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powerpc/mm: Handle page table allocation failures
This fixes kernel crash that arises due to not handling page table allocation failures while allocating hugetlb page table. Fixes: e2b3d20 ("powerpc: Switch 16GB and 16MB explicit hugepages to a different page table format") Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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