linux-kernel - Re: [UPDATE][PATCH] platform/x86/intel-uncore-freq: Conditionally create attribute for read frequency

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Message-ID: <b7fd5b52-9d91-cfe-e011-522160947115@linux.intel.com>
Date:   Wed, 4 Oct 2023 12:46:49 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [UPDATE][PATCH] platform/x86/intel-uncore-freq: Conditionally
 create attribute for read frequency

On Tue, 3 Oct 2023, srinivas pandruvada wrote:
> On Tue, 2023-10-03 at 16:10 +0300, Ilpo Järvinen wrote:
> > On Mon, 2 Oct 2023, Srinivas Pandruvada wrote:
> > 
> > > When the current uncore frequency can't be read, don't create
> > > attribute
> > > "current_freq_khz" as any read will fail later. Some user space
> > > applications like turbostat fail to continue with the failure. So,
> > > check
> > > error during attribute creation.
> > > 
> > > Fixes: 8a54e2253e4c ("platform/x86/intel-uncore-freq: Uncore
> > > frequency control via TPMI")
> > 
> > Hi,
> > 
> > Thanks for the update but that commit id looks bogus, or where the
> > value 
> > is used w/o error check?
> 
> commit 8a54e2253e4c25e5b61c9a9bee157bb52da5d432
> Author: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Date:   Thu Apr 20 15:05:14 2023 -0700
> 
>     platform/x86/intel-uncore-freq: Uncore frequency control via TPMI
> 
> 
> This is the commit exposed the issue. This is not the commit which
> changed the code in question. 
> 
> 
> I can add also
> Fixes: dbce412a7733 ("platform/x86/intel-uncore-freq: Split common and
> enumeration part")
> 
> But the change even before that as this commit just reorganized code
> but because of change of folders, that will look like correct commit.

I never thought dbce412a7733 is being fixed here, it's just a refactor 
moving code around like you say.

But how about 414eef27283a ("platform/x86/intel/uncore-freq: Display 
uncore current frequency") which actually adds the code line you're now 
fixing. What was broken before it? All I see is the one call in
show_perf_status_freq_khz() but that's checking for errors.

-- 
 i.