Commit-ID: 3c1627e999e45e292d5d7ea3751ed86a6383ee2c
Gitweb: http://git.kernel.org/tip/3c1627e999e45e292d5d7ea3751ed86a6383ee2c
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Mon, 5 Sep 2016 15:28:36 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 5 Sep 2016 15:32:58 +0200
cpu/hotplug: Replace anon union
Some compilers are unhappy with the anon union in the state array. Replace
it with a named union.
While at it align the state array initializers proper and add the missing
name tags.
Fixes: cf392d10b69e "cpu/hotplug: Add multi instance support"
Reported-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reported-by: Fenguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: rt@xxxxxxxxxxxxx
---
kernel/cpu.c | 145 ++++++++++++++++++++++++++++++-----------------------------
1 file changed, 74 insertions(+), 71 deletions(-)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index c90f839..2409ed7 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -73,15 +73,15 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state);
struct cpuhp_step {
const char *name;
union {
- int (*startup)(unsigned int cpu);
- int (*startup_multi)(unsigned int cpu,
- struct hlist_node *node);
- };
+ int (*single)(unsigned int cpu);
+ int (*multi)(unsigned int cpu,
+ struct hlist_node *node);
+ } startup;
union {
- int (*teardown)(unsigned int cpu);
- int (*teardown_multi)(unsigned int cpu,
- struct hlist_node *node);
- };
+ int (*single)(unsigned int cpu);
+ int (*multi)(unsigned int cpu,
+ struct hlist_node *node);
+ } teardown;
struct hlist_head list;
bool skip_onerr;
bool cant_stop;
@@ -127,7 +127,7 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
int ret, cnt;
if (!step->multi_instance) {
- cb = bringup ? step->startup : step->teardown;
+ cb = bringup ? step->startup.single : step->teardown.single;
if (!cb)
return 0;
trace_cpuhp_enter(cpu, st->target, state, cb);
@@ -135,7 +135,7 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
trace_cpuhp_exit(cpu, st->state, state, ret);
return ret;
}
- cbm = bringup ? step->startup_multi : step->teardown_multi;
+ cbm = bringup ? step->startup.multi : step->teardown.multi;
if (!cbm)
return 0;
@@ -160,7 +160,7 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
return 0;
err:
/* Rollback the instances if one failed */
- cbm = !bringup ? step->startup_multi : step->teardown_multi;
+ cbm = !bringup ? step->startup.multi : step->teardown.multi;
if (!cbm)
return ret;
@@ -1256,40 +1256,40 @@ core_initcall(cpu_hotplug_pm_sync_init);
static struct cpuhp_step cpuhp_bp_states[] = {
[CPUHP_OFFLINE] = {
.name = "offline",
- .startup = NULL,
- .teardown = NULL,
+ .startup.single = NULL,
+ .teardown.single = NULL,
},
#ifdef CONFIG_SMP
[CPUHP_CREATE_THREADS]= {
.name = "threads:create",
- .startup = smpboot_create_threads,
- .teardown = NULL,
+ .startup.single = smpboot_create_threads,
+ .teardown.single = NULL,
.cant_stop = true,
},
[CPUHP_PERF_PREPARE] = {
- .name = "perf prepare",
- .startup = perf_event_init_cpu,
- .teardown = perf_event_exit_cpu,
+ .name = "perf:prepare",
+ .startup.single = perf_event_init_cpu,
