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

From: Andi Kleen
Date: Wed Aug 02 2006 - 00:35:08 EST

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.

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