linux-kernel - Re: [PATCH 03/14] cxl/mem: Find device capabilities

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Date:   Thu, 4 Feb 2021 07:16:46 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ben Widawsky <ben.widawsky@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-cxl@...r.kernel.org, Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Jon Masters <jcm@...masters.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        daniel.lll@...baba-inc.com,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>
Subject: Re: [PATCH 03/14] cxl/mem: Find device capabilities

On Wed, Feb 03, 2021 at 01:23:31PM -0800, Dan Williams wrote:
> > I'd prefer to keep the helpers for now as I do find them helpful, and so far
> > nobody else who has touched the code has complained. If you feel strongly, I
> > will change it.
> 
> After seeing the options, I think I'd prefer to not have to worry what
> extra magic is happening with cxl_read_mbox_reg32()
> 
> cxl_read_mbox_reg32(cxlm, CXLDEV_MB_CAPS_OFFSET);
> 
> readl(cxlm->mbox_regs + CXLDEV_MB_CAPS_OFFSET);
> 
> The latter is both shorter and more idiomatic.

Same here.  That being said I know some driver maintainers like
wrappers, my real main irk was the macro magic to generate them.