Re: kexec reboot code buffer

[ebiederm@xmission.com (Eric W. Biederman)]

William Lee Irwin III <wli@holomorphy.com> writes:

> William Lee Irwin III <wli@holomorphy.com> writes:
> >> Seriously, just plop down the fresh zone type and all will be well.
> >> It's really incredibly easy.
> 
> On Tue, Jan 28, 2003 at 12:28:04AM -0700, Eric W. Biederman wrote:
> > I will certainly take a look, tracing through that code can get a little
> > hairy.
> 
> It can really be approached much more cavalierly than that. The only
> extant example aside from the original ZONE_DMA32 implementation I've
> seen is Simon Winwood's MPSS patch, which needed something on the order
> of 10 lines of code for a fresh zone type (for one arch).
> 
> And most of the bulk of the ZONE_DMA32 implementation was stringing up
> the block layer to utilize it, not inserting the new zone type itself.

Primarily it appears that just another ZONE needs to be added, and then
free_area_init needs to be passed the proper parameters.  

I still want to look closely at how the discontig mem case for NUMA is
setup.  It is probably nothing to worry about but I want to make
certain it does not have any perverse behavior and also I want to be
certain I know how to setup a NUMA system properly, since I am looking
at the code anyway.

Eric