diff options
author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-12-22 12:36:30 +0100 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-01-05 08:40:14 +1030 |
commit | 9ea09af3bd3090e8349ca2899ca2011bd94cda85 (patch) | |
tree | 36396347bb750a6aecb0771cfebf9887aaaae492 /drivers/s390/s390mach.c | |
parent | c298be74492bece102f3379d14015638f1fd1fac (diff) |
stop_machine: introduce stop_machine_create/destroy.
Introduce stop_machine_create/destroy. With this interface subsystems
that need a non-failing stop_machine environment can create the
stop_machine machine threads before actually calling stop_machine.
When the threads aren't needed anymore they can be killed with
stop_machine_destroy again.
When stop_machine gets called and the threads aren't present they
will be created and destroyed automatically. This restores the old
behaviour of stop_machine.
This patch also converts cpu hotplug to the new interface since it
is special: cpu_down calls __stop_machine instead of stop_machine.
However the kstop threads will only be created when stop_machine
gets called.
Changing the code so that the threads would be created automatically
on __stop_machine is currently not possible: when __stop_machine gets
called we hold cpu_add_remove_lock, which is the same lock that
create_rt_workqueue would take. So the workqueue needs to be created
before the cpu hotplug code locks cpu_add_remove_lock.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/s390/s390mach.c')
0 files changed, 0 insertions, 0 deletions