From: Dan Williams <dan.j.williams@intel.com>
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Ben Widawsky <ben.widawsky@intel.com>,
linux-cxl@vger.kernel.org,
Linux ACPI <linux-acpi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Linux PCI <linux-pci@vger.kernel.org>,
Bjorn Helgaas <helgaas@kernel.org>,
"Chris Browy <cbrowy@avery-design.com>,
Christoph Hellwig <hch@infradead.org>,
Dan Williams <dan.j.williams@intel.com>,
David Hildenbrand <david@redhat.com>,
David Rientjes" <rientjes@google.com>,
"Jon Masters <jcm@jonmasters.org>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Randy Dunlap" <rdunlap@infradead.org>,
"John Groves (jgroves)" <jgroves@micron.com>,
"Kelley, Sean V" <sean.v.kelley@intel.com>,
kernel test robot <lkp@intel.com>,
Dan Williams <dan.j.willams@intel.com>
Subject: Re: [PATCH v2 4/8] cxl/mem: Add basic IOCTL interface
Date: Wed, 10 Feb 2021 20:40:52 -0800 [thread overview]
Message-ID: <CAPcyv4hRUB3jxdCV06y0kYMbKbGroEW6F9yOQ4KB_z6YgWBZ4Q@mail.gmail.com> (raw)
In-Reply-To: <20210210184540.00007536@Huawei.com>
On Wed, Feb 10, 2021 at 10:47 AM Jonathan Cameron
<Jonathan.Cameron@huawei.com> wrote:
[..]
> > +#define CXL_CMDS \
> > + ___C(INVALID, "Invalid Command"), \
> > + ___C(IDENTIFY, "Identify Command"), \
> > + ___C(MAX, "Last command")
> > +
> > +#define ___C(a, b) CXL_MEM_COMMAND_ID_##a
> > +enum { CXL_CMDS };
> > +
> > +#undef ___C
> > +#define ___C(a, b) { b }
> > +static const struct {
> > + const char *name;
> > +} cxl_command_names[] = { CXL_CMDS };
> > +#undef ___C
>
> Unless there are going to be a lot of these, I'd just write them out long hand
> as much more readable than the macro magic.
This macro magic isn't new to Linux it was introduced with ftrace:
See "cpp tricks and treats": https://lwn.net/Articles/383362/
>
> enum {
> CXL_MEM_COMMAND_ID_INVALID,
> CXL_MEM_COMMAND_ID_IDENTIFY,
> CXL_MEM_COMMAND_ID_MAX
> };
>
> static const struct {
> const char *name;
> } cxl_command_names[] = {
> [CXL_MEM_COMMAND_ID_INVALID] = { "Invalid Command" },
> [CXL_MEM_COMMAND_ID_IDENTIFY] = { "Identify Comamnd" },
> /* I hope you never need the Last command to exist in here as that sounds like a bug */
> };
>
> That's assuming I actually figured the macro fun out correctly.
> To my mind it's worth doing this stuff for 'lots' no so much for 3.
The list will continue to expand, and it eliminates the "did you
remember to update cxl_command_names" review burden permanently.
next prev parent reply other threads:[~2021-02-11 4:42 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 0:02 [PATCH v2 0/8] CXL 2.0 Support Ben Widawsky
2021-02-10 0:02 ` [PATCH v2 1/8] cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints Ben Widawsky
2021-02-10 16:17 ` Jonathan Cameron
2021-02-10 17:12 ` Ben Widawsky
2021-02-10 17:23 ` Jonathan Cameron
2021-02-10 0:02 ` [PATCH v2 2/8] cxl/mem: Find device capabilities Ben Widawsky
2021-02-10 13:32 ` Jonathan Cameron
2021-02-10 15:07 ` Jonathan Cameron
2021-02-10 16:55 ` Ben Widawsky
2021-02-10 17:30 ` Jonathan Cameron
2021-02-10 18:16 ` Ben Widawsky
2021-02-11 9:55 ` Jonathan Cameron
2021-02-11 15:55 ` Ben Widawsky
2021-02-12 13:27 ` Jonathan Cameron
2021-02-12 15:54 ` Ben Widawsky
2021-02-11 18:27 ` Ben Widawsky
2021-02-12 13:23 ` Jonathan Cameron
2021-02-10 19:32 ` Ben Widawsky
2021-02-10 17:41 ` Jonathan Cameron
2021-02-10 18:53 ` Ben Widawsky
2021-02-10 19:54 ` Dan Williams
2021-02-11 10:01 ` Jonathan Cameron
2021-02-11 16:04 ` Ben Widawsky
2021-02-10 0:02 ` [PATCH v2 3/8] cxl/mem: Register CXL memX devices Ben Widawsky
2021-02-10 18:17 ` Jonathan Cameron
2021-02-11 10:17 ` Jonathan Cameron
2021-02-11 20:40 ` Dan Williams
2021-02-12 13:33 ` Jonathan Cameron
2021-02-10 0:02 ` [PATCH v2 4/8] cxl/mem: Add basic IOCTL interface Ben Widawsky
2021-02-10 18:45 ` Jonathan Cameron
2021-02-10 20:22 ` Ben Widawsky
2021-02-11 4:40 ` Dan Williams [this message]
2021-02-11 10:06 ` Jonathan Cameron
2021-02-11 16:54 ` Ben Widawsky
2021-02-14 16:30 ` Al Viro
2021-02-14 23:14 ` Ben Widawsky
2021-02-14 23:50 ` Al Viro
2021-02-14 23:57 ` Al Viro
2021-02-10 0:02 ` [PATCH v2 5/8] cxl/mem: Add a "RAW" send command Ben Widawsky
2021-02-10 15:26 ` Ariel.Sibley
2021-02-10 16:49 ` Ben Widawsky
2021-02-10 18:03 ` Ariel.Sibley
2021-02-10 18:11 ` Ben Widawsky
2021-02-10 18:46 ` Ariel.Sibley
2021-02-10 19:12 ` Ben Widawsky
2021-02-11 16:43 ` Dan Williams
2021-02-11 11:19 ` Jonathan Cameron
2021-02-11 16:01 ` Ben Widawsky
2021-02-12 13:40 ` Jonathan Cameron
2021-02-10 0:02 ` [PATCH v2 6/8] cxl/mem: Enable commands via CEL Ben Widawsky
2021-02-11 12:02 ` Jonathan Cameron
2021-02-11 17:45 ` Ben Widawsky
2021-02-11 20:34 ` Dan Williams
2021-02-16 13:43 ` Bartosz Golaszewski
2021-02-10 0:02 ` [PATCH v2 7/8] cxl/mem: Add set of informational commands Ben Widawsky
2021-02-11 12:07 ` Jonathan Cameron
2021-02-10 0:02 ` [PATCH v2 8/8] MAINTAINERS: Add maintainers of the CXL driver Ben Widawsky
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