Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754669Ab3HPIsV (ORCPT ); Fri, 16 Aug 2013 04:48:21 -0400 Received: from service87.mimecast.com ([91.220.42.44]:46597 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754632Ab3HPIsQ convert rfc822-to-8bit (ORCPT ); Fri, 16 Aug 2013 04:48:16 -0400 Message-ID: <520DE753.8090601@arm.com> Date: Fri, 16 Aug 2013 09:48:19 +0100 From: Sudeep KarkadaNagesha User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8 MIME-Version: 1.0 To: Benjamin Herrenschmidt CC: Sudeep KarkadaNagesha , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-pm@vger.kernel.org" , "devicetree@vger.kernel.org" , "microblaze-uclinux@itee.uq.edu.au" , "linux@openrisc.net" , "linuxppc-dev@lists.ozlabs.org" , Jonas Bonn , Michal Simek , "Rafael J. Wysocki" , "grant.likely@linaro.org" , "rob.herring@calxeda.com" Subject: Re: [RFC PATCH 3/4] powerpc: refactor of_get_cpu_node to support other architectures References: <1374492747-13879-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> <1376586580-5409-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> <1376586580-5409-4-git-send-email-Sudeep.KarkadaNagesha@arm.com> <1376628563.4255.137.camel@pasglop> In-Reply-To: <1376628563.4255.137.camel@pasglop> X-OriginalArrivalTime: 16 Aug 2013 08:48:11.0228 (UTC) FILETIME=[5662E1C0:01CE9A5D] X-MC-Unique: 113081609481401001 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1938 Lines: 60 On 16/08/13 05:49, Benjamin Herrenschmidt wrote: > On Thu, 2013-08-15 at 18:09 +0100, Sudeep KarkadaNagesha wrote: >> From: Sudeep KarkadaNagesha >> >> Currently different drivers requiring to access cpu device node are >> parsing the device tree themselves. Since the ordering in the DT need >> not match the logical cpu ordering, the parsing logic needs to consider >> that. However, this has resulted in lots of code duplication and in some >> cases even incorrect logic. > > .../... > >> >> +bool arch_match_cpu_phys_id(int cpu, u64 phys_id) >> +{ >> + return (int)phys_id == get_hard_smp_processor_id(cpu); >> +} > > Naming is a bit gross. You might want to make it clearer that > we are talking about CPU IDs in the device-tree here. > Any particular preference to the name or just a note is sufficient. Also unlike PPC, in ARM we don't set hard processor id value based values read from device tree. DT must contain the values matching to the hardware ID registers. >> +static bool __of_find_n_match_cpu_property(struct device_node *cpun, >> + const char *prop_name, int cpu, unsigned int *thread) >> +{ >> + const __be32 *cell; >> + int ac, prop_len, tid; >> + u64 hwid; >> + >> + ac = of_n_addr_cells(cpun); >> + cell = of_get_property(cpun, prop_name, &prop_len); >> + if (!cell) >> + return false; >> + prop_len /= sizeof(*cell); >> + for (tid = 0; tid < prop_len; tid++) { >> + hwid = of_read_number(cell, ac); >> + if (arch_match_cpu_phys_id(cpu, hwid)) { >> + if (thread) >> + *thread = tid; >> + return true; >> + } > > Missing: cell += ac; Ah, missed it while refactoring, will fix it. Thanks Regards, Sudeep -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/