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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 D6DBFC4CEC9 for ; Tue, 17 Sep 2019 08:23:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9238320678 for ; Tue, 17 Sep 2019 08:23:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9238320678 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 190E56B0003; Tue, 17 Sep 2019 04:23:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 169826B0005; Tue, 17 Sep 2019 04:23:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 02FD26B0006; Tue, 17 Sep 2019 04:23:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0167.hostedemail.com [216.40.44.167]) by kanga.kvack.org (Postfix) with ESMTP id D6C6C6B0003 for ; Tue, 17 Sep 2019 04:23:15 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 905F1824CA39 for ; Tue, 17 Sep 2019 08:23:15 +0000 (UTC) X-FDA: 75943722750.19.test66_5692a4b1d1f20 X-HE-Tag: test66_5692a4b1d1f20 X-Filterd-Recvd-Size: 8447 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Tue, 17 Sep 2019 08:23:14 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 2049BAE84; Tue, 17 Sep 2019 08:23:12 +0000 (UTC) Subject: Re: [PATCH v3] mm/kasan: dump alloc and free stack for page allocator To: Andrey Ryabinin , Walter Wu Cc: Qian Cai , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrew Morton , Martin Schwidefsky , Andrey Konovalov , Arnd Bergmann , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com References: <20190911083921.4158-1-walter-zh.wu@mediatek.com> <5E358F4B-552C-4542-9655-E01C7B754F14@lca.pw> <1568297308.19040.5.camel@mtksdccf07> <613f9f23-c7f0-871f-fe13-930c35ef3105@suse.cz> <79fede05-735b-8477-c273-f34db93fd72b@virtuozzo.com> <6d58ce86-b2a4-40af-bf40-c604b457d086@suse.cz> <4e76e7ce-1d61-524a-622b-663c01d19707@virtuozzo.com> From: Vlastimil Babka Openpgp: 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owner-majordomo@kvack.org List-ID: On 9/16/19 5:57 PM, Andrey Ryabinin wrote: >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -710,8 +710,12 @@ static int __init early_debug_pagealloc(char *buf) >> if (kstrtobool(buf, &enable)) >> return -EINVAL; >> >> - if (enable) >> + if (enable) { >> static_branch_enable(&_debug_pagealloc_enabled); >> +#ifdef CONFIG_PAGE_OWNER >> + page_owner_free_stack_disabled = false; > > I think this won't work with CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y Good point, thanks. >> +#endif >> + } >> >> return 0; >> } >> diff --git a/mm/page_owner.c b/mm/page_owner.c >> index dee931184788..b589bfbc4795 100644 >> --- a/mm/page_owner.c >> +++ b/mm/page_owner.c >> @@ -24,13 +24,15 @@ struct page_owner { >> short last_migrate_reason; >> gfp_t gfp_mask; >> depot_stack_handle_t handle; >> -#ifdef CONFIG_DEBUG_PAGEALLOC >> +#ifdef CONFIG_PAGE_OWNER_FREE_STACK >> depot_stack_handle_t free_handle; >> #endif >> }; >> >> static bool page_owner_disabled = true; >> +bool page_owner_free_stack_disabled = true; >> DEFINE_STATIC_KEY_FALSE(page_owner_inited); >> +static DEFINE_STATIC_KEY_FALSE(page_owner_free_stack); >> >> static depot_stack_handle_t dummy_handle; >> static depot_stack_handle_t failure_handle; >> @@ -46,6 +48,9 @@ static int __init early_page_owner_param(char *buf) >> if (strcmp(buf, "on") == 0) >> page_owner_disabled = false; >> >> + if (!page_owner_disabled && IS_ENABLED(CONFIG_KASAN)) > > I'd rather keep all logic in one place, i.e. "if (!page_owner_disabled && (IS_ENABLED(CONFIG_KASAN) || debug_pagealloc_enabled())" > With this no changes in early_debug_pagealloc() required and CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y should also work correctly. In this function it would not work if the debug_pagealloc param gets processed later than page_owner, but should be doable in init_page_owner(), I'll try, thanks. > >> + page_owner_free_stack_disabled = false; >> + >> return 0; >> } >> early_param("page_owner", early_page_owner_param); > >