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

Andi Kleen
2006-08-01T21:48:06Z

> + /*
> + * reservedtop=size reserves a hole at the top of the kernel
> + * address space which a hypervisor can load into later.
> + * Needed for dynamically loaded hypervisors, so relocating
> + * the fixmap can be done before paging initialization.
> + * This hole must be a multiple of 4M.
> + */
> + else if (!memcmp(from, "reservedtop=", 12)) {
> + unsigned long reserved = memparse(from+12, &from);
> + reserved &= ~0x3fffff;
> + set_fixaddr_top(-reserved);
> + }

You need to add a dummy __setup for it, otherwise it will end up in
init's environments or be warned about.

Also it should be documented somewhere in Documentation

-Andi