powerpc/mm: Define flags for Strong Access Ordering
This patch defines: - PROT_SAO, which is passed into mmap() and mprotect() in the prot field - VM_SAO in vma->vm_flags, and - _PAGE_SAO, the combination of WIMG bits in the pte that enables strong access ordering for the page. Signed-off-by: NDave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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