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author | Mike Galbraith <umgwanakikbuti@gmail.com> | 2015-03-24 08:14:49 +0100 |
---|---|---|
committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-02-13 00:36:31 +0100 |
commit | 17f79f62c23d2e982ee42e03c0937661f435c486 (patch) | |
tree | e407e70b27d51c68e2c23a0286e3a2712a97e66e | |
parent | ed73e71f7c027d7d0736d531863922e4070c4d1c (diff) | |
download | rt-linux-17f79f62c23d2e982ee42e03c0937661f435c486.tar.gz |
hotplug: Use set_cpus_allowed_ptr() in sync_unplug_thread()
do_set_cpus_allowed() is not safe vs ->sched_class change.
crash> bt
PID: 11676 TASK: ffff88026f979da0 CPU: 22 COMMAND: "sync_unplug/22"
#0 [ffff880274d25bc8] machine_kexec at ffffffff8103b41c
#1 [ffff880274d25c18] crash_kexec at ffffffff810d881a
#2 [ffff880274d25cd8] oops_end at ffffffff81525818
#3 [ffff880274d25cf8] do_invalid_op at ffffffff81003096
#4 [ffff880274d25d90] invalid_op at ffffffff8152d3de
[exception RIP: set_cpus_allowed_rt+18]
RIP: ffffffff8109e012 RSP: ffff880274d25e48 RFLAGS: 00010202
RAX: ffffffff8109e000 RBX: ffff88026f979da0 RCX: ffff8802770cb6e8
RDX: 0000000000000000 RSI: ffffffff81add700 RDI: ffff88026f979da0
RBP: ffff880274d25e78 R8: ffffffff816112e0 R9: 0000000000000001
R10: 0000000000000001 R11: 0000000000011940 R12: ffff88026f979da0
R13: ffff8802770cb6d0 R14: ffff880274d25fd8 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#5 [ffff880274d25e60] do_set_cpus_allowed at ffffffff8108e65f
#6 [ffff880274d25e80] sync_unplug_thread at ffffffff81058c08
#7 [ffff880274d25ed8] kthread at ffffffff8107cad6
#8 [ffff880274d25f50] ret_from_fork at ffffffff8152bbbc
crash> task_struct ffff88026f979da0 | grep class
sched_class = 0xffffffff816111e0 <fair_sched_class+64>,
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
-rw-r--r-- | kernel/cpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index a7dc11f6f75ee..51aafc259546f 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -268,7 +268,7 @@ static int sync_unplug_thread(void *data) * we don't want any more work on this CPU. */ current->flags &= ~PF_NO_SETAFFINITY; - do_set_cpus_allowed(current, cpu_present_mask); + set_cpus_allowed_ptr(current, cpu_present_mask); migrate_me(); return 0; } |