linux-kernel - Re: [PATCH] staging: sm750fb: Fix sparse warning

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Date:	Tue, 10 Mar 2015 11:59:15 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Lorenzo Stoakes <lstoakes@...il.com>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	teddy.wang@...iconmotion.com, Greg KH <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: sm750fb: Fix sparse warning

On Tue, Mar 10, 2015 at 08:47:47AM +0000, Lorenzo Stoakes wrote:
> On 10 March 2015 at 07:00, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> 
> > No need for the volatile.
> 
> Will remove.
> 
> > Really mmio750 should be a "void __iomem *"
> > it is declared as "unsigned char __iomem *" but it's not a char pointer
> > that's only to make the pointer math work.  It would work just as well
> > as a void and we could remove some ugly casting.
> 
> I'm thinking the change to "void __iomem *" from "unsigned char
> __iomem *" ought to be a separate patch in order to keep this cleanly
> focused on solving the sparse warning? Am more than happy to do this
> and make the appropriate changes to the macros in ddk750_help.h.
> 

The patch is:

[patch] cleanup the type of mmio750

silencing a Sparse warning is just a side benifit of using correct
data types.  The "one thing per patch" rule also means that you should
fix a whole problem instead of half a thing per patch.

regards,
dan carpenter

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