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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 1 Feb 2019 07:42:55 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x117gsPc61341948 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 1 Feb 2019 07:42:54 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 75E6BAE051; Fri, 1 Feb 2019 07:42:54 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 22755AE04D; Fri, 1 Feb 2019 07:42:54 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 1 Feb 2019 07:42:54 +0000 (GMT) Received: from pasglop (unknown [9.102.39.236]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id DBFAAA00FF; Fri, 1 Feb 2019 18:42:50 +1100 (AEDT) Subject: Re: Does SMP work at all on 40x ? From: Benjamin Herrenschmidt To: Christophe Leroy , Paul Mackerras , Michael Ellerman , "linuxppc-dev@lists.ozlabs.org" Date: Fri, 01 Feb 2019 18:42:50 +1100 In-Reply-To: <5c170dab-4f0b-8be2-e99a-9afd0fa02394@c-s.fr> References: <5c170dab-4f0b-8be2-e99a-9afd0fa02394@c-s.fr> Organization: IBM Australia User-Agent: Evolution 3.30.4 (3.30.4-1.fc29) Mime-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19020107-0008-0000-0000-000002B9B69F X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19020107-0009-0000-0000-00002225BD1B Message-Id: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-01_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=840 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902010057 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: , Reply-To: benh@au1.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, 2019-01-30 at 08:16 +0100, Christophe Leroy wrote: > In transfer_to_handler() (entry_32.S), we have: > > #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) > ... > #ifdef CONFIG_SMP > CURRENT_THREAD_INFO(r9, r1) > lwz r9,TI_CPU(r9) > slwi r9,r9,3 > add r11,r11,r9 > #endif > #endif > > When running this piece of code, MMU translation is off. But r9 contains > the virtual addr of current_thread_info, so unless I miss something, > this cannot work on the 40x, can it ? > > On CONFIG_BOOKE it works because phys addr = virt addr There is no 40x SMP that I am aware of. Cheers, Ben.