+ .teardown.single = perf_event_exit_cpu,
},
[CPUHP_WORKQUEUE_PREP] = {
- .name = "workqueue prepare",
- .startup = workqueue_prepare_cpu,
- .teardown = NULL,
+ .name = "workqueue:prepare",
+ .startup.single = workqueue_prepare_cpu,
+ .teardown.single = NULL,
},
[CPUHP_HRTIMERS_PREPARE] = {
- .name = "hrtimers prepare",
- .startup = hrtimers_prepare_cpu,
- .teardown = hrtimers_dead_cpu,
+ .name = "hrtimers:prepare",
+ .startup.single = hrtimers_prepare_cpu,
+ .teardown.single = hrtimers_dead_cpu,
},
[CPUHP_SMPCFD_PREPARE] = {
- .name = "SMPCFD prepare",
- .startup = smpcfd_prepare_cpu,
- .teardown = smpcfd_dead_cpu,
+ .name = "SMPCFD:prepare",
+ .startup.single = smpcfd_prepare_cpu,
+ .teardown.single = smpcfd_dead_cpu,
},
[CPUHP_RCUTREE_PREP] = {
- .name = "RCU-tree prepare",
- .startup = rcutree_prepare_cpu,
- .teardown = rcutree_dead_cpu,
+ .name = "RCU-tree:prepare",
+ .startup.single = rcutree_prepare_cpu,
+ .teardown.single = rcutree_dead_cpu,
},
/*
* Preparatory and dead notifiers. Will be replaced once the notifiers
@@ -1297,8 +1297,8 @@ static struct cpuhp_step cpuhp_bp_states[] = {
*/
[CPUHP_NOTIFY_PREPARE] = {
.name = "notify:prepare",
- .startup = notify_prepare,
- .teardown = notify_dead,
+ .startup.single = notify_prepare,
+ .teardown.single = notify_dead,
.skip_onerr = true,
.cant_stop = true,
},
@@ -1308,20 +1308,21 @@ static struct cpuhp_step cpuhp_bp_states[] = {
* otherwise a RCU stall occurs.
*/
[CPUHP_TIMERS_DEAD] = {
- .name = "timers dead",
- .startup = NULL,
- .teardown = timers_dead_cpu,
+ .name = "timers:dead",
+ .startup.single = NULL,
+ .teardown.single = timers_dead_cpu,
},
/* Kicks the plugged cpu into life */
[CPUHP_BRINGUP_CPU] = {
.name = "cpu:bringup",
- .startup = bringup_cpu,
- .teardown = NULL,
+ .startup.single = bringup_cpu,
+ .teardown.single = NULL,
.cant_stop = true,
},
[CPUHP_AP_SMPCFD_DYING] = {
- .startup = NULL,
- .teardown = smpcfd_dying_cpu,
+ .name = "SMPCFD:dying",
+ .startup.single = NULL,
+ .teardown.single = smpcfd_dying_cpu,
},
/*
* Handled on controll processor until the plugged processor manages
@@ -1329,8 +1330,8 @@ static struct cpuhp_step cpuhp_bp_states[] = {
*/
[CPUHP_TEARDOWN_CPU] = {
.name = "cpu:teardown",
- .startup = NULL,
- .teardown = takedown_cpu,
+ .startup.single = NULL,
+ .teardown.single = takedown_cpu,
.cant_stop = true,
},
#else
@@ -1356,22 +1357,23 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* First state is scheduler control. Interrupts are disabled */
[CPUHP_AP_SCHED_STARTING] = {
.name = "sched:starting",
- .startup = sched_cpu_starting,
- .teardown = sched_cpu_dying,
+ .startup.single = sched_cpu_starting,
+ .teardown.single = sched_cpu_dying,
},
[CPUHP_AP_RCUTREE_DYING] = {
- .startup = NULL,
- .teardown = rcutree_dying_cpu,
+ .name = "RCU-tree:dying",
+ .startup.single = NULL,
+ .teardown.single = rcutree_dying_cpu,
},
/*
- * Low level startup/teardown notifiers. Run with interrupts
+ * Low level startup.single/teardown notifiers. Run with interrupts
* disabled. Will be removed once the notifiers are converted to
* states.
