[PATCH 1/3] Add remove_memory() for ppc64

[Badari Pulavarty]

On Wed, 2007-10-31 at 13:45 -0700, Dave Hansen wrote:
> On Wed, 2007-10-31 at 08:49 -0800, Badari Pulavarty wrote:
> > +#ifdef CONFIG_MEMORY_HOTREMOVE
> > +int remove_memory(u64 start, u64 size)
> > +{
> > +	unsigned long start_pfn, end_pfn;
> > +	unsigned long timeout = 120 * HZ;
> > +	int ret;
> > +	start_pfn = start >> PAGE_SHIFT;
> > +	end_pfn = start_pfn + (size >> PAGE_SHIFT);
> > +	ret = offline_pages(start_pfn, end_pfn, timeout);
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(remove_memory);
> > +#endif /* CONFIG_MEMORY_HOTREMOVE */
> 
> Did someone go and copy the ia64 verion?  Tsk.  Tsk.  Bad Badari.  :)
> 
> Can we just make this a weak symbol in the generic mm/memory_hotplug.c?
> Or, make this the generic memory_remove() function int there and have an
> arch_remove_memory() hook called from there if the architectures need to
> tweak it?

Well, We don't need arch-specific remove_memory() for ia64 and ppc64.
x86_64, I don't know. We will know, only when some one does the
verification. I don't need arch_remove_memory() hook also at this time.

KAME and I agreed that, we will kill all this if no arch needs it (after
verifying it with x86/x86-64). No point adding all the infrastructure,
if no one needs it at the end.

Thanks,
Badari