Subject: Re: [PATCH V5 00/31] powerpc/mm: Update page table format for book3s 64

From: Anshuman Khandual <[email-masked]>
Date: Tue, 24 Nov 2015 12:18:57 +0530

On 11/23/2015 03:52 PM, Aneesh Kumar K.V wrote:
> Hi All,
> 
> This patch series attempt to update book3s 64 linux page table format to
> make it more flexible. Our current pte format is very restrictive and we
> overload multiple pte bits. This is due to the non-availability of free bits
> in pte_t. We use pte_t to track the validity of 4K subpages. This patch
> series free up pte_t of 11 bits by moving 4K subpage tracking to the
> lower half of PTE page. The pte format is updated such that we have a
> better method for identifying a pte entry at pmd level. This will also enable
> us to implement hugetlb migration(not yet done in this series).
> 
> Before making the changes to the pte format, I am splitting the
> pte header definition such that we now have the below layout for headers
> 
> book3s
>    32
>      hash.h pgtable.h
>    64
>      hash.h  pgtable.h hash-4k.h hash-64k.h
> booke
>   32
>      pgtable.h pte-40x.h pte-44x.h pte-8xx.h pte-fsl-booke.h
>   64
>     pgtable-4k.h  pgtable-64k.h  pgtable.h
> 
> I have done the header split such that booke headers and modified to the minimum so as to avoid
> causing breakage in booke.
> 
> The patch series can also be found at
> https://github.com/kvaneesh/linux.git book3s-pte-format

Aneesh,

The second commit on the tree branch (faa65ca8e) does not match
with the second patch posted as part of the series. Has the
tree been updated with the latest v5 patches ?

[02/31] powerpc/mm: move pte headers to book3s directory (part 2)