Commit-ID: 9805c6733349ea3ccd22cf75b8ebaabb5290e310
Gitweb: http://git.kernel.org/tip/9805c6733349ea3ccd22cf75b8ebaabb5290e310
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 24 May 2017 10:15:15 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 26 May 2017 10:10:35 +0200
cpu/hotplug: Add __cpuhp_state_add_instance_cpuslocked()
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@xxxxxxxxxxxxx>
Tested-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170524081547.321782217@xxxxxxxxxxxxx
---
include/linux/cpuhotplug.h | 9 +++++++++
kernel/cpu.c | 18 +++++++++++++++---
2 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 4fac564..df3d271 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -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);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index dc27c5a..e4389ac 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -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;
}
--
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