[0/4] parisc: fixes for CONFIG_PREEMPT

Message

Sven Schnelle Oct. 8, 2021, 8:48 p.m. UTC

Out of curiosity i enabled CONFIG_PREEMPT on my c8000. The kernel didn't
even compile. After fixing compilation i noticed a lot of segmentation
faults - usually a few processes crashed already at boot, with sshd the
most notable one. Most of the time the processes where crashing with a
DTLB or ITLB miss.

With these fixes, i was able to compile a linux kernel on the c8000
with preemption enabled without crashes.

Sven Schnelle (4):
  parisc: disable preemption during local tlb flush
  parisc: fix preempt_count() check in entry.S
  parisc: disable preemption in send_IPI_allbutself()
  parisc: fix warning in flush_tlb_all

 arch/parisc/kernel/cache.c | 3 +++
 arch/parisc/kernel/entry.S | 5 +++--
 arch/parisc/kernel/smp.c   | 3 ++-
 arch/parisc/mm/init.c      | 4 ++--
 4 files changed, 10 insertions(+), 5 deletions(-)