[kernel,v2,2/2] powerpc/mm_iommu: Allow pinning large regions

[Michael Ellerman]

On Wed, 2019-04-03 at 04:12:33 UTC, Alexey Kardashevskiy wrote:
> When called with vmas_arg==NULL, get_user_pages_longterm() allocates
> an array of nr_pages*8 which can easily get greater that the max order,
> for example, registering memory for a 256GB guest does this and fails
> in __alloc_pages_nodemask().
> 
> This adds a loop over chunks of entries to fit the max order limit.
> 
> Fixes: 678e174c4c16 ("powerpc/mm/iommu: allow migration of cma allocated pages during mm_iommu_do_alloc", 2019-03-05)
> Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/7a3a4d763837d3aa654cd10590309504

cheers