[RFC][PATCH 0/2] fun with tlb flushing on s390

[Martin Schwidefsky <schwidefsky@de.ibm.com>]

A code review revealed another potential race in regard to TLB flushing
on s390. See patch #2 for the ugly details. To fix this I would like
to use the arch_enter_lazy_mmu_mode/arch_leave_lazy_mmu_mode but to do
that the pointer to the mm in question needs to be added to the functions.
To keep things symmetrical arch_flush_lazy_mmu_mode should grow an mm
argument as well.

powerpc and x86 have a non-empty implementation for the lazy mmu flush
primitives and tile calls the generic definition in the architecture
files (which is a bit strange because the generic definition is empty).
Comments?

Martin Schwidefsky (2):
  add mm argument to lazy mmu mode hooks
  s390/tlb: race of lazy TLB flush vs. recreation of TLB entries

 arch/powerpc/include/asm/tlbflush.h |    6 ++---
 arch/powerpc/mm/subpage-prot.c      |    4 ++--
 arch/powerpc/mm/tlb_hash64.c        |    4 ++--
 arch/s390/include/asm/hugetlb.h     |   24 ++++++++-----------
 arch/s390/include/asm/mmu_context.h |   13 ++++++++---
 arch/s390/include/asm/pgtable.h     |   43 ++++++++++++++++++++++-------------
 arch/s390/include/asm/tlb.h         |    3 ++-
 arch/s390/include/asm/tlbflush.h    |    8 +++----
 arch/s390/mm/pgtable.c              |    6 ++---
 arch/tile/mm/fault.c                |    2 +-
 arch/tile/mm/highmem.c              |    4 ++--
 arch/x86/include/asm/paravirt.h     |    6 ++---
 arch/x86/kernel/paravirt.c          |   10 ++++----
 arch/x86/mm/highmem_32.c            |    4 ++--
 arch/x86/mm/iomap_32.c              |    2 +-
 include/asm-generic/pgtable.h       |    6 ++---
 mm/memory.c                         |   16 ++++++-------
 mm/mprotect.c                       |    4 ++--
 mm/mremap.c                         |    4 ++--
 19 files changed, 91 insertions(+), 78 deletions(-)

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1.7.10.4