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=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 7D26FC43603 for ; Tue, 10 Dec 2019 06:40:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3529520652 for ; Tue, 10 Dec 2019 06:40:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="Ae6vJj2Y" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3529520652 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D645D6B2AEB; Tue, 10 Dec 2019 01:40:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D14CA6B2AEC; Tue, 10 Dec 2019 01:40:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C2BB76B2AED; Tue, 10 Dec 2019 01:40:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0236.hostedemail.com [216.40.44.236]) by kanga.kvack.org (Postfix) with ESMTP id AE42E6B2AEB for ; Tue, 10 Dec 2019 01:40:13 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 5F6CA180AD81F for ; Tue, 10 Dec 2019 06:40:13 +0000 (UTC) X-FDA: 76248282306.15.taste04_1e159eb14d12 X-HE-Tag: taste04_1e159eb14d12 X-Filterd-Recvd-Size: 5908 Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Tue, 10 Dec 2019 06:40:12 +0000 (UTC) Received: from localhost (mailhub1-ext [192.168.12.233]) by localhost (Postfix) with ESMTP id 47X9RG3vN1z9vBn0; Tue, 10 Dec 2019 07:40:10 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=Ae6vJj2Y; 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 XNdOmwdsKvbG; Tue, 10 Dec 2019 07:40:10 +0100 (CET) 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 47X9RG2WmWz9vBmy; Tue, 10 Dec 2019 07:40:10 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1575960010; bh=OwdtjKhxdr7/aZ16cXB8T6/F98lgPqZDHw00Knn9Q18=; h=Subject:To:References:From:Date:In-Reply-To:From; b=Ae6vJj2Y8WYNKVmpXMI+6jQcBhSLTkIfBqzUbe8oAXbhnuyUCLQr8P0oWN3n64lOf DoarF53cv0oiDeazv87m2+BnSgkEHi3Kn0QzrxRXJTKvn7AJlaxUMflb3RNqy0Eb8O 07z4e15XGuVOUThOEVeLEr8fe/UK7iOxAqY3tnXI= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 1A7218B803; Tue, 10 Dec 2019 07:40:11 +0100 (CET) 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 ITyi-BVxuytF; Tue, 10 Dec 2019 07:40:11 +0100 (CET) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 135468B802; Tue, 10 Dec 2019 07:40:10 +0100 (CET) Subject: Re: [PATCH v2 2/4] kasan: use MAX_PTRS_PER_* for early shadow To: Daniel Axtens , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kasan-dev@googlegroups.com, aneesh.kumar@linux.ibm.com, bsingharora@gmail.com References: <20191210044714.27265-1-dja@axtens.net> <20191210044714.27265-3-dja@axtens.net> From: Christophe Leroy Message-ID: Date: Tue, 10 Dec 2019 07:40:09 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20191210044714.27265-3-dja@axtens.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Le 10/12/2019 =C3=A0 05:47, Daniel Axtens a =C3=A9crit=C2=A0: > This helps with powerpc support, and should have no effect on > anything else. As explained in previous patch, this patch is based on MAX_PTRS_PER_Pxx=20 existing for every arch using KASAN, allthought all arches but powerpc=20 will define it as PTRS_PER_Pxx. I think instead of forcing all arches to define that value, just define=20 a fallback in kasan.h (or somewhere else) would help keeping the changes=20 to the minimum, see below. >=20 > Suggested-by: Christophe Leroy > Signed-off-by: Daniel Axtens > --- > include/linux/kasan.h | 6 +++--- > mm/kasan/init.c | 6 +++--- > 2 files changed, 6 insertions(+), 6 deletions(-) >=20 > diff --git a/include/linux/kasan.h b/include/linux/kasan.h > index e18fe54969e9..d2f2a4ffcb12 100644 > --- a/include/linux/kasan.h > +++ b/include/linux/kasan.h > @@ -15,9 +15,9 @@ struct task_struct; > #include Add #ifndef MAX_PTRS_PER_PTE #define MAX_PTRS_PER_PTE PTRS_PER_PTE #endif #ifndef MAX_PTRS_PER_PMD #define MAX_PTRS_PER_PMD PTRS_PER_PMD #endif #ifndef MAX_PTRS_PER_PUD #define MAX_PTRS_PER_PUD PTRS_PER_PUD #endif #ifndef MAX_PTRS_PER_P4D #define MAX_PTRS_PER_P4D PTRS_PER_P4D #endif With that you don't need patch 1. > =20 > extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; > -extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; > -extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; > -extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD]; > +extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE]; > +extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD]; > +extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD]; > extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; > =20 > int kasan_populate_early_shadow(const void *shadow_start, > diff --git a/mm/kasan/init.c b/mm/kasan/init.c > index ce45c491ebcd..8b54a96d3b3e 100644 > --- a/mm/kasan/init.c > +++ b/mm/kasan/init.c > @@ -46,7 +46,7 @@ static inline bool kasan_p4d_table(pgd_t pgd) > } > #endif > #if CONFIG_PGTABLE_LEVELS > 3 > -pud_t kasan_early_shadow_pud[PTRS_PER_PUD] __page_aligned_bss; > +pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD] __page_aligned_bss; > static inline bool kasan_pud_table(p4d_t p4d) > { > return p4d_page(p4d) =3D=3D virt_to_page(lm_alias(kasan_early_shadow= _pud)); > @@ -58,7 +58,7 @@ static inline bool kasan_pud_table(p4d_t p4d) > } > #endif > #if CONFIG_PGTABLE_LEVELS > 2 > -pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD] __page_aligned_bss; > +pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD] __page_aligned_bss; > static inline bool kasan_pmd_table(pud_t pud) > { > return pud_page(pud) =3D=3D virt_to_page(lm_alias(kasan_early_shadow= _pmd)); > @@ -69,7 +69,7 @@ static inline bool kasan_pmd_table(pud_t pud) > return false; > } > #endif > -pte_t kasan_early_shadow_pte[PTRS_PER_PTE] __page_aligned_bss; > +pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE] __page_aligned_bss; > =20 > static inline bool kasan_pte_table(pmd_t pmd) > { >=20 Christophe