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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 5B7E7C54FCB for ; Sat, 25 Apr 2020 23:51:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3FF0B20672 for ; Sat, 25 Apr 2020 23:51:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726182AbgDYXvV (ORCPT ); Sat, 25 Apr 2020 19:51:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726070AbgDYXvT (ORCPT ); Sat, 25 Apr 2020 19:51:19 -0400 Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF9ECC061A0C for ; Sat, 25 Apr 2020 16:51:18 -0700 (PDT) Received: by ozlabs.org (Postfix, from userid 1034) id 498nqm63yRz9sSg; Sun, 26 Apr 2020 09:51:16 +1000 (AEST) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: feb8e960d780e170e992a70491eec9dd68f4dbf2 In-Reply-To: <540242f7d4573f7cdf1b3bf46bb35f743b2cd68f.1587124651.git.christophe.leroy@c-s.fr> To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc/mm: Fix CONFIG_PPC_KUAP_DEBUG on PPC32 Message-Id: <498nqm63yRz9sSg@ozlabs.org> Date: Sun, 26 Apr 2020 09:51:16 +1000 (AEST) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2020-04-17 at 11:58:36 UTC, Christophe Leroy wrote: > CONFIG_PPC_KUAP_DEBUG is not selectable because it depends on PPC_32 > which doesn't exists. > > Fixing it leads to a deadlock due to a vital register getting > clobbered in _switch(). > > Change dependency to PPC32 and use r0 instead of r4 in _switch() > > Fixes: e2fb9f544431 ("powerpc/32: Prepare for Kernel Userspace Access Protection") > Cc: stable@vger.kernel.org > Signed-off-by: Christophe Leroy Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/feb8e960d780e170e992a70491eec9dd68f4dbf2 cheers