CVS commit: [netbsd-7-0] src/sys/arch/sparc/sparc

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Tue Jan 15 18:45:24 UTC 2019

Modified Files:
        src/sys/arch/sparc/sparc [netbsd-7-0]: pmap.c

Log Message:
Pull up following revision(s) (requested by mrg in ticket #1672):

        sys/arch/sparc/sparc/pmap.c: revision 1.366

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 -r1.358 -r1.358.6.1 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.