powerpc/mm: Introduce _PAGE_LARGE software pte bits
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Mon, 28 Nov 2016 06:17:00 +0000 (11:47 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Mon, 28 Nov 2016 11:37:41 +0000 (22:37 +1100)
commit049d567af209b093eefa9f26eae6e15226db3520
tree00f33c18a0037c1bb83dd71a6525571f5ed0f7aa
parentccf17c8b5c8465750a6c514be9ef6f5b156b6c67
powerpc/mm: Introduce _PAGE_LARGE software pte bits

This patch adds a new software defined pte bit. We use the reserved
fields of ISA 3.0 pte definition since we will only be using this on DD1
code paths. We can possibly look at removing this code later.

The software bit will be used to differentiate between 64K/4K and 2M
ptes. This helps in finding the page size mapping by a pte so that we
can do efficient tlb flush.

We don't support 1G hugetlb pages yet. So we add a DEBUG WARN_ON to
catch wrong usage.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/include/asm/book3s/64/hugetlb.h
arch/powerpc/include/asm/book3s/64/pgtable.h
arch/powerpc/include/asm/book3s/64/radix.h