linux-kernel - Re: [PATCH v3 3/3] cxl/region: Simplify cxl_region

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Date: Fri, 21 Jun 2024 10:25:24 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>,  Dave Jiang
 <dave.jiang@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>,  <linux-cxl@...r.kernel.org>,
  <linux-kernel@...r.kernel.org>,  Alison Schofield
 <alison.schofield@...el.com>,  Andrew Morton <akpm@...ux-foundation.org>,
  Bharata B Rao <bharata@....com>,  Alistair Popple <apopple@...dia.com>,
  "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,  Davidlohr Bueso
 <dave@...olabs.net>,  Vishal Verma <vishal.l.verma@...el.com>,  Ira Weiny
 <ira.weiny@...el.com>
Subject: Re: [PATCH v3 3/3] cxl/region: Simplify cxl_region_nid()

Jonathan Cameron <Jonathan.Cameron@...wei.com> writes:

> On Tue, 18 Jun 2024 16:46:39 +0800
> Huang Ying <ying.huang@...el.com> wrote:
>
>> The node ID of the region can be gotten via resource start address
>> directly.  This simplifies the implementation of cxl_region_nid().
>> 
>> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
>> Suggested-by: Alison Schofield <alison.schofield@...el.com>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Cc: Dave Jiang <dave.jiang@...el.com>
>> Cc: Bharata B Rao <bharata@....com>
>> Cc: Alistair Popple <apopple@...dia.com>
>> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
>> Cc: Davidlohr Bueso <dave@...olabs.net>
>> Cc: Vishal Verma <vishal.l.verma@...el.com>
>> Cc: Ira Weiny <ira.weiny@...el.com>
>> ---
>>  drivers/cxl/core/region.c | 10 ++++------
>>  1 file changed, 4 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
>> index dc15ceba7ab7..605efe3562c6 100644
>> --- a/drivers/cxl/core/region.c
>> +++ b/drivers/cxl/core/region.c
>> @@ -2309,15 +2309,13 @@ static bool cxl_region_update_coordinates(struct cxl_region *cxlr, int nid)
>>  static int cxl_region_nid(struct cxl_region *cxlr)
>>  {
>>  	struct cxl_region_params *p = &cxlr->params;
>> -	struct cxl_endpoint_decoder *cxled;
>> -	struct cxl_decoder *cxld;
>> +	struct resource *res;
>>  
>>  	guard(rwsem_read)(&cxl_region_rwsem);
>> -	cxled = p->targets[0];
>> -	if (!cxled)
>> +        res = p->res;
>
> Odd indent - I think spaces rather than tab.  Otherwise seems
> reasonable.

Good catch!  I used spaces accidently.

Hi, Dave,

Do you need me to send a new version?  Or you can change it?

> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Thank you very much for your review!

--
Best Regards,
Huang, Ying

>
>> +	if (!res)
>>  		return NUMA_NO_NODE;
>> -	cxld = &cxled->cxld;
>> -	return phys_to_target_node(cxld->hpa_range.start);
>> +	return phys_to_target_node(res->start);
>>  }
>>  
>>  static int cxl_region_perf_attrs_callback(struct notifier_block *nb,