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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: cf392d10b6 "cpu/hotplug: Add multi instance support"
Reported-by: Ingo Molnar <mingo@kernel.org>
Reported-by: Fenguang Wu <fengguang.wu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
This commit is contained in:
Thomas Gleixner 2016-09-05 15:28:36 +02:00
parent 01b4115906
commit 3c1627e999
1 changed files with 74 additions and 71 deletions
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145
kernel/cpu.c
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@ -73,15 +73,15 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state);
struct cpuhp_step { struct cpuhp_step {
const char *name; const char *name;
union { union {
int (*startup)(unsigned int cpu); int (*single)(unsigned int cpu);
int (*startup_multi)(unsigned int cpu, int (*multi)(unsigned int cpu,
struct hlist_node *node); struct hlist_node *node);
}; } startup;
union { union {
int (*teardown)(unsigned int cpu); int (*single)(unsigned int cpu);
int (*teardown_multi)(unsigned int cpu, int (*multi)(unsigned int cpu,
struct hlist_node *node); struct hlist_node *node);
}; } teardown;
struct hlist_head list; struct hlist_head list;
bool skip_onerr; bool skip_onerr;
bool cant_stop; bool cant_stop;
@ -127,7 +127,7 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
int ret, cnt; int ret, cnt;
if (!step->multi_instance) { if (!step->multi_instance) {
cb = bringup ? step->startup : step->teardown; cb = bringup ? step->startup.single : step->teardown.single;
if (!cb) if (!cb)
return 0; return 0;
trace_cpuhp_enter(cpu, st->target, state, cb); 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); trace_cpuhp_exit(cpu, st->state, state, ret);
return ret; return ret;
} }
cbm = bringup ? step->startup_multi : step->teardown_multi; cbm = bringup ? step->startup.multi : step->teardown.multi;
if (!cbm) if (!cbm)
return 0; return 0;
@ -160,7 +160,7 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state,
return 0; return 0;
err: err:
/* Rollback the instances if one failed */ /* Rollback the instances if one failed */
cbm = !bringup ? step->startup_multi : step->teardown_multi; cbm = !bringup ? step->startup.multi : step->teardown.multi;
if (!cbm) if (!cbm)
return ret; return ret;
@ -1256,40 +1256,40 @@ core_initcall(cpu_hotplug_pm_sync_init);
static struct cpuhp_step cpuhp_bp_states[] = { static struct cpuhp_step cpuhp_bp_states[] = {
[CPUHP_OFFLINE] = { [CPUHP_OFFLINE] = {
.name = "offline", .name = "offline",
.startup = NULL, .startup.single = NULL,
.teardown = NULL, .teardown.single = NULL,
}, },
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
[CPUHP_CREATE_THREADS]= { [CPUHP_CREATE_THREADS]= {
.name = "threads:create", .name = "threads:create",
.startup = smpboot_create_threads, .startup.single = smpboot_create_threads,
.teardown = NULL, .teardown.single = NULL,
.cant_stop = true, .cant_stop = true,
}, },
[CPUHP_PERF_PREPARE] = { [CPUHP_PERF_PREPARE] = {
.name = "perf prepare", .name = "perf:prepare",
.startup = perf_event_init_cpu, .startup.single = perf_event_init_cpu,
.teardown = perf_event_exit_cpu, .teardown.single = perf_event_exit_cpu,
}, },
[CPUHP_WORKQUEUE_PREP] = { [CPUHP_WORKQUEUE_PREP] = {
.name = "workqueue prepare", .name = "workqueue:prepare",
.startup = workqueue_prepare_cpu, .startup.single = workqueue_prepare_cpu,
