linux-kernel - Re: [PATCH v3 3/9] cxl/mem: Register CXL memX devices

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Date:   Mon, 15 Feb 2021 08:30:14 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ben Widawsky <ben.widawsky@...el.com>
Cc:     linux-cxl@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.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>,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>
Subject: Re: [PATCH v3 3/9] cxl/mem: Register CXL memX devices

On Fri, Feb 12, 2021 at 02:25:35PM -0800, Ben Widawsky wrote:
> From: Dan Williams <dan.j.williams@...el.com>
> 
> Create the /sys/bus/cxl hierarchy to enumerate:
> 
> * Memory Devices (per-endpoint control devices)
> 
> * Memory Address Space Devices (platform address ranges with
>   interleaving, performance, and persistence attributes)
> 
> * Memory Regions (active provisioned memory from an address space device
>   that is in use as System RAM or delegated to libnvdimm as Persistent
>   Memory regions).
> 
> For now, only the per-endpoint control devices are registered on the
> 'cxl' bus. However, going forward it will provide a mechanism to
> coordinate cross-device interleave.
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com> (v2)

arm:allmodconfig, i386:allyesconfig, mips:allmodconfig:

drivers/cxl/mem.c:335:2: error: implicit declaration of function 'writeq'; did you mean 'writel'? [-Werror=implicit-function-declaration]
  335 |  writeq(cmd_reg, cxlm->mbox_regs + CXLDEV_MBOX_CMD_OFFSET);

In file included from <command-line>:
drivers/cxl/mem.c: In function '__cxl_mem_mbox_send_cmd':
include/linux/compiler_types.h:320:38: error: call to '__compiletime_assert_266' declared with attribute error: FIELD_GET: mask is zero

and many similar errors.

Guenter