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=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 08B4FC433E6 for ; Fri, 12 Feb 2021 00:20:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA48F64DD5 for ; Fri, 12 Feb 2021 00:20:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230187AbhBLAUv (ORCPT ); Thu, 11 Feb 2021 19:20:51 -0500 Received: from ozlabs.org ([203.11.71.1]:33479 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229647AbhBLAUi (ORCPT ); Thu, 11 Feb 2021 19:20:38 -0500 Received: by ozlabs.org (Postfix, from userid 1034) id 4DcDf21YQpz9sRf; Fri, 12 Feb 2021 11:19:54 +1100 (AEDT) From: Michael Ellerman To: Paul Mackerras , Michael Ellerman , Benjamin Herrenschmidt , Christophe Leroy Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org In-Reply-To: <5ae4d545e3ac58e133d2599e0deb88843cb494fc.1612768623.git.christophe.leroy@csgroup.eu> References: <5ae4d545e3ac58e133d2599e0deb88843cb494fc.1612768623.git.christophe.leroy@csgroup.eu> Subject: Re: [PATCH] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error Message-Id: <161308904010.3606979.18330739657598413446.b4-ty@ellerman.id.au> Date: Fri, 12 Feb 2021 11:19:54 +1100 (AEDT) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 8 Feb 2021 07:17:40 +0000 (UTC), Christophe Leroy wrote: > THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1 > Maximum PAGE_SHIFT is 18 for 256k pages so > THREAD_ALIGN_SHIFT is 19 at the maximum. > > No need to clobber cr1, it can be preserved when moving r1 > into CR when we check stack overflow. > > [...] Applied to powerpc/next. [1/1] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error https://git.kernel.org/powerpc/c/3642eb21256a317ac14e9ed560242c6d20cf06d9 cheers 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=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 EFB7EC433DB for ; Fri, 12 Feb 2021 00:29:08 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3EFAE64DDA for ; Fri, 12 Feb 2021 00:29:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3EFAE64DDA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4DcDrd3GDQzDsjG for ; Fri, 12 Feb 2021 11:29:05 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DcDf36V12zDwlq for ; Fri, 12 Feb 2021 11:19:55 +1100 (AEDT) Received: by ozlabs.org (Postfix, from userid 1034) id 4DcDf21YQpz9sRf; Fri, 12 Feb 2021 11:19:54 +1100 (AEDT) From: Michael Ellerman To: Paul Mackerras , Michael Ellerman , Benjamin Herrenschmidt , Christophe Leroy In-Reply-To: <5ae4d545e3ac58e133d2599e0deb88843cb494fc.1612768623.git.christophe.leroy@csgroup.eu> References: <5ae4d545e3ac58e133d2599e0deb88843cb494fc.1612768623.git.christophe.leroy@csgroup.eu> Subject: Re: [PATCH] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error Message-Id: <161308904010.3606979.18330739657598413446.b4-ty@ellerman.id.au> Date: Fri, 12 Feb 2021 11:19:54 +1100 (AEDT) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, 8 Feb 2021 07:17:40 +0000 (UTC), Christophe Leroy wrote: > THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1 > Maximum PAGE_SHIFT is 18 for 256k pages so > THREAD_ALIGN_SHIFT is 19 at the maximum. > > No need to clobber cr1, it can be preserved when moving r1 > into CR when we check stack overflow. > > [...] Applied to powerpc/next. [1/1] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error https://git.kernel.org/powerpc/c/3642eb21256a317ac14e9ed560242c6d20cf06d9 cheers