linux-kernel - Re: [PATCH 3/7] hwmon/coretemp: Handle large core id value

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Date:   Sun, 14 Aug 2022 01:07:14 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-hwmon@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        corbet@....net, fenghua.yu@...el.com, jdelvare@...e.com,
        linux@...ck-us.net, len.brown@...el.com
Subject: Re: [PATCH 3/7] hwmon/coretemp: Handle large core id value

On Sat, 2022-08-13 at 12:48 +0200, Ingo Molnar wrote:
> 
> * Zhang Rui <rui.zhang@...el.com> wrote:
> 
> > The coretemp driver supports up to a hard-coded limit of 128 cores.
> > 
> > Today, the driver can not support a core with an id above that
> > limit.
> > Yet, the encoding of core_id's is arbitrary (BIOS APIC-id) and so
> > they
> > may be sparse and they may be large.
> > 
> > Update the driver to map arbitrary core_id numbers into appropriate
> > array indexes so that 128 cores can be supported, no matter the
> > encoding
> > of core_ids's.
> 
> Please capitalize 'ID' consistently throughout the series.
> 
> > -       attr_no = pkg_flag ? PKG_SYSFS_ATTR_NO : TO_ATTR_NO(cpu);
> > +       if (pkg_flag)
> > +               attr_no = PKG_SYSFS_ATTR_NO;
> > +       else {
> > +               index = ida_alloc(&pdata->ida, GFP_KERNEL);
> > +               if (index < 0)
> > +                       return index;
> > +               pdata->cpu_map[index] = topology_core_id(cpu);
> > +               attr_no = index + BASE_SYSFS_ATTR_NO;
> > +       }
> 
> Unbalanced curly braces.

Sure, will fix these two issues in next version.

> 
> > -       int err, attr_no;
> > +       int err, index, attr_no;
> 
> So it's 'index' here.
> 
> > @@ -524,6 +538,8 @@ static void coretemp_remove_core(struct
> > platform_data *pdata, int indx)
> 
> But 'indx' here.
> 
> > -       int indx, target;
> > +       int i, indx = -1, target;
> 
> And 'indx' again. Did we run out of the letter 'e'? Either use
> 'index' 
> naming consistently, or 'idx' if it has to be abbreviated.

I'd prefer 'index', but here, this 'indx' is from previous code and
this patch just initializes it to -1.

thanks,
rui
> 
> Thanks,
> 
>         Ingo