On 10/18/2017 07:28 PM, Shu Wang wrote:
From: "Guenter Roeck" <linux@xxxxxxxxxxxx>
To: "Shu Wang" <shuwang@xxxxxxxxxx>
Cc: "fenghua yu" <fenghua.yu@xxxxxxxxx>, jdelvare@xxxxxxxx, linux-hwmon@xxxxxxxxxxxxxxx,
linux-kernel@xxxxxxxxxxxxxxx, chuhu@xxxxxxxxxx, yizhan@xxxxxxxxxx
Sent: Wednesday, October 18, 2017 9:14:39 PM
Subject: Re: [PATCH] hwmon: (coretemp) remove duplicated coretemp for same core id
On 10/17/2017 08:21 PM, Shu Wang wrote:
From: "Guenter Roeck" <linux@xxxxxxxxxxxx>
To: shuwang@xxxxxxxxxx
Cc: "fenghua yu" <fenghua.yu@xxxxxxxxx>, jdelvare@xxxxxxxx,
linux-hwmon@xxxxxxxxxxxxxxx,
linux-kernel@xxxxxxxxxxxxxxx, chuhu@xxxxxxxxxx, yizhan@xxxxxxxxxx
Sent: Tuesday, October 17, 2017 11:25:50 PM
Subject: Re: [PATCH] hwmon: (coretemp) remove duplicated coretemp for same
core id
On Tue, Oct 17, 2017 at 04:44:50PM +0800, shuwang@xxxxxxxxxx wrote:
From: Shu Wang <shuwang@xxxxxxxxxx>
Fix kernel warning on my 4cpus 2core_id system. The cpu0 and cpu1 have
same core_id 0, so both cpu0 and cpu1 will try to create file temp2_label
when it's online.
What system/cpu is that ?
Normally I would assume that each CPU (package) instantiates
a separate instance of the driver.
The system is ThinkPad X1 Carbon 3rd laptop, model 20BTS1N70F.
- coretemp_cpu_online(cpu=0)
- create_core_data(cpu=0, attr_no=2)
- create_core_attrs(attr_no=2)
- coretemp_cpu_online(cpu=1)
- create_core_data(cpu=1, attr_no=2)
- create_core_attrs(attr_no=2)
$ grep -e processor -e 'core id' /proc/cpuinfo
processor : 0
core id : 0
processor : 1
core id : 0
processor : 2
core id : 1
processor : 3
core id : 1
Complete output of /proc/cpuinfo might be helpful.
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 61
model name : Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz
This is a hyperthreading CPU, which should already be handled,
Do you mean that for my system, coretemp_cpu_online should only
be called twice instead of four times to create two core attrs?
coretemp_add_core() should only be called twice, and cpumask_intersects()
should filter out the duplicate ones.
/*
* Check whether a thread sibling is already online. If not add the
* interface for this CPU core.
*/
if (!cpumask_intersects(&pdata->cpumask, topology_sibling_cpumask(cpu)))
coretemp_add_core(pdev, cpu, 0);
Thomas, is it possible that something is wrong with this code ?
Guenter
and the problem would affect pretty much everyone. I'll have
to look into this more closely. Is this with the ToT kernel ?
What's a ToT kernel? The kernel I built was the latest
kernel-4.14.0_rc5+ from linus repo.
ToT => Top Of Tree. My apologies, I thought that was a commonly used acronym.
Guenter
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