.teardown = NULL, .teardown.single = NULL,
}, },
[CPUHP_HRTIMERS_PREPARE] = { [CPUHP_HRTIMERS_PREPARE] = {
.name = "hrtimers prepare", .name = "hrtimers:prepare",
.startup = hrtimers_prepare_cpu, .startup.single = hrtimers_prepare_cpu,
.teardown = hrtimers_dead_cpu, .teardown.single = hrtimers_dead_cpu,
}, },
[CPUHP_SMPCFD_PREPARE] = { [CPUHP_SMPCFD_PREPARE] = {
.name = "SMPCFD prepare", .name = "SMPCFD:prepare",
.startup = smpcfd_prepare_cpu, .startup.single = smpcfd_prepare_cpu,
.teardown = smpcfd_dead_cpu, .teardown.single = smpcfd_dead_cpu,
}, },
[CPUHP_RCUTREE_PREP] = { [CPUHP_RCUTREE_PREP] = {
.name = "RCU-tree prepare", .name = "RCU-tree:prepare",
.startup = rcutree_prepare_cpu, .startup.single = rcutree_prepare_cpu,
.teardown = rcutree_dead_cpu, .teardown.single = rcutree_dead_cpu,
}, },
/* /*
* Preparatory and dead notifiers. Will be replaced once the notifiers * Preparatory and dead notifiers. Will be replaced once the notifiers
@ -1297,8 +1297,8 @@ static struct cpuhp_step cpuhp_bp_states[] = {
*/ */
[CPUHP_NOTIFY_PREPARE] = { [CPUHP_NOTIFY_PREPARE] = {
.name = "notify:prepare", .name = "notify:prepare",
.startup = notify_prepare, .startup.single = notify_prepare,
.teardown = notify_dead, .teardown.single = notify_dead,
.skip_onerr = true, .skip_onerr = true,
.cant_stop = true, .cant_stop = true,
}, },
@ -1308,20 +1308,21 @@ static struct cpuhp_step cpuhp_bp_states[] = {
* otherwise a RCU stall occurs. * otherwise a RCU stall occurs.
*/ */
[CPUHP_TIMERS_DEAD] = { [CPUHP_TIMERS_DEAD] = {
.name = "timers dead", .name = "timers:dead",
.startup = NULL, .startup.single = NULL,
.teardown = timers_dead_cpu, .teardown.single = timers_dead_cpu,
}, },
/* Kicks the plugged cpu into life */ /* Kicks the plugged cpu into life */
[CPUHP_BRINGUP_CPU] = { [CPUHP_BRINGUP_CPU] = {
.name = "cpu:bringup", .name = "cpu:bringup",
.startup = bringup_cpu, .startup.single = bringup_cpu,
.teardown = NULL, .teardown.single = NULL,
.cant_stop = true, .cant_stop = true,
}, },
[CPUHP_AP_SMPCFD_DYING] = { [CPUHP_AP_SMPCFD_DYING] = {
.startup = NULL, .name = "SMPCFD:dying",
.teardown = smpcfd_dying_cpu, .startup.single = NULL,
.teardown.single = smpcfd_dying_cpu,
}, },
/* /*
* Handled on controll processor until the plugged processor manages * Handled on controll processor until the plugged processor manages
@ -1329,8 +1330,8 @@ static struct cpuhp_step cpuhp_bp_states[] = {
*/ */
[CPUHP_TEARDOWN_CPU] = { [CPUHP_TEARDOWN_CPU] = {
.name = "cpu:teardown", .name = "cpu:teardown",
.startup = NULL, .startup.single = NULL,
.teardown = takedown_cpu, .teardown.single = takedown_cpu,
.cant_stop = true, .cant_stop = true,
}, },
#else #else
@ -1356,22 +1357,23 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* First state is scheduler control. Interrupts are disabled */ /* First state is scheduler control. Interrupts are disabled */
[CPUHP_AP_SCHED_STARTING] = { [CPUHP_AP_SCHED_STARTING] = {
.name = "sched:starting", .name = "sched:starting",
.startup = sched_cpu_starting, .startup.single = sched_cpu_starting,
.teardown = sched_cpu_dying, .teardown.single = sched_cpu_dying,
}, },
[CPUHP_AP_RCUTREE_DYING] = { [CPUHP_AP_RCUTREE_DYING] = {
.startup = NULL, .name = "RCU-tree:dying",
.teardown = rcutree_dying_cpu, .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 * disabled. Will be removed once the notifiers are converted to
* states. * states.
