[V2,1/4] powerpc/mm: Fix crashes with PUD level hugetlb config

[Michael Ellerman]

On Sun, 2018-02-11 at 15:00:06 UTC, "Aneesh Kumar K.V" wrote:
> To support memory keys, we moved the hash pte slot information to the second
> half of the page table. This was ok with PTE entries at level 4 and level 3.
> We already allocate larger page table pages at those level to accomodate extra
> details. For level 4 we already have the extra space which was used to track
> 4k hash page table entry details and at pmd level the extra space was allocated
> to track the THP details.
> 
> With hugetlbfs PTE, we used this extra space at the PMD level to store the
> slot details. But we also support hugetlbfs PTE at PUD leve and PUD level page
> didn't allocate extra space. This resulted in memory corruption.
> 
> Fix this by allocating extra space at PUD level when HUGETLB is enabled. We
> may need further changes to allocate larger space at PMD level when we enable
> HUGETLB. That will be done in next patch.
> 
> Fixes:bf9a95f9a6481bc6e(" powerpc: Free up four 64K PTE bits in 64K backed HPTE pages")
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> Reviewed-by: Ram Pai <linuxram at us.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/fae2211697c9490414e974431051f7

cheers