[RFC,0/3] pgtable bytes mis-accounting v2

Message

Martin Schwidefsky Oct. 15, 2018, 4:42 p.m. UTC

Greetings,

the first test patch to fix the pgtable_bytes mis-accounting on s390
still had a few problems. For one it didn't work for x86 ..

Changes v1 -> v2:

 - Split the patch into three parts, one patch to add the mm_pxd_folded
   helpers, one patch to use to the helpers in mm_[dec|inc]_nr_[pmds|puds]
   and finally the fix for s390.

 - Drop the use of __is_defined, it does not work with the
   __PAGETABLE_PxD_FOLDED defines

 - Do not change the basic #ifdef'ery in mm.h, just add the calls
   to mm_pxd_folded to the pgtable_bytes accounting functions. This
   fixes the compile error on alpha (and potentially on other archs).

Martin Schwidefsky (3):
  mm: introduce mm_[p4d|pud|pmd]_folded
  mm: add mm_pxd_folded checks to pgtable_bytes accounting functions
  s390/mm: fix mis-accounting of pgtable_bytes

 arch/s390/include/asm/mmu_context.h |  5 ----
 arch/s390/include/asm/pgalloc.h     |  6 ++---
 arch/s390/include/asm/pgtable.h     | 18 ++++++++++++++
 arch/s390/include/asm/tlb.h         |  6 ++---
 include/linux/mm.h                  | 48 +++++++++++++++++++++++++++++++++++++
 5 files changed, 72 insertions(+), 11 deletions(-)