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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3FF9C00140 for ; Tue, 2 Aug 2022 17:48:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231361AbiHBRsD (ORCPT ); Tue, 2 Aug 2022 13:48:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40754 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229499AbiHBRr7 (ORCPT ); Tue, 2 Aug 2022 13:47:59 -0400 Received: from mail-yw1-x112d.google.com (mail-yw1-x112d.google.com [IPv6:2607:f8b0:4864:20::112d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C023DF51 for ; Tue, 2 Aug 2022 10:47:58 -0700 (PDT) Received: by mail-yw1-x112d.google.com with SMTP id 00721157ae682-32269d60830so148639077b3.2 for ; Tue, 02 Aug 2022 10:47:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc; bh=CyPUbDaavl0pxtUchWqOoJ+rGYNrTSx7Qsh7yOX4nqk=; b=Vi4b18H4ruvdsnsfKL+xHB8JIstAaWj9GfTkdEHEJfP6HGkV2K7VRqfDfHV17mNn9+ YfDABrmK4w3SaPqVBh5bXyQbe6x3QXHpoIU4WzT8xxgoUcS5ml2XHVtfsuJ2zqcQFhAd J8s0AZuAHn9KYK0oFgegc6so4j9E30I7XfPuVoFbmhCmTQvId+u5/XCreKdsxSA5N46X SzXnSQqra+iDjPn1Yh+9dDucGZnRiNvonatXvefk8NrHF+gnwxvG5okVRbt49+/VrHxu aM9r26REYHwDUJwLqat8Mxrb/RWmuMfHajj/WVBheWk/3pUXKjHQbhf0W8qkPy+w2fDD sXkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc; bh=CyPUbDaavl0pxtUchWqOoJ+rGYNrTSx7Qsh7yOX4nqk=; b=s3tyJMBDs+yyJtA1IWLqayau/SGxj45P/B137lz33gTJkU53xieswXNIYJ+ZxTLTtk t4GziZNprhGkLMLfx9LKr//ZZ/7YTmQyr7ttBcywjWSNkgBd6rgYMZ1uIGm/pSozzX4+ vfqC1QGOpKcOg0fgRvoW9CDoRtP6bMeh9uEMhTuprRTeP4nt6wHMMd6g5ecbeFG2Wn5b 3gP3REka1z2OU3jd8bebTxdgMPrY9H/9X3RaZNkYA3fugwkSqxH0WbAhCdSKwGr424E9 dhYBe0CUn6+miJuXJ/NU6BS1f9ROKP7bGzOtY8bRYfD0lyjS5bldry6qgNSx6KxHc5Mt 8caQ== X-Gm-Message-State: ACgBeo3Xi7qzU90qhbhUXAwONOmeCypNYW45oNBElQiEPS1OkV7Bjhlz ucvTjB7j+FEWTEEQLNbbUuai9FMnoc1pqTby50Nmhw== X-Google-Smtp-Source: AA6agR5ff/2YTaiH0o2yaXcd9Vb4iGB8rk5BtGV2WejE90cyd/4A41JUybbJAmYoeDw71I0Y93ZyFnAevmMFLK5vkyw= X-Received: by 2002:a81:5ca:0:b0:31f:38d6:f59f with SMTP id 193-20020a8105ca000000b0031f38d6f59fmr18721968ywf.324.1659462477479; Tue, 02 Aug 2022 10:47:57 -0700 (PDT) MIME-Version: 1.0 References: <20220701142310.2188015-1-glider@google.com> <20220701142310.2188015-30-glider@google.com> In-Reply-To: From: Alexander Potapenko Date: Tue, 2 Aug 2022 19:47:21 +0200 Message-ID: Subject: Re: [PATCH v4 29/45] block: kmsan: skip bio block merging logic for KMSAN To: Marco Elver Cc: Alexander Viro , Alexei Starovoitov , Andrew Morton , Andrey Konovalov , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Christoph Lameter , David Rientjes , Dmitry Vyukov , Eric Dumazet , Greg Kroah-Hartman , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jens Axboe , Joonsoo Kim , Kees Cook , Mark Rutland , Matthew Wilcox , "Michael S. Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , kasan-dev , Linux Memory Management List , Linux-Arch , LKML , Eric Biggers Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 13, 2022 at 12:23 PM Marco Elver wrote: > > On Fri, Jul 01, 2022 at 04:22PM +0200, 'Alexander Potapenko' via kasan-de= v wrote: > [...] > > --- a/block/bio.c > > +++ b/block/bio.c > > @@ -867,6 +867,8 @@ static inline bool page_is_mergeable(const struct b= io_vec *bv, > > return false; > > > > *same_page =3D ((vec_end_addr & PAGE_MASK) =3D=3D page_addr); > > + if (!*same_page && IS_ENABLED(CONFIG_KMSAN)) > > + return false; > > if (*same_page) > > return true; > > if (*same_page) > return true; > else if (IS_ENABLED(CONFIG_KMSAN)) > return false; > Done. > > return (bv->bv_page + bv_end / PAGE_SIZE) =3D=3D (page + off / PA= GE_SIZE); --=20 Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Stra=C3=9Fe, 33 80636 M=C3=BCnchen Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Liana Sebastian Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg