linux-kernel - Re: [PATCH] PCI/AER: correctable error message as KERN

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Message-ID: <CANEJEGuQhPHG6517=Os_9cgzhx7r0Rivg8BRAnKdENPMvNFxKQ@mail.gmail.com>
Date:   Wed, 8 Mar 2023 12:23:12 -0800
From:   Grant Grundler <grundler@...omium.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Grant Grundler <grundler@...omium.org>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        "Oliver O 'Halloran" <oohall@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rajat Khandelwal <rajat.khandelwal@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rajat Jain <rajatja@...omium.org>
Subject: Re: [PATCH] PCI/AER: correctable error message as KERN_INFO

On Wed, Mar 8, 2023 at 12:18 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> On Wed, Mar 08, 2023 at 12:00:48PM -0800, Grant Grundler wrote:
> > Ping? Did I miss an email or other work that this patch collides with?
>
> Nope, we typically make topic branches based on -rc1, so not much
> happens during the merge window.  -rc1 was tagged Sunday, so things
> will start appearing in -next soon.

Ah ok! Thanks for clarifying Bjorn!

cheers,
grant

>
> Bjorn
>
> > On Tue, Feb 28, 2023 at 10:05 PM Grant Grundler <grundler@...omium.org> wrote:
> > >
> > > Since correctable errors have been corrected (and counted), the dmesg output
> > > should not be reported as a warning, but rather as "informational".
> > >
> > > Otherwise, using a certain well known vendor's PCIe parts in a USB4 docking
> > > station, the dmesg buffer can be spammed with correctable errors, 717 bytes
> > > per instance, potentially many MB per day.
> > >
> > > Given the "WARN" priority, these messages have already confused the typical
> > > user that stumbles across them, support staff (triaging feedback reports),
> > > and more than a few linux kernel devs. Changing to INFO will hide these
> > > messages from most audiences.
> > >
> > > Signed-off-by: Grant Grundler <grundler@...omium.org>
> > > ---
> > > This patch will likely conflict with:
> > >   https://lore.kernel.org/all/20230103165548.570377-1-rajat.khandelwal@linux.intel.com/
> > >
> > > which I'd also like to see upstream. Please let me know to resubmit mine if Rajat's patch lands first. Or feel free to fix up this one.
> > >
> > >  drivers/pci/pcie/aer.c | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> > > index f6c24ded134c..e4cf3ec40d66 100644
> > > --- a/drivers/pci/pcie/aer.c
> > > +++ b/drivers/pci/pcie/aer.c
> > > @@ -692,7 +692,7 @@ static void __aer_print_error(struct pci_dev *dev,
> > >
> > >         if (info->severity == AER_CORRECTABLE) {
> > >                 strings = aer_correctable_error_string;
> > > -               level = KERN_WARNING;
> > > +               level = KERN_INFO;
> > >         } else {
> > >                 strings = aer_uncorrectable_error_string;
> > >                 level = KERN_ERR;
> > > @@ -724,7 +724,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
> > >         layer = AER_GET_LAYER_ERROR(info->severity, info->status);
> > >         agent = AER_GET_AGENT(info->severity, info->status);
> > >
> > > -       level = (info->severity == AER_CORRECTABLE) ? KERN_WARNING : KERN_ERR;
> > > +       level = (info->severity == AER_CORRECTABLE) ? KERN_INFO : KERN_ERR;
> > >
> > >         pci_printk(level, dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n",
> > >                    aer_error_severity_string[info->severity],
> > > --
> > > 2.39.2.722.g9855ee24e9-goog
> > >