*/ */
[CPUHP_AP_NOTIFY_STARTING] = { [CPUHP_AP_NOTIFY_STARTING] = {
.name = "notify:starting", .name = "notify:starting",
.startup = notify_starting, .startup.single = notify_starting,
.teardown = notify_dying, .teardown.single = notify_dying,
.skip_onerr = true, .skip_onerr = true,
.cant_stop = true, .cant_stop = true,
}, },
@ -1383,23 +1385,23 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* Handle smpboot threads park/unpark */ /* Handle smpboot threads park/unpark */
[CPUHP_AP_SMPBOOT_THREADS] = { [CPUHP_AP_SMPBOOT_THREADS] = {
.name = "smpboot:threads", .name = "smpboot:threads",
.startup = smpboot_unpark_threads, .startup.single = smpboot_unpark_threads,
.teardown = NULL, .teardown.single = NULL,
}, },
[CPUHP_AP_PERF_ONLINE] = { [CPUHP_AP_PERF_ONLINE] = {
.name = "perf online", .name = "perf:online",
.startup = perf_event_init_cpu, .startup.single = perf_event_init_cpu,
.teardown = perf_event_exit_cpu, .teardown.single = perf_event_exit_cpu,
}, },
[CPUHP_AP_WORKQUEUE_ONLINE] = { [CPUHP_AP_WORKQUEUE_ONLINE] = {
.name = "workqueue online", .name = "workqueue:online",
.startup = workqueue_online_cpu, .startup.single = workqueue_online_cpu,
.teardown = workqueue_offline_cpu, .teardown.single = workqueue_offline_cpu,
}, },
[CPUHP_AP_RCUTREE_ONLINE] = { [CPUHP_AP_RCUTREE_ONLINE] = {
.name = "RCU-tree online", .name = "RCU-tree:online",
.startup = rcutree_online_cpu, .startup.single = rcutree_online_cpu,
.teardown = rcutree_offline_cpu, .teardown.single = rcutree_offline_cpu,
}, },
/* /*
@ -1408,8 +1410,8 @@ static struct cpuhp_step cpuhp_ap_states[] = {
*/ */
[CPUHP_AP_NOTIFY_ONLINE] = { [CPUHP_AP_NOTIFY_ONLINE] = {
.name = "notify:online", .name = "notify:online",
.startup = notify_online, .startup.single = notify_online,
.teardown = notify_down_prepare, .teardown.single = notify_down_prepare,
.skip_onerr = true, .skip_onerr = true,
}, },
#endif #endif
@ -1421,16 +1423,16 @@ static struct cpuhp_step cpuhp_ap_states[] = {
/* Last state is scheduler control setting the cpu active */ /* Last state is scheduler control setting the cpu active */
[CPUHP_AP_ACTIVE] = { [CPUHP_AP_ACTIVE] = {
.name = "sched:active", .name = "sched:active",
.startup = sched_cpu_activate, .startup.single = sched_cpu_activate,
.teardown = sched_cpu_deactivate, .teardown.single = sched_cpu_deactivate,
}, },
#endif #endif
/* CPU is fully up and running. */ /* CPU is fully up and running. */
[CPUHP_ONLINE] = { [CPUHP_ONLINE] = {
.name = "online", .name = "online",
.startup = NULL, .startup.single = NULL,
.teardown = NULL, .teardown.single = NULL,
}, },
}; };
@ -1453,8 +1455,8 @@ static void cpuhp_store_callbacks(enum cpuhp_state state,
mutex_lock(&cpuhp_state_mutex); mutex_lock(&cpuhp_state_mutex);
sp = cpuhp_get_step(state); sp = cpuhp_get_step(state);
sp->startup = startup; sp->startup.single = startup;
sp->teardown = teardown; sp->teardown.single = teardown;
sp->name = name; sp->name = name;
sp->multi_instance = multi_instance; sp->multi_instance = multi_instance;
INIT_HLIST_HEAD(&sp->list); 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) 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); struct cpuhp_step *sp = cpuhp_get_step(state);
int ret; int ret;
if ((bringup && !sp->startup) || (!bringup && !sp->teardown)) if ((bringup && !sp->startup.single) ||
(!bringup && !sp->teardown.single))
return 0; return 0;
/* /*
* The non AP bound callbacks can fail on bringup. On teardown * 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(); get_online_cpus();
if (!invoke || !sp->startup_multi) if (!invoke || !sp->startup.multi)
goto add_node; 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); ret = cpuhp_issue_call(cpu, state, true, node);
if (ret) { if (ret) {
if (sp->teardown_multi) if (sp->teardown.multi)
cpuhp_rollback_install(cpu, state, node); cpuhp_rollback_install(cpu, state, node);
goto err; goto err;
} }