linux-kernel - Re: [PATCH 2/2] xhci: Rename SEGMENT_SIZE and SEGMENT

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Date:	Thu, 28 Mar 2013 17:10:48 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] xhci: Rename SEGMENT_SIZE and SEGMENT_SHIFT as the
 former is used in a.out.h

On Thu, Mar 28, 2013 at 10:32:53PM +0000, David Howells wrote:
> Sarah Sharp <sarah.a.sharp@...ux.intel.com> wrote:
> 
> > I'm a little bit confused about your description for the second one.
> > Did you need to change the #defines names because they could conflict
> > with other drivers when the xHCI driver is built in?  Or is there some
> > other point I'm missing?
> 
> Sorry, I should say.  I'm trying to clean up the UAPI headers and I noticed
> that the xHCI SEGMENT_SIZE macro is named the same as one defined by a.out.h
> that cannot be changed as it is seen by userspace.  Although it's unlikely
> that within the kernel they are unlikely to collide, one cannot be entirely
> sure that will stay true as new arches get added (hopefully no one will add
> new arches that use a.out format).  It seems best that the xHCI one be renamed
> if possible.

I guess my question is a deeper one: do we need to rename all the xHCI
macros to have the XHCI_ prefix, in order to avoid future collision?
For example, one of the macros is MAX_HC_PORTS, which could possibly be
used by other host drivers in the future.

Note that I'm not asking you to do this, just if it needs to be done.

Sarah Sharp
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