linux-kernel - Re: [PATCH ] Staging: hv: Hyper-V driver cleanup

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Message-ID: <20110225003136.GA27272@suse.de>
Date:	Thu, 24 Feb 2011 16:31:36 -0800
From:	Greg KH <gregkh@...e.de>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH ] Staging: hv:  Hyper-V driver cleanup

On Fri, Feb 25, 2011 at 12:24:57AM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH [mailto:gregkh@...e.de]
> > Sent: Thursday, February 24, 2011 6:46 PM
> > To: KY Srinivasan
> > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> > virtualization@...ts.osdl.org; Haiyang Zhang; Hank Janssen
> > Subject: Re: [PATCH ] Staging: hv: Hyper-V driver cleanup
> > 
> > On Thu, Feb 24, 2011 at 03:20:58PM -0800, K. Y. Srinivasan wrote:
> > > This patch cleans up (a lot of the) naming issues that
> > > various reviewers have noted. It also gets rid of
> > > some unnecessary layering in the code.
> > 
> > Whenever you have a patch description that says "It also..." you know
> > you need to break this up into smaller, logical pieces.
> 
> The name change was related to the layering issue. For instance I combined the 
> Vm_device and hv_device abstractions to build the hyperv_device abstraction.
> Likewise, I combined the driver_context and the hv_driver abstractions to build the 
> the hyperv_driver abstraction. Would breaking this patch up into two patches,
> one dealing with the device abstraction consolidation and the other dealing with
> the consolidation of driver abstractions satisfy your concern. Even if I partition this 
> patch along these lines, it will still be a large set of patches; since these changes 
> are pervasive. 

pervasive patches are fine, just remember, "each patch can only do one
thing".  It sounds like you want to do at least 2 patches here, if not
a lot more.  Look at my past patches when I combined things and removed
a whole layer for how to do this in a very incremental, piece-by-piece
fashion (i.e, move one field over at a time until the structure is gone,
and then remove it entirely.)

> > There is no 2.6.38 kernel yet, so I find this very hard to believe :)
> 
> My mistake; I did not specify the full output of uname -a on the box 
> that I tested this code. This box is running the LINUX-NEXT kernel :
> 2.6.38-rc1-0.2-default.

linux-next should be farther along than -rc1 as -rc6 is currently out.

confused,

greg k-h
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