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=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 64725C4CEC7 for ; Fri, 13 Sep 2019 07:11:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3141F208C2 for ; Fri, 13 Sep 2019 07:11:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="UJ7cXfv+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727856AbfIMHLz (ORCPT ); Fri, 13 Sep 2019 03:11:55 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:59411 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726164AbfIMHLz (ORCPT ); Fri, 13 Sep 2019 03:11:55 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 46V6JR5Tvtz9tx5P; Fri, 13 Sep 2019 09:11:51 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=UJ7cXfv+; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id bnDgViFqh-wM; Fri, 13 Sep 2019 09:11:51 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 46V6JR2lDWz9tx4q; Fri, 13 Sep 2019 09:11:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1568358711; bh=SKMq9rsjiToR1XeaTtZaZt/ZVEVZP1tQeQ1xFEfo9qg=; h=Subject:From:To:Cc:References:Date:In-Reply-To:From; b=UJ7cXfv+eBfnhyPf3nZi2bp8LPd3ec5emLPKdnxbi++UttiefE18hXhlgFdX8hS4M Qb+y4OdLyxrGYBNBbE0rg59w7Fq7U4kvfShMqiAfaExqQhGKEoc8XoASSbxk/5LWUJ AnnZQSsx92tpe/Y9wcUDVAMlSabwRdE/QheT7Q2I= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 503638B966; Fri, 13 Sep 2019 09:11:52 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id erem9Jv6ULxz; Fri, 13 Sep 2019 09:11:52 +0200 (CEST) Received: from [172.25.230.101] (po15451.idsi0.si.c-s.fr [172.25.230.101]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 912508B958; Fri, 13 Sep 2019 09:11:51 +0200 (CEST) Subject: Re: [PATCH] mm/pgtable/debug: Fix test validating architecture page table helpers From: Christophe Leroy To: Anshuman Khandual , linux-mm@kvack.org Cc: Mark Rutland , linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Peter Zijlstra , James Hogan , Heiko Carstens , Michal Hocko , Dave Hansen , Paul Mackerras , sparclinux@vger.kernel.org, Dan Williams , linux-s390@vger.kernel.org, Jason Gunthorpe , x86@kernel.org, Russell King - ARM Linux , Matthew Wilcox , Steven Price , Tetsuo Handa , Vlastimil Babka , linux-snps-arc@lists.infradead.org, Kees Cook , Mark Brown , "Kirill A . Shutemov" , Thomas Gleixner , Gerald Schaefer , linux-arm-kernel@lists.infradead.org, Sri Krishna chowdary , Masahiro Yamada , Greg Kroah-Hartman , Ard Biesheuvel , linux-mips@vger.kernel.org, Ralf Baechle , linux-kernel@vger.kernel.org, Paul Burton , Mike Rapoport , Vineet Gupta , Martin Schwidefsky , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" References: <1892b37d1fd9a4ed39e76c4b999b6556077201c0.1568355752.git.christophe.leroy@c-s.fr> <527dd29d-45fa-4d83-1899-6cbf268dd749@arm.com> Message-ID: Date: Fri, 13 Sep 2019 09:11:49 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Le 13/09/2019 à 09:03, Christophe Leroy a écrit : > > > Le 13/09/2019 à 08:58, Anshuman Khandual a écrit : >> On 09/13/2019 11:53 AM, Christophe Leroy wrote: >>> Fix build failure on powerpc. >>> >>> Fix preemption imbalance. >>> >>> Signed-off-by: Christophe Leroy >>> --- >>>   mm/arch_pgtable_test.c | 3 +++ >>>   1 file changed, 3 insertions(+) >>> >>> diff --git a/mm/arch_pgtable_test.c b/mm/arch_pgtable_test.c >>> index 8b4a92756ad8..f2b3c9ec35fa 100644 >>> --- a/mm/arch_pgtable_test.c >>> +++ b/mm/arch_pgtable_test.c >>> @@ -24,6 +24,7 @@ >>>   #include >>>   #include >>>   #include >>> +#include >> >> This is okay. >> >>>   #include >>>   #include >>> @@ -400,6 +401,8 @@ static int __init arch_pgtable_tests_init(void) >>>       p4d_clear_tests(p4dp); >>>       pgd_clear_tests(mm, pgdp); >>> +    pte_unmap(ptep); >>> + >> >> Now the preemption imbalance via pte_alloc_map() path i.e >> >> pte_alloc_map() -> pte_offset_map() -> kmap_atomic() >> >> Is not this very much powerpc 32 specific or this will be applicable >> for all platform which uses kmap_XXX() to map high memory ? >> > > See > https://elixir.bootlin.com/linux/v5.3-rc8/source/include/linux/highmem.h#L91 > > > I think it applies at least to all arches using the generic implementation. > > Applies also to arm: > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/arm/mm/highmem.c#L52 > > Applies also to mips: > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/mips/mm/highmem.c#L47 > > Same on sparc: > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/sparc/mm/highmem.c#L52 > > > Same on x86: > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/x86/mm/highmem_32.c#L34 > > > I have not checked others, but I guess it is like that for all. > Seems like I answered too quickly. All kmap_atomic() do preempt_disable(), but not all pte_alloc_map() call kmap_atomic(). However, for instance ARM does: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/arm/include/asm/pgtable.h#L200 And X86 as well: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/x86/include/asm/pgtable_32.h#L51 Microblaze also: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/microblaze/include/asm/pgtable.h#L495 Christophe