S390 topology: don't use kthread() for arch_reinit_sched_domains()
Now that it is safe to use get_online_cpus() we can revert
[S390] cpu topology: Fix possible deadlock.
commit: fd781fa25c9e9c6fd1599df060b05e7c4ad724e5
and call arch_reinit_sched_domains() directly from topology_work_fn().
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 212d618..632b13e 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -9,7 +9,6 @@
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/sched.h>
-#include <linux/kthread.h>
#include <linux/workqueue.h>
#include <linux/cpu.h>
#include <linux/smp.h>
@@ -230,20 +229,9 @@
}
}
-static int topology_kthread(void *data)
-{
- arch_reinit_sched_domains();
- return 0;
-}
-
static void topology_work_fn(struct work_struct *work)
{
- /* We can't call arch_reinit_sched_domains() from a multi-threaded
- * workqueue context since it may deadlock in case of cpu hotplug.
- * So we have to create a kernel thread in order to call
- * arch_reinit_sched_domains().
- */
- kthread_run(topology_kthread, NULL, "topology_update");
+ arch_reinit_sched_domains();
}
void topology_schedule_update(void)