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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 E0748C43387 for ; Wed, 9 Jan 2019 10:10:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B8EF821738 for ; Wed, 9 Jan 2019 10:10:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730102AbfAIKKf (ORCPT ); Wed, 9 Jan 2019 05:10:35 -0500 Received: from foss.arm.com ([217.140.101.70]:39890 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729281AbfAIKKe (ORCPT ); Wed, 9 Jan 2019 05:10:34 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B738480D; Wed, 9 Jan 2019 02:10:33 -0800 (PST) Received: from [10.1.196.72] (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CC3893F70D; Wed, 9 Jan 2019 02:10:27 -0800 (PST) Subject: Re: [PATCH v3 1/3] kasan, arm64: use ARCH_SLAB_MINALIGN instead of manual aligning To: Andrey Konovalov , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Catalin Marinas , Will Deacon , Christoph Lameter , Andrew Morton , Mark Rutland , Nick Desaulniers , Marc Zyngier , Dave Martin , Ard Biesheuvel , "Eric W . Biederman" , Ingo Molnar , Paul Lawrence , Geert Uytterhoeven , Arnd Bergmann , "Kirill A . Shutemov" , Greg Kroah-Hartman , Kate Stewart , Mike Rapoport , kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sparse@vger.kernel.org, linux-mm@kvack.org, linux-kbuild@vger.kernel.org Cc: Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Jann Horn , Mark Brand , Chintan Pandya , Vishwath Mohan References: <52ddd881916bcc153a9924c154daacde78522227.1546540962.git.andreyknvl@google.com> From: Vincenzo Frascino Message-ID: Date: Wed, 9 Jan 2019 10:10:26 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <52ddd881916bcc153a9924c154daacde78522227.1546540962.git.andreyknvl@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/01/2019 18:45, Andrey Konovalov wrote: > Instead of changing cache->align to be aligned to KASAN_SHADOW_SCALE_SIZE > in kasan_cache_create() we can reuse the ARCH_SLAB_MINALIGN macro. > > Suggested-by: Vincenzo Frascino > Signed-off-by: Andrey Konovalov > --- > arch/arm64/include/asm/cache.h | 6 ++++++ > mm/kasan/common.c | 2 -- > 2 files changed, 6 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h > index 13dd42c3ad4e..eb43e09c1980 100644 > --- a/arch/arm64/include/asm/cache.h > +++ b/arch/arm64/include/asm/cache.h > @@ -58,6 +58,12 @@ > */ > #define ARCH_DMA_MINALIGN (128) > > +#ifdef CONFIG_KASAN_SW_TAGS > +#define ARCH_SLAB_MINALIGN (1ULL << KASAN_SHADOW_SCALE_SHIFT) > +#else > +#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) > +#endif > + Could you please remove the "#else" case here, because it is redundant (it is defined in linux/slab.h as ifndef) and could be misleading in future? > #ifndef __ASSEMBLY__ > > #include > diff --git a/mm/kasan/common.c b/mm/kasan/common.c > index 03d5d1374ca7..44390392d4c9 100644 > --- a/mm/kasan/common.c > +++ b/mm/kasan/common.c > @@ -298,8 +298,6 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, > return; > } > > - cache->align = round_up(cache->align, KASAN_SHADOW_SCALE_SIZE); > - > *flags |= SLAB_KASAN; > } > > -- Regards, Vincenzo