linux-kernel - Re: hwmon: (coretemp) Simplify package management

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Date:   Wed, 28 Dec 2016 16:55:14 -0500
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: hwmon: (coretemp) Simplify package management

On Wed, Dec 14, 2016 at 12:58:38AM +0000, Linux Kernel wrote:
 > Web:        https://git.kernel.org/torvalds/c/712668460594294d74c13f2a023398a597fbe95f
 > Commit:     712668460594294d74c13f2a023398a597fbe95f
 > Parent:     2195c31b127def509c806fe8a9d3b4092a28ce31
 > Refname:    refs/heads/master
 > Author:     Thomas Gleixner <tglx@...utronix.de>
 > AuthorDate: Tue Nov 22 17:42:06 2016 +0000
 > Committer:  Guenter Roeck <linux@...ck-us.net>
 > CommitDate: Fri Dec 9 21:54:13 2016 -0800
 > 
 >     hwmon: (coretemp) Simplify package management
 >     
 >     Keeping track of the per package platform devices requires an extra object,
 >     which is held in a linked list.
 >     
 >     The maximum number of packages is known at init() time. So the extra object
 >     and linked list management can be replaced by an array of platform device
 >     pointers in which the per package devices pointers can be stored. Lookup
 >     becomes a simple array lookup instead of a list walk.
 >     
 >     The mutex protecting the list can be removed as well because the array is
 >     only accessed from cpu hotplug callbacks which are already serialized.
 >     
 >     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
 >     Signed-off-by: Guenter Roeck <linux@...ck-us.net>


 >  1 file changed, 38 insertions(+), 82 deletions(-)
 > 
 > diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
 > index c364bfd..3ac4c03 100644
 > --- a/drivers/hwmon/coretemp.c
 > +++ b/drivers/hwmon/coretemp.c
 > @@ -127,7 +122,7 @@ static ssize_t show_label(struct device *dev,
 >  	struct temp_data *tdata = pdata->core_data[attr->index];
 >  
 >  	if (tdata->is_pkg_data)
 > -		return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
 > +		return sprintf(buf, "Package id %u\n", pdata->pkg_id);
 >  
 >  	return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
 >  }


This is breakage of a userspace ABI. 
Fixing up my mrtg config to cope was simple enough, but do we want to
force everyone to have to do that if they upgrade their kernel ?

	Dave