linux-kernel - Re: [Xen-devel] Re: [PATCH 8 of 13] Add a bootparameter to reserve high linear address space for hypervisors

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Date:	Wed, 2 Aug 2006 06:36:58 +0200
From:	Andi Kleen <ak@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...l.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <clameter@....com>
Subject: Re: [Xen-devel] Re: [PATCH 8 of 13] Add a bootparameter to reserve high linear address space for hypervisors

On Wednesday 02 August 2006 06:33, Rusty Russell wrote:
> On Wed, 2006-08-02 at 06:21 +0200, Andi Kleen wrote:
> > > 	I think you misunderstand the purpose of parse_early_param?  It is
> > > designed to be called directly by the arch at some point (it is
> > > idempotent, so the second call in init/main.c does nothing if the arch
> > > has called it).  ie. in i386, it replaces parse_cmdline_early().
> > 
> > Ah I didn't realize that. But why is there a second call in init/main.c?  
> > Looks like a big hack to me. Someone was too lazy to add it to all architectures?
> 
> Yes.  Someone == me.  I didn't want to hack it into all archs, I wanted
> archs to actually use it, and you can see that's not a trivial patch...
> 
> Once all archs use it, we can probably clean up setup_arch() not to take
> the char** and simply use the global saved_command_line directly.  At
> this rate, that'll be around 2012 8)

Please just make a proper patch - either add a call to it to all setup_archs,
or add a call to before setup_arch in init/main.c. While such ifdefs
for specific architecture hacks are more popular lately it doesn't mean they are a good idea.

I hope there aren't any existing architectures that use it in the middle
of setup_arch or rely on it being after setup_arch.

-Andi
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