As part of unrelated work I ran into issus with RIXI support which allows
the creation of pages that are executable but not readable.  Problems
arise with instruction emulation on such pages, for example when a load
or store instruction is taking an unaligned exception, is an FPU
instruction that requires emulation, a trap or break instruction of
which the break code needs to bread and more.

A better solution would be to create a temporary mapping using
kmap_coherent() but that's more complex so left for a later stage.

These patches have been sitting in a shady git tree for years but seem to
work for me.  Nevertheless Comments appreciated.

Cheers,

  Ralf

Ralf Baechle (2):
  MIPS: Handle page faults of executable but unreadable pages correctly.
  MIPS: Partially disable RIXI support.

 arch/mips/mm/cache.c | 8 ++++----
 arch/mips/mm/fault.c | 3 ++-
 2 files changed, 6 insertions(+), 5 deletions(-)

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2.4.3