linux-kernel - Re: [RFC PATCH 0/19] A kernel-level configfs enabled generic target engine for Linux v2.6.32

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Date:	Fri, 11 Sep 2009 20:08:04 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Hannes Reinecke <hare@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Joel Becker <joel.becker@...cle.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Florian Haas <florian.haas@...bit.com>,
	Philipp Reisner <philipp.reisner@...bit.com>
Subject: Re: [RFC PATCH 0/19] A kernel-level configfs enabled generic
	target engine for Linux v2.6.32

On Fri, 2009-09-11 at 19:37 -0700, Daniel Walker wrote:
> On Fri, 2009-09-11 at 18:55 -0700, Nicholas A. Bellinger wrote:
> > There is cleanup work continuing to make the TCM code to use
> > dprintk(),
> > and some include cleanups, and other minor fixes.  The code has also
> > been run through checkpatch again since the posting in April, and all
> > errors have been removed, with the exception of one ConfigFS macro
> > define triggering a checkpatch false positive.
> 

Greetings Daniel,

> 
> One show stopping issue is that your adding new semaphore usage in patch
> 5 and 16 (and in 16 it's a LOCKED one wtf!!). Which you should not be
> doing .. You need to really evaluate the warnings from checkpatch, cause
> those still have meaning.. 
> 

Ok, I will have a look at converting the HBA semaphore to a mutex in
patch 5, and use some single use waitqueues in patch 16.  Btw, the ones
using init_MUTEX_LOCKED() in the latter source file are being used when
shutting down target_core_mod allocated kernel threads to sychronize
between the stopping processing threads and configfs process context
that waitqueues would work better for.  Thanks for pointing this out!

> It's basically telling you what you should be doing in the warnings..
> For instance, don't add new semaphore usage, and it tells you what you
> need to be using in place of them..

Ok, so I will also do the struct sempahore -> struct mutex conversion
where it makes sense to protect lists and see about the rest..

>  Also typedefs are frowned upon, so
> you could remove those..
> 

I was thinking about going through the typedefs with a sed chainsaw, but
I decided against for this TCM patch series because it makes keeping
backward ports to <= v2.6.31 slightly easier to maintain for me for the
current users of LIO kernel code.

However, I have been starting to not use typedef for the newest ALUA and
pieces of PR code, and I would be happy to have another look at typedef
style comments on this once the other larger interest items are on the
way to being resolved.

Thanks!

--nab

> Daniel
> 
> --
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