Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751698AbbKPL0p (ORCPT ); Mon, 16 Nov 2015 06:26:45 -0500 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]:27343 "EHLO eu-smtp-delivery-143.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750865AbbKPL0o convert rfc822-to-8bit (ORCPT ); Mon, 16 Nov 2015 06:26:44 -0500 Subject: Re: [PATCH v7 0/4] KASAN for arm64 To: Andrey Ryabinin References: <1444665180-301-1-git-send-email-ryabinin.a.a@gmail.com> <20151013083432.GG6320@e104818-lin.cambridge.arm.com> Cc: Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, Yury , Alexey Klimov , Arnd Bergmann , linux-mm@kvack.org, Andrey Konovalov , Linus Walleij , Ard Biesheuvel , linux-kernel@vger.kernel.org, kasan-dev , David Keitel , Alexander Potapenko , Dmitry Vyukov From: "Suzuki K. Poulose" Message-ID: <5649BAFD.6030005@arm.com> Date: Mon, 16 Nov 2015 11:16:13 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <20151013083432.GG6320@e104818-lin.cambridge.arm.com> X-OriginalArrivalTime: 16 Nov 2015 11:16:13.0436 (UTC) FILETIME=[3426C3C0:01D12060] X-MC-Unique: Os78psVFTvClxw7KfsmbFg-1 Content-Type: text/plain; charset=WINDOWS-1252; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2049 Lines: 52 On 13/10/15 09:34, Catalin Marinas wrote: > On Mon, Oct 12, 2015 at 06:52:56PM +0300, Andrey Ryabinin wrote: >> Andrey Ryabinin (3): >> arm64: move PGD_SIZE definition to pgalloc.h >> arm64: add KASAN support >> Documentation/features/KASAN: arm64 supports KASAN now >> >> Linus Walleij (1): >> ARM64: kasan: print memory assignment > > Patches queued for 4.4. Thanks. > Hi, I get the following failure with KASAN + 16K_PAGES + 48BIT_VA, with 4.4-rc1: arch/arm64/mm/kasan_init.c: In function ?kasan_early_init?: include/linux/compiler.h:484:38: error: call to ?__compiletime_assert_95? declared with attribute error: BUILD_BUG_ON failed: !IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE) _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/compiler.h:467:4: note: in definition of macro ?__compiletime_assert? prefix ## suffix(); \ ^ include/linux/compiler.h:484:2: note: in expansion of macro ?_compiletime_assert? _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/bug.h:50:37: note: in expansion of macro ?compiletime_assert? #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/bug.h:74:2: note: in expansion of macro ?BUILD_BUG_ON_MSG? BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^ arch/arm64/mm/kasan_init.c:95:2: note: in expansion of macro ?BUILD_BUG_ON? BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE)); --- The problem is that the PGDIR_SIZE is (1UL << 47) with 16K+48bit, which makes the KASAN_SHADOW_END unaligned(which is aligned to (1UL << (48 - 3)) ). Is the alignment really needed ? Thoughts on how best we could fix this ? Cheers Suzuki -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/