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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 DC5C8C433F5 for ; Tue, 4 Sep 2018 19:25:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85A942075E for ; Tue, 4 Sep 2018 19:25:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 85A942075E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727873AbeIDXwU (ORCPT ); Tue, 4 Sep 2018 19:52:20 -0400 Received: from mga11.intel.com ([192.55.52.93]:49419 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727586AbeIDXwU (ORCPT ); Tue, 4 Sep 2018 19:52:20 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Sep 2018 12:25:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,330,1531810800"; d="scan'208";a="230173938" Received: from ray.jf.intel.com (HELO [10.54.74.179]) ([10.54.74.179]) by orsmga004.jf.intel.com with ESMTP; 04 Sep 2018 12:25:49 -0700 Subject: Re: [PATCH 1/2] mm: Move page struct poisoning from CONFIG_DEBUG_VM to CONFIG_DEBUG_VM_PGFLAGS To: Alexander Duyck , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20180904181550.4416.50701.stgit@localhost.localdomain> <20180904183339.4416.44582.stgit@localhost.localdomain> Cc: alexander.h.duyck@intel.com, pavel.tatashin@microsoft.com, mhocko@suse.com, akpm@linux-foundation.org, mingo@kernel.org, kirill.shutemov@linux.intel.com From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180904183339.4416.44582.stgit@localhost.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/04/2018 11:33 AM, Alexander Duyck wrote: > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -1444,7 +1444,7 @@ void * __init memblock_virt_alloc_try_nid_raw( > > ptr = memblock_virt_alloc_internal(size, align, > min_addr, max_addr, nid); > -#ifdef CONFIG_DEBUG_VM > +#ifdef CONFIG_DEBUG_VM_PGFLAGS > if (ptr && size > 0) > memset(ptr, PAGE_POISON_PATTERN, size); > #endif > diff --git a/mm/sparse.c b/mm/sparse.c > index 10b07eea9a6e..0fd9ad5021b0 100644 > --- a/mm/sparse.c > +++ b/mm/sparse.c > @@ -696,7 +696,7 @@ int __meminit sparse_add_one_section(struct pglist_data *pgdat, > goto out; > } > > -#ifdef CONFIG_DEBUG_VM > +#ifdef CONFIG_DEBUG_VM_PGFLAGS > /* > * Poison uninitialized struct pages in order to catch invalid flags > * combinations. I think this is the wrong way to do this. It keeps the setting and checking still rather tenuously connected. If you were to leave it this way, it needs commenting. It's also rather odd that we're memsetting the entire 'struct page' for a config option that's supposedly dealing with page->flags. That deserves _some_ addressing in a comment or changelog. How about: #ifdef CONFIG_DEBUG_VM_PGFLAGS #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page) +static inline void poison_struct_pages(struct page *pages, int nr) +{ + memset(pages, PAGE_POISON_PATTERN, size * sizeof(...)); +} #else #define VM_BUG_ON_PGFLAGS(cond, page) BUILD_BUG_ON_INVALID(cond) static inline void poison_struct_pages(struct page *pages, int nr) {} #endif That puts the setting and checking in one spot, and also removes a couple of #ifdefs from .c files.