On Tue, 2018-02-13 at 11:09:33 UTC, "Aneesh Kumar K.V" wrote: > On powerpc we allocate page table pages from slab cache of different sizes. > For > now we have a constructor that zero out the objects when we allocate then for > the first time. We expect the objects to be zeroed out when we free the the > object back to slab cache. This happens in the unmap path. For hugetlb pages > we call huge_pte_get_and_clear to do that. With the current configuration of > page table size, both pud and pgd level tables get allocated from the same > slab > cache. At the pud level, we use the second half of the table to store the slot > information. But never clear that when unmapping. When such an freed object > get > allocated at pgd level, we will have part of the page table page not > initlaized > correctly. This result in kernel crash > > Simplify this by calling the object initialization after kmem_cache_alloc > > Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/fc5c2f4a55a2c258e12013cdf287cf cheers
