linux-kernel - Re: [PATCH 0/3] New firewire stack

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Date:	Sun, 10 Dec 2006 13:57:19 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Kristian Høgsberg <krh@...planet.net>
CC:	linux1394-devel@...ts.sourceforge.net,
	Kristian H?gsberg <krh@...hat.com>,
	Erik Mouw <erik@...ddisk-recovery.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] New firewire stack

Kristian Høgsberg wrote:
> On 12/8/06, Stefan Richter <stefanr@...6.in-berlin.de> wrote:
...
>>>> On Tue, Dec 05, 2006 at 10:13:55AM -0500, Kristian H?gsberg wrote:
>>>>> Marcel Holtmann wrote:
>>>>>> can you please use drivers/firewire/ if you want to start clean or
>>>>>> aiming at replacing drivers/ieee1394/. Using "fw" as an abbreviation in
>>>>>> the directory path is not really helpful.
>>>>>
>>>>> Yes, that's probably a better idea.  Do you see a problem with using fw_*
>>>>> as a prefix in the code though?  I don't see anybody using that prefix, but
>>>>> Stefan pointed out to me that it's often used to abbreviate firmware too.
[...]
> I'm not changing it just yet, but I'm not too attached to fw_
> and I think that ieee1394_ will work better.  The modutil tools
> already use ieee1394 for device_id tables.
[...]

Alas the length of "ieee1394_" gets in the way of readability.


There are currently no exported symbols starting with "fw_":

linux-2.6.19 $ find . -type f -exec grep -e 'EXPORT.*fw_' {} \;
EXPORT_SYMBOL(iop_fw_load_spu);
EXPORT_SYMBOL(iop_fw_load_mpu);
EXPORT_SYMBOL(hostap_check_sta_fw_version);
EXPORT_SYMBOL(mpt_alloc_fw_memory);
EXPORT_SYMBOL(mpt_free_fw_memory);


There are a few names of struct members starting with "fw_" and four
global variables on the MIPS architecture:

linux-2.6.19 $ find include/ -type f -exec grep -e '[ ]fw_' {} \;
        __u64 fw_ver;
            unsigned char fw_mpx_cap; /* forward multiplexing capability */
        unsigned long fw_vendor;        /* physical addr of CHAR16 vendor string */
        u32 fw_revision;
        int             fw_rev[MAX_BOARD];
        char fw_version[2];                /* major = [0], minor = [1] */
        u64 fw_flags;
extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
linux-2.6.19 $ find include/ -type f -exec grep -l '[ ]fw_' {} \;
include/rdma/ib_user_verbs.h
include/linux/atmsap.h
include/linux/efi.h
include/linux/cyclades.h
include/sound/snd_wavefront.h
include/asm-alpha/gct.h
include/asm-mips/bootinfo.h


There are a few constants starting with "FW_":

linux-2.6.19 $ find include/ -type f -exec grep -e '[ ]FW_' {} \;|wc -l
38
linux-2.6.19 $ find include/ -type f -exec grep -l '[ ]FW_' {} \;
include/linux/firmware.h
include/video/radeon.h
include/asm-powerpc/pmac_feature.h
include/asm-powerpc/firmware.h
include/asm-ppc/residual.h


Since cross-subsystem drivers like sbp2 (a SCSI driver) and eth1394 (a
networking driver) live in linux/drivers/ieee1394/, the IEEE 1394 subsystem
does not need to ship header files in linux/include/, except for the minimum
stuff in linux/include/linux/mod_devicetable.h. Therefore the only conflicts
that the IEEE 1394 subsystem code could create would be via its EXPORTs.

I would therefore prefer "fw_" or "hpsb_" over any of the other suggestions
made here:
  - ieee1394_ makes sense in linux/mod_devicetable.h but is too long
    otherwise.
  - fiwi_, frwr_, and fwire_ are artificial abbreviations which come very
    unnatural. (fw_ is an artificial abbreviation too but is not as awkward
    as the others. hpsb_ is not just an abbreviation, it is an established
    acronym of the canonical name of the bus.)

-- 
Stefan Richter
-=====-=-==- ==-- -=-=-
http://arcgraph.de/sr/
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