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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id A026DC433F5 for ; Tue, 25 Jan 2022 21:10:22 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 174C56B0075; Tue, 25 Jan 2022 16:10:22 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1254C6B007B; Tue, 25 Jan 2022 16:10:22 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F2E5D6B007D; Tue, 25 Jan 2022 16:10:21 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0029.hostedemail.com [216.40.44.29]) by kanga.kvack.org (Postfix) with ESMTP id E41B46B0075 for ; Tue, 25 Jan 2022 16:10:21 -0500 (EST) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A362A92EC4 for ; Tue, 25 Jan 2022 21:10:21 +0000 (UTC) X-FDA: 79070052642.05.846D06C Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf13.hostedemail.com (Postfix) with ESMTP id 0F0612001D for ; Tue, 25 Jan 2022 21:10:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=9sBIA+4FUEiJsQc79gzBYm8TOBmdFpT74KXdSSubq6E=; b=eSKbIlnsv6RWgx7nwqgpkPqt5q EeCKatmP3k8DXITTemQLP53mSBz51qcd/VQGIhMSObhR+bTW5Cj8VBAXKYwj2Lil106cEWpZw88L5 +VhQL/T1F4csdtkaIllFtvH3ArdQr7c4PoGbqaIhGAfeWq2WmnYyVpaPy8AjAzIvTGt65X/nxKURK ILINrwlO+ff2g782ZKFNBQPDrt2Zn6A5rwafsEW3/ImsPmPhBxFpMZIjNpgQnXxed6MX6D9hAABLV 86OBLVcWGuI5Uf68fz1pNxiLkn30JJ+zWGrL+0m5BMhMRpysm1FMtgSq4nkKQDLiF9ZhIviZ3vNhP SiSkuCfg==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nCT4w-009ZLT-9v; Tue, 25 Jan 2022 21:10:14 +0000 Date: Tue, 25 Jan 2022 13:10:14 -0800 From: Luis Chamberlain To: Christophe Leroy Cc: Jessica Yu , "linux-kernel@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "kgdb-bugreport@lists.sourceforge.net" , "linux-mm@kvack.org" , "linux-arch@vger.kernel.org" , Jason Wessel , Daniel Thompson , Douglas Anderson Subject: Re: [PATCH 6/7] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC Message-ID: References: <848d857871f457f4df37e80fad468d615b237c24.1643015752.git.christophe.leroy@csgroup.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <848d857871f457f4df37e80fad468d615b237c24.1643015752.git.christophe.leroy@csgroup.eu> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 0F0612001D X-Stat-Signature: wb54xx1nwmobzoftc8bfwpzf3oughfcd X-Rspam-User: nil Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=eSKbIlns; spf=none (imf13.hostedemail.com: domain of mcgrof@infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=mcgrof@infradead.org; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) X-HE-Tag: 1643145018-992585 X-Bogosity: Ham, tests=bogofilter, spamicity=0.058444, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jan 24, 2022 at 09:22:34AM +0000, Christophe Leroy wrote: > This can also be useful on other powerpc/32 in order to maximize the > chance of code being close enough to kernel core to avoid branch > trampolines. Curious about all this branch trampoline talk. Do you have data to show negative impact with things as-is? Also, was powerpc/32 broken then without this? The commit log seems to suggest so, but I don't think that's the case. How was this issue noticed? Are there other future CPU families being planned where this is all true for as well? Are they goin to be 32-bit as well? Luis