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=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 2B125C432BE for ; Thu, 2 Sep 2021 14:06:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08C0F610CE for ; Thu, 2 Sep 2021 14:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233999AbhIBOHv (ORCPT ); Thu, 2 Sep 2021 10:07:51 -0400 Received: from mout.gmx.net ([212.227.15.18]:50067 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233793AbhIBOHm (ORCPT ); Thu, 2 Sep 2021 10:07:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1630591593; bh=iv0nS71Sf7lOrxO5VrVbRqiH9D6xAHfduMEe/ajOLho=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject:References:In-Reply-To; b=KGJKJa/lQjU/su+OaNEWlC9GcW3dlciffD/g1AuHuiN1b8a5NH7XjUjOnVUMBEVhJ UXKQIkgqGmI29pL1VIrPtkMwpC2Qixvj7q4Z1HR/wPGLc01z6Y/5MWUxHiAfaYQxDd 6CyHAs6LbSySWbpG5ZJKlFJRx5wvuvl95wrIIDag= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from ls3530 ([92.116.158.38]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MOzOw-1mcCge3PfY-00PO4n; Thu, 02 Sep 2021 16:06:32 +0200 Date: Thu, 2 Sep 2021 16:06:28 +0200 From: Helge Deller To: Helge Deller Cc: linux-parisc@vger.kernel.org, James Bottomley , John David Anglin , Arnd Bergmann Subject: Re: [PATCH v2] parisc: Fix boot with kernel v5.14 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Provags-ID: V03:K1:h0AyGNG9WYoXrsVFIIHYs5jLsNGG89ySDMU/0l9fwYOYl9/C1DM cDePvzRlugW+uMZ04ghy0fxX2jeIl46HkSrKlrcM+etCTkTPt4J0Qcvzfm/l3T8lK9r8nHk ENYghO7nET24GZkT3SdhpGoyE82uksZDB+XYCQ/NN/ZxPjzbRktd1uktdIokqtvrvRqbloB KrNogZBCgOddQ2qjNTR6Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:f7swG4OpvjY=:323dJKI+F0jCmf9EHqe8T5 LfEXYu+b3GfrEk+T7dGbfBQeYmWbnqzNR9GbBGTAxYfofbegHUboVe6WfNKPGV4OKFFBPsrrk qbvm9ScMaIokgPheNW2kXKK/N4vnbR7gJgH3VM25qOd+YfeKke5IWb7DepmVV4npfoZXS/309 lny9ctrJG4Gzt/IVwY1d+IZr1mmHTLaTeTI2G0B2a09pXbXaGPHLQLRgP2KvRg1fcFJDZmgR5 ekzN2TCeo315TTaSnqzMA4jBmCLYBcgP7ikCMemEebeVFKbhSG7QQuaVhmiyqf4Sydhkr1kK6 5Dkg/7iEdtUfKI9SV38qtTyg/+3KARkmMK/uu95QqMaWpWpQv32UweF4+SUSPrlJBANsY9Rez WRSCw2hQWcmsEQftyy4hXPAWjAge50R3Eu3/R8nyg0X0IbI+l7iXS9MjQ3F+aNuO3+NUTtbhj qSJBV53NhGgqIdC2Sw3lyqoUabUg4YEGoSwh+3HBCRkaMLkj1Dt9Luqwey58Z5XYzZAzP9hvH H3U1eOZOY+TNVV71pqr2CupZRILxue+2RMpyJkpLLg0eqr54NisCXXDVJNfnitM2zd32HLJ0u 6sPFmnzC9SwdQL0dbdADhC3hBlVBf/IIlJG8HG6gaSQlGNTQit/lUhERxHZ0/0h291UDI4vpk I8xDmT/EI1j4NSu4+ZrSDqltaq7jmWa4jMS5eODy6yKwfH5/ReZSYMXBcnsUeKOxy4VXAMSE5 PyfWrEsLKQJ5I3nchfdIVDmOjIkqfu+F0B/XphxUtUSJhdKLxY9ajk02K9dllVZuVmm6Ewii2 shO1g1PSLULnK0HzJi/v/VkTOL3gDWoDyQlPmPVjAXIJX4vnmpPzRiKO3MoS7gl4qmYNvb556 pKRwk3qlX04QS+gHf9bPRTUvPGC+9k/fVwpRuxE1emGKEDll9fmVKChWN/G0yzJIPSuds1995 oScLiSHAtw29jgwCxrYif+hQ4nmE3zzf15xKSYXjjD6XDUEXzxyu2xN1Uwp7cNpbbyIxPRcDk x0gn2e5+4WKWFbxlI2Vok+0OI+cdPRgjfqyC53RDtPibI2NCRJa4Z8gPVRnQyW2xAJLoi2gRN Cfo9nzkRPf+cVynldJ8RLR60T2EkBLGPVWS Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org Kernel v5.14 has various changes to optimize unaligned memory accesses, e.g. commit 0652035a5794 ("asm-generic: unaligned: remove byteshift helper= s"). Those changes break the bootloader and other places in kernel for parisc which needs byte-wise accesses to unaligned memory. Here is an updated patch/hack which fixes those boot problems by adding a compiler optimization barrier. More info and background can be found in = BZ: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102162 Signed-off-by: Helge Deller diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unalign= ed.h index 1c4242416c9f..fdb6864514b1 100644 =2D-- a/include/asm-generic/unaligned.h +++ b/include/asm-generic/unaligned.h @@ -11,11 +11,13 @@ #define __get_unaligned_t(type, ptr) ({ \ const struct { type x; } __packed *__pptr =3D (typeof(__pptr))(ptr); \ + __asm__ ("" : "+r" (__pptr)); \ __pptr->x; \ }) #define __put_unaligned_t(type, val, ptr) do { \ struct { type x; } __packed *__pptr =3D (typeof(__pptr))(ptr); \ + __asm__ ("" : "+r" (__pptr)); \ __pptr->x =3D (val); \ } while (0)