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cpu/hotplug: Add __cpuhp_state_add_instance_cpuslocked()

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Add cpuslocked() variants for the multi instance registration so this can
be called from a cpus_read_lock() protected region.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170524081547.321782217@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-05-24 10:15:15 +02:00
parent 71def423fe
commit 9805c67333
2 changed files with 24 additions and 3 deletions
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9
include/linux/cpuhotplug.h
View File

@ -240,6 +240,8 @@ static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
bool invoke);
int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
struct hlist_node *node, bool invoke);
/**
* cpuhp_state_add_instance - Add an instance for a state and invoke startup
@ -272,6 +274,13 @@ static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
return __cpuhp_state_add_instance(state, node, false);
}
static inline int
cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
struct hlist_node *node)
{
return __cpuhp_state_add_instance_cpuslocked(state, node, false);
}
void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);

18
kernel/cpu.c
View File

@ -1413,18 +1413,20 @@ static void cpuhp_rollback_install(int failedcpu, enum cpuhp_state state,
}
}
int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
bool invoke)
int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
struct hlist_node *node,
bool invoke)
{
struct cpuhp_step *sp;
int cpu;
int ret;
lockdep_assert_cpus_held();
sp = cpuhp_get_step(state);
if (sp->multi_instance == false)
return -EINVAL;
cpus_read_lock();
mutex_lock(&cpuhp_state_mutex);
if (!invoke || !sp->startup.multi)
@ -1453,6 +1455,16 @@ add_node:
hlist_add_head(node, &sp->list);
unlock:
mutex_unlock(&cpuhp_state_mutex);
return ret;
}
int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
bool invoke)
{
int ret;
cpus_read_lock();
ret = __cpuhp_state_add_instance_cpuslocked(state, node, invoke);
cpus_read_unlock();
return ret;
}