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[23.128.96.18]) by mx.google.com with ESMTP id z28si13075716pgc.63.2021.04.19.20.12.22; Mon, 19 Apr 2021 20:12:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=cmFm54dB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233670AbhDTDLi (ORCPT + 99 others); Mon, 19 Apr 2021 23:11:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbhDTDLh (ORCPT ); Mon, 19 Apr 2021 23:11:37 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88327C06174A; Mon, 19 Apr 2021 20:11:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=AqTuRNKIkAmLe8Av3ztkUAdmYLIeq8PftziUxkdnED4=; b=cmFm54dBhWL/FJIZPa1qLdPQCh Hw3d+6yeN1BRhVLA8lXi0+OxBNGlwLN0iOxnz1tNw19z7dwED70uUHLHZ0QHCfVKNKBQenpL6sjTp RiTDO60rG0H/+Io0sMW2Sl9Yi8uXuQbOmHCm5NzIBmET6uhHQgkerVA9dwlFEY8qLE05GHB/V0PuZ Ao/jqa8j5AAd9wR8FIZ6K7RUe8Zya2Y8SayHTkT8KDCcVbyrGWXzGbXLEMb2IexWdlSkgwpOFyitu JUjQ4dGrsXV5WoOuWngimlVppnjX5FKsAVbm0+zGZtX6LrP+cU2NI9VCFMIOrg0zh0XBFnqcrMJKV Y0NuvgGw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lYgmT-00Ee86-KY; Tue, 20 Apr 2021 03:10:34 +0000 Date: Tue, 20 Apr 2021 04:10:29 +0100 From: Matthew Wilcox To: Vineet Gupta Cc: "brouer@redhat.com" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "ilias.apalodimas@linaro.org" , "mcroce@linux.microsoft.com" , "grygorii.strashko@ti.com" , "arnd@kernel.org" , "hch@lst.de" , "linux-snps-arc@lists.infradead.org" , "mhocko@kernel.org" , "mgorman@suse.de" Subject: Re: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems Message-ID: <20210420031029.GI2531743@casper.infradead.org> References: <20210416230724.2519198-1-willy@infradead.org> <20210416230724.2519198-2-willy@infradead.org> <20210417024522.GP2531743@casper.infradead.org> <9f99b0a0-f1c1-f3b0-5f84-3a4bfc711725@synopsys.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9f99b0a0-f1c1-f3b0-5f84-3a4bfc711725@synopsys.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 20, 2021 at 02:48:17AM +0000, Vineet Gupta wrote: > > 32-bit architectures which expect 8-byte alignment for 8-byte integers > > and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct > > page inadvertently expanded in 2019. > > FWIW, ARC doesn't require 8 byte alignment for 8 byte integers. This is > only needed for 8-byte atomics due to the requirements of LLOCKD/SCOND > instructions. Ah, like x86? OK, great, I'll drop your arch from the list of affected. Thanks!