linux-kernel - Re: compile time warnings

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Message-Id: <1230860380.5500.1.camel@brick>
Date:	Thu, 01 Jan 2009 17:39:40 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Tom Spink <tspink@...il.com>
Cc:	Jesper Juhl <jj@...osbits.net>, Ingo Brueckl <ib@...peronline.de>,
	linux-kernel@...r.kernel.org
Subject: Re: compile time warnings

On Fri, 2009-01-02 at 01:35 +0000, Tom Spink wrote:
> 2009/1/1 Jesper Juhl <jj@...osbits.net>:
> > On Thu, 1 Jan 2009, Ingo Brueckl wrote:
> [snip]
> 
> Hi,
> 
> > pgd_base is very much used...
> 
> It's probably something to do with:
> 
> # define permanent_kmaps_init(pgd_base)         do { } while (0)
> 
> Which is within the #else part of #if CONFIG_HIGHMEM.  So, if
> CONFIG_HIGHMEM is not set, permanent_kmaps_init gets wiped out, and
> therefore that warning will be issued.
> 
> Perhaps changing that to an empty inline would remove the warning?
> 

If it can be an inline, it should be, otherwise:

# define permanent_kmaps_init(pgd_base) do { (void)(pgd_base) } while (0)

would do the trick.

Harvey

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