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Message-ID: <20220302201600.GA746065@bhelgaas>
Date:   Wed, 2 Mar 2022 14:16:00 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>
Cc:     �念��/TV S/W Lab(VD)/Staff Engineer/�Z���� <yj84.jang@...sung.com>,
        "'Rafael J. Wysocki'" <rafael@...nel.org>,
        'Pavel Machek' <pavel@....cz>,
        'Len Brown' <len.brown@...el.com>,
        'Bjorn Helgaas' <bhelgaas@...gle.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-usb@...r.kernel.org, js07.lee@...sung.com
Subject: Re: [PATCH] PM: Add device name to suspend_report_result()

On Wed, Mar 02, 2022 at 03:52:51PM +0100, 'Greg Kroah-Hartman' wrote:
> On Wed, Mar 02, 2022 at 08:00:14PM +0900, �念��/TV S/W Lab(VD)/Staff Engineer/�Z���� wrote:
> > > -----Original Message-----
> > > From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > Sent: Wednesday, March 2, 2022 4:58 PM
> > > To: Youngjin Jang <yj84.jang@...sung.com>
> > > Cc: Rafael J. Wysocki <rafael@...nel.org>; Pavel Machek <pavel@....cz>;
> > > Len Brown <len.brown@...el.com>; Bjorn Helgaas <bhelgaas@...gle.com>;
> > > linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> > > pci@...r.kernel.org; linux-acpi@...r.kernel.org; linux-
> > usb@...r.kernel.org;
> > > js07.lee@...sung.com
> > > Subject: Re: [PATCH] PM: Add device name to suspend_report_result()
> > > 
> > > On Wed, Mar 02, 2022 at 03:49:17PM +0900, Youngjin Jang wrote:
> > > > From: "yj84.jang" <yj84.jang@...sung.com>
> > > >
> > > > currently, suspend_report_result() prints only function information.
> > > > If any driver uses common pm function, nobody knows who called failed
> > > > function exactly.
> > > >
> > > > So, device information is needed to recognize specific wrong driver.
> > > >
> > > > e.g.)
> > > > PM: dpm_run_callback(): pm_generic_suspend+0x0/0x48 returns 0
> > > > PM: dpm_run_callback(): platform_pm_suspend+0x0/0x68 returns 0 after
> > > > patch,
> > > > PM: dpm_run_callback(): pm_generic_suspend+0x0/0x48 (amba) returns 0
> > > > PM: dpm_run_callback(): platform_pm_suspend+0x0/0x68 (armv7-pmu)
> > > > returns 0

> > > > -		pr_err("%s(): %pS returns %d\n", function, fn, ret);
> > > > +		pr_err("%s(): %pS (%s) returns %d\n", function, fn,
> > > > +dev_driver_string(dev), ret);
> > > 
> > > If you have a struct device, please use dev_err().
> > 
> > I think dev_err() is nice option, but we can see a minor issue.
> > Prefix log "PM: " would be lost, If I use dev_err() in this context.
> > As you know, all logs in power management include "PM :" prefix.
> 
> Why does that matter?  Fix them all to use the struct device pointer and
> then they will be properly unified with the rest of the kernel log
> infrastructure.

You can #define dev_fmt if you need a prefix.

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