Re: [PATCH 1/6] sparc64: Add FORCE_MAX_ZONEORDER and default to 13

[David Miller]

From: Tushar Dave <tushar.n.dave@xxxxxxxxxx>
Date: Mon, 10 Oct 2016 11:12:02 -0700

> From: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
> 
> This change allows ATU (new IOMMU) in SPARC systems to request
> large (32M) contiguous memory during boot for creating IOTSB backing
> store.
> 
> Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
> Signed-off-by: Tushar Dave <tushar.n.dave@xxxxxxxxxx>

If you need 32MB allocations, wouldn't a max zone order of 12 be
sufficient?  (8K << 12 == 32MB)