[PATCH 0/6] powerpc/rtas: miscellaneous cleanups, user region allocation

[Nathan Lynch]

The region exposed to user space for use as work areas passed to
sys_rtas() can be incorrectly allocated on radix, leading to failures
in users of librtas. Correct this and clean up some of the code
visited along the way.

I think the cleanups should be unobjectionable and I've placed them
first in the series. Please check my work on the rtas_rmo_buf
allocation changes; they are only lightly tested so far (slot add on
Power9 PowerVM, and comparison of /memory at 0/reg with the contents of
/proc/powerpc/rtas/rmo_buf on qemu Power9 w/radix).

I suspect the per-cpu RTAS argument structures for reentrant calls
need similar measures, but I can add that to the series once there is
consensus on the approach.

Nathan Lynch (6):
  powerpc/rtas: improve ppc_rtas_rmo_buf_show documentation
  powerpc/rtas-proc: remove unused RMO_READ_BUF_MAX
  powerpc/rtas: remove ibm_suspend_me_token
  powerpc/rtas: move syscall filter setup into separate function
  powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE
  powerpc/rtas: constrain user region allocation to RMA

 arch/powerpc/include/asm/rtas.h |   9 ++-
 arch/powerpc/kernel/rtas-proc.c |  15 +++--
 arch/powerpc/kernel/rtas.c      | 108 ++++++++++++++++++++++++--------
 3 files changed, 98 insertions(+), 34 deletions(-)

-- 
2.29.2