Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752777AbdCAQL4 (ORCPT ); Wed, 1 Mar 2017 11:11:56 -0500 Received: from mail-it0-f44.google.com ([209.85.214.44]:34967 "EHLO mail-it0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752486AbdCAQLt (ORCPT ); Wed, 1 Mar 2017 11:11:49 -0500 Date: Wed, 1 Mar 2017 09:02:33 -0700 From: Mathieu Poirier To: Leo Yan Cc: Rob Herring , Mark Rutland , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mike.leach@linaro.org Subject: Re: [PATCH v2 2/3] coresight: refactor with function of_coresight_get_cpu Message-ID: <20170301160233.GB4009@linaro.org> References: <1488294420-14188-1-git-send-email-leo.yan@linaro.org> <1488294420-14188-3-git-send-email-leo.yan@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1488294420-14188-3-git-send-email-leo.yan@linaro.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3192 Lines: 103 On Tue, Feb 28, 2017 at 11:06:59PM +0800, Leo Yan wrote: > This is refactor to add function of_coresight_get_cpu(), so it's used to > retrieve CPU id for coresight component. Finally can use it as a common > function for multiple places. > > Suggested-by: Mathieu Poirier > Signed-off-by: Leo Yan > --- > drivers/hwtracing/coresight/of_coresight.c | 35 ++++++++++++++++++++---------- > include/linux/coresight.h | 2 ++ > 2 files changed, 25 insertions(+), 12 deletions(-) > > diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c > index 629e031..2e7bbe2 100644 > --- a/drivers/hwtracing/coresight/of_coresight.c > +++ b/drivers/hwtracing/coresight/of_coresight.c > @@ -101,14 +101,34 @@ static int of_coresight_alloc_memory(struct device *dev, > return 0; > } > > +int of_coresight_get_cpu(struct device_node *node) > +{ > + int cpu; > + struct device_node *dn; > + > + dn = of_parse_phandle(node, "cpu", 0); > + > + /* Affinity defaults to CPU0 */ > + if (!dn) > + return 0; > + > + for_each_possible_cpu(cpu) { > + if (dn == of_get_cpu_node(cpu, NULL)) > + break; > + } > + of_node_put(dn); In the case where no CPU nodes are found this function will return the number of the last CPU that was probed instead of '0'. > + > + return cpu; > +} > +EXPORT_SYMBOL_GPL(of_coresight_get_cpu); Any reason you exported this - the fact that is it declared in corsight.h should be enough. Thanks, Mathieu > + > struct coresight_platform_data *of_get_coresight_platform_data( > struct device *dev, struct device_node *node) > { > - int i = 0, ret = 0, cpu; > + int i = 0, ret = 0; > struct coresight_platform_data *pdata; > struct of_endpoint endpoint, rendpoint; > struct device *rdev; > - struct device_node *dn; > struct device_node *ep = NULL; > struct device_node *rparent = NULL; > struct device_node *rport = NULL; > @@ -175,16 +195,7 @@ struct coresight_platform_data *of_get_coresight_platform_data( > } while (ep); > } > > - /* Affinity defaults to CPU0 */ > - pdata->cpu = 0; > - dn = of_parse_phandle(node, "cpu", 0); > - for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) { > - if (dn == of_get_cpu_node(cpu, NULL)) { > - pdata->cpu = cpu; > - break; > - } > - } > - of_node_put(dn); > + pdata->cpu = of_coresight_get_cpu(node); > > return pdata; > } > diff --git a/include/linux/coresight.h b/include/linux/coresight.h > index 2a5982c..6709561 100644 > --- a/include/linux/coresight.h > +++ b/include/linux/coresight.h > @@ -263,11 +263,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset, > #endif > > #ifdef CONFIG_OF > +extern int of_coresight_get_cpu(struct device_node *node); > extern struct coresight_platform_data *of_get_coresight_platform_data( > struct device *dev, struct device_node *node); > #else > static inline struct coresight_platform_data *of_get_coresight_platform_data( > struct device *dev, struct device_node *node) { return NULL; } > +static int of_coresight_get_cpu(struct device_node *node) { return 0; } > #endif > > #ifdef CONFIG_PID_NS > -- > 2.7.4 >