mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-16 13:19:56 -04:00
Code Issues Packages Projects Releases Wiki Activity

Merge branches 'doc.2020.02.27a', 'fixes.2020.03.21a', 'kfree_rcu.2020.02.20a', 'locktorture.2020.02.20a', 'ovld.2020.02.20a', 'rcu-tasks.2020.02.20a', 'srcu.2020.02.20a' and 'torture.2020.02.20a' into HEAD

Browse Source 
doc.2020.02.27a: Documentation updates.
fixes.2020.03.21a: Miscellaneous fixes.
kfree_rcu.2020.02.20a: Updates to kfree_rcu().
locktorture.2020.02.20a: Lock torture-test updates.
ovld.2020.02.20a: Updates to callback-overload handling.
rcu-tasks.2020.02.20a: RCU-tasks updates.
srcu.2020.02.20a: SRCU updates.
torture.2020.02.20a: Torture-test updates.
This commit is contained in:
Paul E. McKenney
2020-03-21 17:15:11 -07:00
parent 8149b5cbfa 127e29815b 613707929b 28e09a2e48 b692dc4adf 90ba11ba99 710426068d a144935cea
commit aa93ec620b
29 changed files with 644 additions and 203 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
kernel/rcu/update.c
View File

@@ -183,6 +183,8 @@ void rcu_unexpedite_gp(void)
}
EXPORT_SYMBOL_GPL(rcu_unexpedite_gp);
static bool rcu_boot_ended __read_mostly;
/*
* Inform RCU of the end of the in-kernel boot sequence.
*/
@@ -191,8 +193,18 @@ void rcu_end_inkernel_boot(void)
rcu_unexpedite_gp();
if (rcu_normal_after_boot)
WRITE_ONCE(rcu_normal, 1);
rcu_boot_ended = 1;
}
/*
* Let rcutorture know when it is OK to turn it up to eleven.
*/
bool rcu_inkernel_boot_has_ended(void)
{
return rcu_boot_ended;
}
EXPORT_SYMBOL_GPL(rcu_inkernel_boot_has_ended);
#endif /* #ifndef CONFIG_TINY_RCU */
/*
@@ -464,13 +476,19 @@ EXPORT_SYMBOL_GPL(rcutorture_sched_setaffinity);
#ifdef CONFIG_RCU_STALL_COMMON
int rcu_cpu_stall_ftrace_dump __read_mostly;
module_param(rcu_cpu_stall_ftrace_dump, int, 0644);
int rcu_cpu_stall_suppress __read_mostly; /* 1 = suppress stall warnings. */
int rcu_cpu_stall_suppress __read_mostly; // !0 = suppress stall warnings.
EXPORT_SYMBOL_GPL(rcu_cpu_stall_suppress);
module_param(rcu_cpu_stall_suppress, int, 0644);
int rcu_cpu_stall_timeout __read_mostly = CONFIG_RCU_CPU_STALL_TIMEOUT;
module_param(rcu_cpu_stall_timeout, int, 0644);
#endif /* #ifdef CONFIG_RCU_STALL_COMMON */
// Suppress boot-time RCU CPU stall warnings and rcutorture writer stall
// warnings. Also used by rcutorture even if stall warnings are excluded.
int rcu_cpu_stall_suppress_at_boot __read_mostly; // !0 = suppress boot stalls.
EXPORT_SYMBOL_GPL(rcu_cpu_stall_suppress_at_boot);
module_param(rcu_cpu_stall_suppress_at_boot, int, 0444);
#ifdef CONFIG_TASKS_RCU
/*
@@ -528,7 +546,7 @@ void call_rcu_tasks(struct rcu_head *rhp, rcu_callback_t func)
rhp->func = func;
raw_spin_lock_irqsave(&rcu_tasks_cbs_lock, flags);
needwake = !rcu_tasks_cbs_head;
*rcu_tasks_cbs_tail = rhp;
WRITE_ONCE(*rcu_tasks_cbs_tail, rhp);
rcu_tasks_cbs_tail = &rhp->next;
raw_spin_unlock_irqrestore(&rcu_tasks_cbs_lock, flags);
/* We can't create the thread unless interrupts are enabled. */
@@ -658,7 +676,7 @@ static int __noreturn rcu_tasks_kthread(void *arg)
/* If there were none, wait a bit and start over. */
if (!list) {
wait_event_interruptible(rcu_tasks_cbs_wq,
rcu_tasks_cbs_head);
READ_ONCE(rcu_tasks_cbs_head));
if (!rcu_tasks_cbs_head) {
WARN_ON(signal_pending(current));
schedule_timeout_interruptible(HZ/10);
@@ -801,7 +819,7 @@ static int __init rcu_spawn_tasks_kthread(void)
core_initcall(rcu_spawn_tasks_kthread);
/* Do the srcu_read_lock() for the above synchronize_srcu(). */
void exit_tasks_rcu_start(void)
void exit_tasks_rcu_start(void) __acquires(&tasks_rcu_exit_srcu)
{
preempt_disable();
current->rcu_tasks_idx = __srcu_read_lock(&tasks_rcu_exit_srcu);
@@ -809,7 +827,7 @@ void exit_tasks_rcu_start(void)
}
/* Do the srcu_read_unlock() for the above synchronize_srcu(). */
void exit_tasks_rcu_finish(void)
void exit_tasks_rcu_finish(void) __releases(&tasks_rcu_exit_srcu)
{
preempt_disable();
__srcu_read_unlock(&tasks_rcu_exit_srcu, current->rcu_tasks_idx);