmiTbnTEFLx2Jt1xYUpKp1KXGw8OGw=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=lp1iXXFKviSXMvt4e8LNuoR1kIhfdjLv1afaAD6mGirseETXjkNVuSE7p2u9wLFQY ZzAFUBSclzbwdLC55rmBBT7qdWmRxboOQKB9BpiflxVJ/pvz8B4gV4Ru1ZGJW8i/II o+PRXODGxlRE2G0u8xRkgdBud7lOiyxMl8976iuc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731913AbgJPCmJ (ORCPT ); Thu, 15 Oct 2020 22:42:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:57594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728688AbgJPCmJ (ORCPT ); Thu, 15 Oct 2020 22:42:09 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (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 3D65C20897; Fri, 16 Oct 2020 02:42:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816127; bh=WsZ/Pvy+vzQ8OUmiTbnTEFLx2Jt1xYUpKp1KXGw8OGw=; h=Date:From:To:Subject:In-Reply-To:From; b=GXyyMNlseRmy8zaVxKtwp+KhrTW7ZUh/nAjj/YYuecLpvGF/5oUTVx82iEnUSsjXn uSZxA9SKNPMivvKlx/ykGjTSJF3GlaGgQ5EjwIiq5Jphl42nmrQUzbk+jf+prYV+UK ueb2kAfStZ5uHJBdkAT4rwhkjqeFTjL2Nbzfzg9g= Date: Thu, 15 Oct 2020 19:42:06 -0700 From: Andrew Morton To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, willy@infradead.org, ying.huang@intel.com Subject: [patch 020/156] mm/memory: remove page fault assumption of compound page size Message-ID: <20201016024206.NjQzcrMM8%akpm@linux-foundation.org> In-Reply-To: <20201015192732.f448da14e9854c7cb7299956@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "Matthew Wilcox (Oracle)" Subject: mm/memory: remove page fault assumption of compound page size A compound page in the page cache will not necessarily be of PMD size, so check explicitly. [willy@infradead.org: fix remove page fault assumption of compound page size] Link: https://lkml.kernel.org/r/20201001152259.14932-1-willy@infradead.org Link: https://lkml.kernel.org/r/20200908195539.25896-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: Huang Ying Cc: Kirill A. Shutemov Signed-off-by: Andrew Morton --- mm/memory.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/mm/memory.c~mm-memory-remove-page-fault-assumption-of-compound-page-size +++ a/mm/memory.c @@ -3709,13 +3709,14 @@ static vm_fault_t do_set_pmd(struct vm_f unsigned long haddr = vmf->address & HPAGE_PMD_MASK; pmd_t entry; int i; - vm_fault_t ret; + vm_fault_t ret = VM_FAULT_FALLBACK; if (!transhuge_vma_suitable(vma, haddr)) - return VM_FAULT_FALLBACK; + return ret; - ret = VM_FAULT_FALLBACK; page = compound_head(page); + if (compound_order(page) != HPAGE_PMD_ORDER) + return ret; /* * Archs like ppc64 need additonal space to store information _