From: Peter Zijlstra Date: Wed, 24 Sep 2014 08:18:52 +0000 (+0200) Subject: sched, smp: Correctly deal with nested sleeps X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7d4d26966e0b6443c78123a8a8b602e8eaf67694;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git sched, smp: Correctly deal with nested sleeps smp_hotplug_thread::{setup,unpark} functions can sleep too, so be consistent and do the same for all callbacks. __might_sleep+0x74/0x80 kmem_cache_alloc_trace+0x4e/0x1c0 perf_event_alloc+0x55/0x450 perf_event_create_kernel_counter+0x2f/0x100 watchdog_nmi_enable+0x8d/0x160 watchdog_enable+0x45/0x90 smpboot_thread_fn+0xec/0x2b0 kthread+0xe4/0x100 ret_from_fork+0x7c/0xb0 Signed-off-by: Peter Zijlstra (Intel) Cc: tglx@linutronix.de Cc: ilya.dryomov@inktank.com Cc: umgwanakikbuti@gmail.com Cc: oleg@redhat.com Cc: Linus Torvalds Link: http://lkml.kernel.org/r/20140924082242.392279328@infradead.org Signed-off-by: Ingo Molnar --- diff --git a/kernel/smpboot.c b/kernel/smpboot.c index eb89e1807408..f032fb5284e3 100644 --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -110,7 +110,7 @@ static int smpboot_thread_fn(void *data) set_current_state(TASK_INTERRUPTIBLE); preempt_disable(); if (kthread_should_stop()) { - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); preempt_enable(); if (ht->cleanup) ht->cleanup(td->cpu, cpu_online(td->cpu)); @@ -136,26 +136,27 @@ static int smpboot_thread_fn(void *data) /* Check for state change setup */ switch (td->status) { case HP_THREAD_NONE: + __set_current_state(TASK_RUNNING); preempt_enable(); if (ht->setup) ht->setup(td->cpu); td->status = HP_THREAD_ACTIVE; - preempt_disable(); - break; + continue; + case HP_THREAD_PARKED: + __set_current_state(TASK_RUNNING); preempt_enable(); if (ht->unpark) ht->unpark(td->cpu); td->status = HP_THREAD_ACTIVE; - preempt_disable(); - break; + continue; } if (!ht->thread_should_run(td->cpu)) { - preempt_enable(); + preempt_enable_no_resched(); schedule(); } else { - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); preempt_enable(); ht->thread_fn(td->cpu); }