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| author | Peter Zijlstra <peterz@infradead.org> | 2017-09-07 17:03:52 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-09-12 17:41:04 +0200 |
| commit | 4ff9083b8a9a80bdf4ebbbec22cda4cbfb60f7aa (patch) | |
| tree | 52a68f418d81153b7f70ee064d08cbfe051bb1d8 | |
| parent | edd8e41d2e3cbd6ebe13ead30eb1adc6f48cbb33 (diff) | |
| download | linux-4ff9083b8a9a80bdf4ebbbec22cda4cbfb60f7aa.tar.bz2 | |
sched/core: WARN() when migrating to an offline CPU
Migrating tasks to offline CPUs is a pretty big fail, warn about it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170907150614.094206976@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 136a76d80dbf..18a6966567da 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1173,6 +1173,10 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) || lockdep_is_held(&task_rq(p)->lock))); #endif + /* + * Clearly, migrating tasks to offline CPUs is a fairly daft thing. + */ + WARN_ON_ONCE(!cpu_online(new_cpu)); #endif trace_sched_migrate_task(p, new_cpu); |