linux-kernel - Re: [PATCH 5/7] x86/PCI: print resources consistently with %pRt

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Date:	Sat, 10 Oct 2009 09:36:40 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Len Brown <lenb@...nel.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 5/7] x86/PCI: print resources consistently with %pRt

On Fri, 2009-10-09 at 17:14 -0400, Len Brown wrote:
> > The message changes like this:
> > 
> >   -PCI: Failed to allocate to allocate 0x0-0x3fff from PCI IO for PCI Bus 0000:00
> >   +pci_root PNP0A03:01: can't allocate [io  0x0000-0x3fff]
> > 
> > I don't think changing "PCI IO" to "io" is really a problem.  In fact,
> > strictly speaking, "PCI IO" is the wrong name for ioport_resource --
> > we're talking about a host bridge, and the upstream side is not PCI
> > at all.
> > 
> > However, I do think it would be more useful to mention the fact that
> > we failed to allocate a *window*, e.g., 
> > 
> >   pci_root PNP0A03:00: can't allocate host bridge window [io  0x0000-0x3fff]
> > 
> > I did consider keeping the PCI bus ("0000:00"), but I decided we
> > already have that information here:
> > 
> >   ACPI: PCI Root Bridge [PCI0] (0000:00)
> > 
> > and it doesn't seem worthwhile to me to repeat the bus number in all
> > the host bridge-related messages.  Right now, there's nothing to tie
> > the PCI0 to the PNP0A03:00 (and "PCI0" shouldn't be exposed to users
> > anyway), but someday when I finally convince Len to use dev_printk
> > in ACPI, it could look something like this:
> > 
> >   pci_root PNP0A03:00: PCI host bridge to pci_bus 0000:00
> 
> The last time we looked at using dev_printk() in ACPI,
> it looked like the leading ACPI: would go away, and the
> concern was that would hinder, rather than help, people
> in reporting issues to the right place.
> 
> I have no problem with using dev_printk() where it makes sense,
> but only if it makes the message more useful rather than
> less useful.

Yes, I'm sorry, that was kind of a low blow that didn't represent your
concerns fairly.

> BTW. I like the consistency provided by the series at hand.
> I assume that it will go through Jesse's, and for that,
> consider the relevant bits...
> 
> Acked-by: Len Brown <len.brown@...el.com>

Thanks.  I'm planning to post an updated series soon.  Joe Perches
suggested reducing the stack usage in vsprintf, so I'm working on that,
and I might add another message or two.

Bjorn


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