Re: [PATCH] powerpc: add support for folded p4d page tables

Michael Ellerman
2020-01-06T03:31:51Z

Mike Rapoport <rppt@kernel.org> writes:
> Any updates on this?

It's very ... big, and kind of intrusive.

It's not an improvement as far as the powerpc code's readability is
concerned. I assume the plan is that the 5-level hack can eventually be
removed and so this conversion is a prerequisite for that?

cheers

> On Mon, Dec 09, 2019 at 05:09:08PM +0200, Mike Rapoport wrote:
>> From: Mike Rapoport <rppt@linux.ibm.com>
>>
>> Implement primitives necessary for the 4th level folding, add walks of p4d
>> level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h.
>>
>> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
>> ---
>> arch/powerpc/include/asm/book3s/32/pgtable.h | 1 -
>> arch/powerpc/include/asm/book3s/64/hash.h | 4 +-
>> arch/powerpc/include/asm/book3s/64/pgalloc.h | 4 +-
>> arch/powerpc/include/asm/book3s/64/pgtable.h | 58 ++++++++++--------
>> arch/powerpc/include/asm/book3s/64/radix.h | 6 +-
>> arch/powerpc/include/asm/nohash/32/pgtable.h | 1 -
>> arch/powerpc/include/asm/nohash/64/pgalloc.h | 2 +-
>> .../include/asm/nohash/64/pgtable-4k.h | 32 +++++-----
>> arch/powerpc/include/asm/nohash/64/pgtable.h | 6 +-
>> arch/powerpc/include/asm/pgtable.h | 8 +++
>> arch/powerpc/kvm/book3s_64_mmu_radix.c | 59 ++++++++++++++++---
>> arch/powerpc/lib/code-patching.c | 7 ++-
>> arch/powerpc/mm/book3s32/mmu.c | 2 +-
>> arch/powerpc/mm/book3s32/tlb.c | 4 +-
>> arch/powerpc/mm/book3s64/hash_pgtable.c | 4 +-
>> arch/powerpc/mm/book3s64/radix_pgtable.c | 19 ++++--
>> arch/powerpc/mm/book3s64/subpage_prot.c | 6 +-
>> arch/powerpc/mm/hugetlbpage.c | 28 +++++----
>> arch/powerpc/mm/kasan/kasan_init_32.c | 8 +--
>> arch/powerpc/mm/mem.c | 4 +-
>> arch/powerpc/mm/nohash/40x.c | 4 +-
>> arch/powerpc/mm/nohash/book3e_pgtable.c | 15 +++--
>> arch/powerpc/mm/pgtable.c | 25 +++++++-
>> arch/powerpc/mm/pgtable_32.c | 28 +++++----
>> arch/powerpc/mm/pgtable_64.c | 10 ++--
>> arch/powerpc/mm/ptdump/hashpagetable.c | 20 ++++++-
>> arch/powerpc/mm/ptdump/ptdump.c | 22 ++++++-
>> arch/powerpc/xmon/xmon.c | 17 +++++-
>> 28 files changed, 284 insertions(+), 120 deletions(-)