Re: [PATCH 1/2] PCI: Prevent 64-bit resources from being counted in 32-bit bridge region

From: Bjorn Helgaas
Date: Mon Mar 04 2019 - 15:12:20 EST

On Mon, Mar 4, 2019 at 1:21 PM Logan Gunthorpe <logang@xxxxxxxxxxxx> wrote:
> On 2019-03-03 5:23 p.m., Bjorn Helgaas wrote:
> > Sorry for the delay. This code gives a headache. I still remember
> > my headache from the last time we touched it. Help me understand
> > what's going on here.
> Yes, this code gave me a headache debugging it too. And it's not the
> first time I've tried to figure out what's going on with it because it
> often just prints noisy messages that look like errors. I think I
> understand it better now but it's something that's a bit fleeting and
> easy to forget the details of. There may also be other solutions to this
> problem.

Thanks for the explanation below. I haven't worked through it yet, but I will.

Obviously it would be far better than an explanation if we could
simplify the code (and the noisy messages) such that it didn't
*require* so much explanation.