linux-kernel - Re: [PATCH 1/1] PCI: Convert pdev_sort_resources() to use resource name helper

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Message-ID: <fc0649b5-d065-2627-f475-d61f0594d0e5@linux.intel.com>
Date: Wed, 16 Oct 2024 16:15:43 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Philipp Stanner <pstanner@...hat.com>
cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] PCI: Convert pdev_sort_resources() to use resource
 name helper

On Wed, 16 Oct 2024, Philipp Stanner wrote:

> On Wed, 2024-10-16 at 15:00 +0300, Ilpo Järvinen wrote:
> > Use pci_resource_name() helper in pdev_sort_resources() to print
> > resources in user-friendly format.
> > 
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > ---
> >  drivers/pci/setup-bus.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> > index 23082bc0ca37..071c5436b4a5 100644
> > --- a/drivers/pci/setup-bus.c
> > +++ b/drivers/pci/setup-bus.c
> > @@ -134,6 +134,7 @@ static void pdev_sort_resources(struct pci_dev
> > *dev, struct list_head *head)
> >  	int i;
> >  
> >  	pci_dev_for_each_resource(dev, r, i) {
> > +		const char *r_name = pci_resource_name(dev, i);
> >  		struct pci_dev_resource *dev_res, *tmp;
> >  		resource_size_t r_align;
> >  		struct list_head *n;
> > @@ -146,8 +147,8 @@ static void pdev_sort_resources(struct pci_dev
> > *dev, struct list_head *head)
> >  
> >  		r_align = pci_resource_alignment(dev, r);
> >  		if (!r_align) {
> > -			pci_warn(dev, "BAR %d: %pR has bogus
> > alignment\n",
> > -				 i, r);
> > +			pci_warn(dev, "%s: %pR has bogus
> > alignment\n",
> > +				 r_name, r);
> 
> Why do you remove the BAR index number, don't you think this
> information is also useful?

That's because of how pci_resource_name() works. The number will be 
included in the returned string and it won't be always same as i.
So that change is done on purpose.

> One could also consider printing r_align, would that be useful?

As per the preceeding condition, it's known to be zero so it's not 
that useful for any developer looking at these code lines.

> Note
> that there is a similar pci_warn down below in line 1118 that does
> print it. Would you want to change that pci_warn()-string, too?

pci_warn() on line 1118 does NOT print i (as expected when using 
pci_resource_name()) and there align is not zero so I don't see how this 
is relevant.

But thanks for taking a look anyway. :-)

-- 
 i.