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Thu, 23 Jul 2026 14:03:28 +0000 (GMT) Received: from osiris (unknown [9.111.90.204]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTPS; Thu, 23 Jul 2026 14:03:28 +0000 (GMT) Date: Thu, 23 Jul 2026 16:03:26 +0200 From: Heiko Carstens To: Mete Durlu Cc: Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Ilya Leoshkevich , linux-s390@vger.kernel.org Subject: Re: [PATCH] s390/smp: Reflect (de)configured CPUs to cpu_enabled_mask Message-ID: <20260723140326.27454Ef4-hca@linux.ibm.com> References: <20260723-enabled_cpus-v1-1-3a2cbdc374b0@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260723-enabled_cpus-v1-1-3a2cbdc374b0@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: c8jDiL7TQKV1glGeIoqq0gHhdAX6I-od X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIzMDEzNSBTYWx0ZWRfX6LjtqHZ5ap3Y Xa+w620QXIvnpuyeNV7rEOnWrYadmxpkZBFlXbqVcBT5ZyZM6imTS4eXvilxpb7muN0a9ZDLSUi +jR/xug7BBA0RPph2iHBWYOb9LvAazm6g+utj91OlYW0Gbw88kxxgCVy9pq0tL6HLBTH15uk/Uu YqFXw4Yqb8N/Dna2fI3seKO4YvXoqYcB2PUC2sPb1mifVzUmXMERwftli6XQiK/G0tH7cgmO9d2 +7d50WVGRtK8rJeyClhAOSUxw5gnqXUYeTaYCvdZfkDUPlHz/sxXl5vYQ6wAnxWcVw2hc2C0vgz YHIW/R1INrG4avoFBPPjh7S2Xy3/VItN1tFSxDbIhG+3uZyXby5AzfhOBTd2PVQ5uSa4WWhItQe jkngtOAKO1uxuIlRQCWuyGs7N5hFnNBLOJ2gGJQUG7J0bKwEgzv18pg/FOkfNh9MrL2Ycog7/KD 8M1769DpdC0gVTu6sNg== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIzMDEzNSBTYWx0ZWRfX9cPPtP4xzpU2 rmwgOqFKZ0hJjNKJgqEQKhPHBPVA47K90gEwuELJBKWo7O2KRzMNvI8G8YniUbx7NdfU8Ugxq/l GZg2W4YV2lodC+d6cSd6YIXPF0smqwY= X-Proofpoint-GUID: c8jDiL7TQKV1glGeIoqq0gHhdAX6I-od X-Authority-Analysis: v=2.4 cv=SM5ykuvH c=1 sm=1 tr=0 ts=6a621f4d cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=kj9zAlcOel0A:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=dxUnBXBTGvNPyM1y3QAA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-23_04,2026-07-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 priorityscore=1501 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607230135 On Thu, Jul 23, 2026 at 03:36:43PM +0200, Mete Durlu wrote: > On s390, CPUs can be in a state where it is not possible to hotplug > them online before certain prequisite steps. For example the CPUs which > get introduced during runtime of a system can posses a "deconfigured" > state which prevents them from being hotplugged online before they get > configured. Another case is when users set the configured state of CPUs > themselves via "chcpu" or sysfs attributes. > > On s390 available CPUs are being registered as new devices via > smp_add_core() either during boot or after a CPU rescan (for newly added > CPUs during runtime). Registered CPUs are marked as enabled without > considering the configure states. Add necessary checks to smp_add_core() > and userspace configure attribute handler. Reflect the configured CPUs > to cpu_enabled_mask to correctly represent which CPUs can be hotplugged > online. > > Signed-off-by: Mete Durlu > --- > arch/s390/kernel/smp.c | 5 +++++ > 1 file changed, 5 insertions(+) Acked-by: Heiko Carstens