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Subject[rfc patch-3.18.7-rt1] rt/nohz_full: Fix can_stop_full_tick() gripe within softirq
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The shuts gripe up.

[ 57.170576] ------------[ cut here ]------------
[ 57.170583] WARNING: CPU: 3 PID: 71 at kernel/time/tick-sched.c:167 can_stop_full_tick+0x1ae/0x260()
[ 57.170617] CPU: 3 PID: 71 Comm: sirq-timer/3 Not tainted 3.18.7-rt1 #4
[ 57.170617] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.404 11/06/2014
[ 57.170618] 0000000000000009 ffff88040b21fc48 ffffffff815bb722 0000000000000002
[ 57.170619] 0000000000000000 ffff88040b21fc88 ffffffff810512f1 ffff88040b21fcc8
[ 57.170620] ffff88041eccd360 ffff88041ecc0000 000000000000000b 0000000000000000
[ 57.170620] Call Trace:
[ 57.170624] [<ffffffff815bb722>] dump_stack+0x4f/0x9e
[ 57.170626] [<ffffffff810512f1>] warn_slowpath_common+0x81/0xc0
[ 57.170628] [<ffffffff810513ea>] warn_slowpath_null+0x1a/0x20
[ 57.170628] [<ffffffff810c1f2e>] can_stop_full_tick+0x1ae/0x260
[ 57.170629] [<ffffffff810c2071>] __tick_nohz_full_check+0x71/0xb0
[ 57.170630] [<ffffffff810c20be>] nohz_full_kick_work_func+0xe/0x10
[ 57.170631] [<ffffffff81115d3f>] irq_work_run_list+0x3f/0x60
[ 57.170632] [<ffffffff8111617e>] irq_work_tick+0x3e/0x90
[ 57.170634] [<ffffffff810b04c5>] run_timer_softirq+0x35/0x2f0
[ 57.170635] [<ffffffff8107f0a2>] ? __vtime_account_system+0x32/0x40
[ 57.170637] [<ffffffff81055794>] do_current_softirqs.isra.11+0x1c4/0x3c0
[ 57.170638] [<ffffffff81055a55>] run_ksoftirqd+0x25/0x40
[ 57.170639] [<ffffffff810723dd>] smpboot_thread_fn+0x1dd/0x340
[ 57.170640] [<ffffffff81072200>] ? smpboot_register_percpu_thread+0x100/0x100
[ 57.170641] [<ffffffff8106e4ab>] kthread+0xbb/0xe0
[ 57.170642] [<ffffffff8106e3f0>] ? kthread_worker_fn+0x190/0x190
[ 57.170644] [<ffffffff815c1cac>] ret_from_fork+0x7c/0xb0
[ 57.170644] [<ffffffff8106e3f0>] ? kthread_worker_fn+0x190/0x190
[ 57.170645] ---[ end trace 0000000000000002 ]---

Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
---
kernel/time/tick-sched.c | 2 ++
1 file changed, 2 insertions(+)

--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -222,6 +222,8 @@ void __tick_nohz_full_check(void)

static void nohz_full_kick_work_func(struct irq_work *work)
{
+ if (in_serving_softirq())
+ return;
__tick_nohz_full_check();
}




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