linux-kernel - Re: [PATCH v2 2/3] platform/x86/intel/tpmi: Add debugfs interface

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Message-ID: <ZLApZqPhOpKGNyxI@smile.fi.intel.com>
Date:   Thu, 13 Jul 2023 19:42:14 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     hdegoede@...hat.com, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] platform/x86/intel/tpmi: Add debugfs interface

On Wed, Jul 12, 2023 at 04:06:50PM -0700, srinivas pandruvada wrote:
> On Wed, 2023-07-12 at 18:13 +0300, Andy Shevchenko wrote:
> > On Tue, Jul 11, 2023 at 03:09:48PM -0700, Srinivas Pandruvada wrote:

...

> > >  struct intel_tpmi_pm_feature {
> > >         struct intel_tpmi_pfs_entry pfs_header;
> > >         unsigned int vsec_offset;
> > > +       struct intel_vsec_device *vsec_dev;
> > 
> > Hmm... I don't know the layout of pfs_header, but this may be 4 bytes
> > less
> > if you move it upper.
> The pfs_header is packed with size of 64 bit. So size will not change.

So, it will be a gap of 4 bytes due to alignment, no?

> > >  };

...

> > > +       for (i = 0; i < tpmi_info->feature_count; ++i) {
> > 
> > Why preincrement?
> Does it matter for a "for" loop increment?

Stylewise. Preincrement raises a flag to the reader "what the heck is special
here that we need preincrement". If not required, I would use postincrement.

-- 
With Best Regards,
Andy Shevchenko