*/
[CPUHP_AP_NOTIFY_STARTING] = {
.name = "notify:starting",
- .startup = notify_starting,
- .teardown = notify_dying,
+ .startup.single = notify_starting,
+ .teardown.single = notify_dying,
.skip_onerr = true,
.cant_stop = true,
},
@@ -1383,23 +1385,23 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* Handle smpboot threads park/unpark */
[CPUHP_AP_SMPBOOT_THREADS] = {
.name = "smpboot:threads",
- .startup = smpboot_unpark_threads,
- .teardown = NULL,
+ .startup.single = smpboot_unpark_threads,
+ .teardown.single = NULL,
},
[CPUHP_AP_PERF_ONLINE] = {
- .name = "perf online",
- .startup = perf_event_init_cpu,
- .teardown = perf_event_exit_cpu,
+ .name = "perf:online",
+ .startup.single = perf_event_init_cpu,
+ .teardown.single = perf_event_exit_cpu,
},
[CPUHP_AP_WORKQUEUE_ONLINE] = {
- .name = "workqueue online",
- .startup = workqueue_online_cpu,
- .teardown = workqueue_offline_cpu,
+ .name = "workqueue:online",
+ .startup.single = workqueue_online_cpu,
+ .teardown.single = workqueue_offline_cpu,
},
[CPUHP_AP_RCUTREE_ONLINE] = {
- .name = "RCU-tree online",
- .startup = rcutree_online_cpu,
- .teardown = rcutree_offline_cpu,
+ .name = "RCU-tree:online",
+ .startup.single = rcutree_online_cpu,
+ .teardown.single = rcutree_offline_cpu,
},
/*
@@ -1408,8 +1410,8 @@ static struct cpuhp_step cpuhp_ap_states[] = {
*/
[CPUHP_AP_NOTIFY_ONLINE] = {
.name = "notify:online",
- .startup = notify_online,
- .teardown = notify_down_prepare,
+ .startup.single = notify_online,
+ .teardown.single = notify_down_prepare,
.skip_onerr = true,
},
#endif
@@ -1421,16 +1423,16 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* Last state is scheduler control setting the cpu active */
[CPUHP_AP_ACTIVE] = {
.name = "sched:active",
- .startup = sched_cpu_activate,
- .teardown = sched_cpu_deactivate,
+ .startup.single = sched_cpu_activate,
+ .teardown.single = sched_cpu_deactivate,
},
#endif
/* CPU is fully up and running. */
[CPUHP_ONLINE] = {
.name = "online",
- .startup = NULL,
- .teardown = NULL,
+ .startup.single = NULL,
+ .teardown.single = NULL,
},
};
@@ -1453,8 +1455,8 @@ static void cpuhp_store_callbacks(enum cpuhp_state state,
mutex_lock(&cpuhp_state_mutex);
sp = cpuhp_get_step(state);
- sp->startup = startup;
- sp->teardown = teardown;
+ sp->startup.single = startup;
+ sp->teardown.single = teardown;
sp->name = name;
sp->multi_instance = multi_instance;
INIT_HLIST_HEAD(&sp->list);
@@ -1463,7 +1465,7 @@ static void cpuhp_store_callbacks(enum cpuhp_state state,
static void *cpuhp_get_teardown_cb(enum cpuhp_state state)
{
- return cpuhp_get_step(state)->teardown;
+ return cpuhp_get_step(state)->teardown.single;
}
/*
@@ -1476,7 +1478,8 @@ static int cpuhp_issue_call(int cpu, enum cpuhp_state state, bool bringup,
struct cpuhp_step *sp = cpuhp_get_step(state);
int ret;
- if ((bringup && !sp->startup) || (!bringup && !sp->teardown))
+ if ((bringup && !sp->startup.single) ||
+ (!bringup && !sp->teardown.single))
return 0;
/*
* The non AP bound callbacks can fail on bringup. On teardown
@@ -1554,7 +1557,7 @@ int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
get_online_cpus();
- if (!invoke || !sp->startup_multi)
+ if (!invoke || !sp->startup.multi)
goto add_node;
/*
@@ -1570,7 +1573,7 @@ int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
ret = cpuhp_issue_call(cpu, state, true, node);
if (ret) {
- if (sp->teardown_multi)
+ if (sp->teardown.multi)
cpuhp_rollback_install(cpu, state, node);
goto err;
}
--
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