tree ec23ccf83fe827e4ec636293fab7ceaece0fadf4
parent 31278b17a0dfed3014786b623fd07ee110b801da
author Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> 1458799677 -0400
committer Michael Ellerman <mpe@ellerman.id.au> 1469096008 +1000

powerpc/mm: Add memory barrier in __hugepte_alloc()

__hugepte_alloc() uses kmem_cache_zalloc() to allocate a zeroed PTE
and proceeds to use the newly allocated PTE. Add a memory barrier to
make sure that the other CPUs see a properly initialized PTE.

Based on a fix suggested by James Dykman.

Reported-by: James Dykman <jdykman@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Tested-by: James Dykman <jdykman@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>