CVS commit: src/sys/arch/sparc/sparc

["matthew green" <mrg%netbsd.org@localhost>]

Module Name:    src
Committed By:   mrg
Date:           Sun Jan 13 22:11:11 UTC 2019

Modified Files:
        src/sys/arch/sparc/sparc: pmap.c

Log Message:
switch sparc pmap lock to the scheme sparc64 uses:

- local IPL_NONE mutex for general pmap locking operations, not
  kernel lock.
- for pmap_activate()/pmap_deactivate(), switch to using the
  existing ctx_lock, and push handling of it into ctx_alloc() the
  ctx_free() callers.

fixes easy to trigger deadlocks on systems with >2 cpus.  without
this patch i usually hang during boot.  with it, i was able to
push the machine hard for over 12 hours.

XXX: pullup-8, and maybe -7.


To generate a diff of this commit:
cvs rdiff -u -r1.365 -r1.366 src/sys/arch/sparc/sparc/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.