linux-kernel - Re: [RFC PATCH] SCSI host lock push-down

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Date:	Sun, 07 Nov 2010 11:54:22 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] SCSI host lock push-down

On 11/06/2010 05:31 AM, Stefan Richter wrote:
> Jeff Garzik wrote:
>> An alternate arrangement, not presented by this patch, might
>> be preferred:  in order to make it clear that queuecommand
>> locking has changed, one could s/queuecommand/queuecommand_nl/ in
>> Scsi_Host_Template, in order to guarantee that drivers are either
>> (a) upgraded or (b) broken at compile time.  Compile-time detection of
>> new locking may be desirable, and I'll volunteer to change my patch to
>> do that, if community members prefer that route instead of below.
>
> I followed only a fraction of the related discussion.  Thus I wonder why a
> renaming of scsi_host_template.queuecommand was not part of these attempts
> from the very outset.
>
> Given the choice between compile-time breakage of unconverted drivers and
> silent invalidation of potential locking assumptions at runtime, the
> preferable way forward is quite clear IMO.

I am leaning towards a rename, but wanted to see what others thought.


> (Since no coexistence period of .queuecommand and .queuecommand_nl or
> .unlocked_queuecommand is planned, how about you rename it to .queue_command?
> Follows Linux naming conventions more closely.)

To me, that name lacks a clear "locking changed" signal, for a random 
engineer who simply stumbles upon the queuecommand -> queue_command 
rename change one day.

	Jeff


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