linux-kernel - Re: [PATCH 10/15] cxl/acpi: Extract the RCH's RCRB base address from CEDT

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Date:   Thu, 1 Sep 2022 09:04:02 +0200
From:   Robert Richter <rrichter@....com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 10/15] cxl/acpi: Extract the RCH's RCRB base address from
 CEDT

On 31.08.22 12:09:09, Jonathan Cameron wrote:
> On Wed, 31 Aug 2022 10:15:58 +0200
> Robert Richter <rrichter@....com> wrote:

> >  static int __init cxl_restricted_host_probe(struct platform_device *pdev)
> >  {
> >  	struct pci_host_bridge *host = NULL;
> >  	struct acpi_device *adev;
> >  	unsigned long long uid = ~0;
> > +	resource_size_t rcrb;
> 
> Some of these could be made local to the while loop to reduce their scope.

I would need to move most of the vars into the loop then. So I rather
want to keep it as it is.

I also remember a compiler or code checker complaining about block
declaration, though it is in the c standard.

-Robert

> >  
> >  	while ((host = cxl_find_next_rch(host)) != NULL) {
> >  		adev = ACPI_COMPANION(&host->dev);
> > @@ -382,6 +419,12 @@ static int __init cxl_restricted_host_probe(struct platform_device *pdev)
> >  		if (uid > U32_MAX)
> >  			continue;
> >  
> > +		rcrb = cxl_get_rcrb(uid);
> > +		if (!rcrb)
> > +			continue;
> > +
> > +		dev_dbg(&host->dev, "RCRB found: 0x%08llx\n", (u64)rcrb);
> > +
> >  		dev_info(&host->dev, "host supports CXL\n");
> >  	}
> >  
>