diff options
Diffstat (limited to 'kernel/stop_machine.c')
| -rw-r--r-- | kernel/stop_machine.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index cbc30271ea4d..0887b3af609e 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -633,6 +633,27 @@ int stop_machine(cpu_stop_fn_t fn, void *data, const struct cpumask *cpus) } EXPORT_SYMBOL_GPL(stop_machine); +#ifdef CONFIG_SCHED_SMT +int stop_core_cpuslocked(unsigned int cpu, cpu_stop_fn_t fn, void *data) +{ + const struct cpumask *smt_mask = cpu_smt_mask(cpu); + + struct multi_stop_data msdata = { + .fn = fn, + .data = data, + .num_threads = cpumask_weight(smt_mask), + .active_cpus = smt_mask, + }; + + lockdep_assert_cpus_held(); + + /* Set the initial state and stop all online cpus. */ + set_state(&msdata, MULTI_STOP_PREPARE); + return stop_cpus(smt_mask, multi_cpu_stop, &msdata); +} +EXPORT_SYMBOL_GPL(stop_core_cpuslocked); +#endif + /** * stop_machine_from_inactive_cpu - stop_machine() from inactive CPU * @fn: the function to run |