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Mon, 11 Sep 2023 13:19:05 +0000 (UTC) Received: from piliu.users.ipa.redhat.com (unknown [10.72.120.8]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8DE692156701; Mon, 11 Sep 2023 13:19:00 +0000 (UTC) From: Pingfan Liu To: linuxppc-dev@lists.ozlabs.org Subject: [PATCHv6 0/3] enable nr_cpus for powerpc Date: Mon, 11 Sep 2023 21:18:52 +0800 Message-Id: <20230911131855.40738-1-piliu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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: Baoquan He , Pingfan Liu , kexec@lists.infradead.org, Mahesh Salgaonkar , Ming Lei , Wen Xiong , Nicholas Piggin Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Since my last v4 [1], the code has undergone great changes. The paca[] array has been reorganized and indexed by paca_ptrs[], which dramatically decreases the memory consumption even if there are many unpresent cpus in the middle. However, reordering the logical cpu numbers can further decrease the size of paca_ptrs[] in the kdump case. So I keep [1/3], which rotate-shifts the cpu's sequence number in the device tree to obtain the logical cpu id. Patch [2-3/3] make efforts to decrease the nr_cpus to be less than or equal to two. [1]: https://lore.kernel.org/linuxppc-dev/1520829790-14029-1-git-send-email-kernelfans@gmail.com/ Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Mahesh Salgaonkar Cc: Wen Xiong Cc: Baoquan He Cc: Ming Lei Cc: kexec@lists.infradead.org To: linuxppc-dev@lists.ozlabs.org v5 -> v6: assign nr_cpu_ids by set_nr_cpu_ids() to tackle with the issue if nr_cpu_ids is configured as a constant Pingfan Liu (3): powerpc/setup: Loosen the mapping between cpu logical id and its seq in dt powerpc/setup: Handle the case when boot_cpuid greater than nr_cpus powerpc/setup: alloc extra paca_ptrs to hold boot_cpuid arch/powerpc/kernel/paca.c | 10 +-- arch/powerpc/kernel/prom.c | 28 +++++--- arch/powerpc/kernel/setup-common.c | 106 ++++++++++++++++++++++++----- 3 files changed, 113 insertions(+), 31 deletions(-)