linux-kernel - Re: [PATCH 1/1] PCI: Add hp_mmio_size and hp_mmio_pref

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Message-ID: <20191023100359.GW2819@lahna.fi.intel.com>
Date:   Wed, 23 Oct 2019 13:03:59 +0300
From:   "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "corbet@....net" <corbet@....net>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "logang@...tatee.com" <logang@...tatee.com>
Subject: Re: [PATCH 1/1] PCI: Add hp_mmio_size and hp_mmio_pref_size
 parameters

On Wed, Oct 23, 2019 at 09:57:17AM +0000, Nicholas Johnson wrote:
> On Wed, Oct 23, 2019 at 12:47:43PM +0300, mika.westerberg@...ux.intel.com wrote:
> > On Wed, Oct 23, 2019 at 08:37:48AM +0000, Nicholas Johnson wrote:
> > >  			} else if (!strncmp(str, "hpmemsize=", 10)) {
> > > -				pci_hotplug_mem_size = memparse(str + 10, &str);
> > > +				pci_hotplug_mmio_size =
> > > +					memparse(str + 10, &str);
> > > +				pci_hotplug_mmio_pref_size =
> > > +					memparse(str + 10, &str);
> > 
> > Does this actually work correctly? The first memparse(str + 10, &str)
> > modifies str so the next call will not start from the correct position
> > anymore.
> I have been using this for a long time now and have not had any issues.
> Does it modify str? I thought that was done by the loop.

If you add "hpmemsize=xxx" in the command line and print both
pci_hotplug_mmio_size and pci_hotplug_mmio_pref_size after the
assignment, do they have the same value? If yes, then there is no
problem.

> Can somebody else please weigh in here? I am worried now, and I want to 
> be sure. If it is a problem, then I will have to read it into 
> pci_hotplug_mmio_size and then set:
> 
> pci_hotplug_mmio_pref_size = pci_hotplug_mmio_size

Yup.