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ANDROID: cpu/hotplug: avoid breaking Android ABI by fusing cpuhp steps

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We can't add more values to the cpuhp_state enum, lest we break some
vendor module. So instead break out existing steps into helper functions
which call both steps. Fortunately none of these steps return anything
other than 0, so we don't need to worry about rollback.

Bug: 161946584
Fixes: 5064550d422d ("random: clear fast pool, crng, and batches in cpuhp bring up")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Icaa61291207d799bab741be7bab2b636cda09422
(cherry picked from commit 2c26b627277ef5ac79cfe10cf8183373ddddc4da)
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Jason A. Donenfeld
2022-06-23 15:17:14 +02:00
committed by Greg Kroah-Hartman
parent 25e813ddc6
commit 723971138e
2 changed files with 16 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/cpuhotplug.h
View File

@@ -59,7 +59,6 @@ enum cpuhp_state {
CPUHP_IOMMU_INTEL_DEAD,
CPUHP_LUSTRE_CFS_DEAD,
CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
CPUHP_RANDOM_PREPARE,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
@@ -178,7 +177,6 @@ enum cpuhp_state {
CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
CPUHP_AP_WATCHDOG_ONLINE,
CPUHP_AP_WORKQUEUE_ONLINE,
CPUHP_AP_RANDOM_ONLINE,
CPUHP_AP_RCUTREE_ONLINE,
CPUHP_AP_NOTIFY_PERF_ONLINE,
CPUHP_AP_BASE_CACHEINFO_ONLINE,

28
kernel/cpu.c
View File

@@ -1391,6 +1391,20 @@ core_initcall(cpu_hotplug_pm_sync_init);
int __boot_cpu_id;
/* Horrific hacks because we can't add more to cpuhp_hp_states. */
static int random_and_perf_prepare_fusion(unsigned int cpu)
{
perf_event_init_cpu(cpu);
random_prepare_cpu(cpu);
return 0;
}
static int random_and_workqueue_online_fusion(unsigned int cpu)
{
workqueue_online_cpu(cpu);
random_online_cpu(cpu);
return 0;
}
#endif /* CONFIG_SMP */
/* Boot processor state steps */
@@ -1409,14 +1423,9 @@ static struct cpuhp_step cpuhp_hp_states[] = {
},
[CPUHP_PERF_PREPARE] = {
.name = "perf:prepare",
.startup.single = perf_event_init_cpu,
.startup.single = random_and_perf_prepare_fusion,
.teardown.single = perf_event_exit_cpu,
},
[CPUHP_RANDOM_PREPARE] = {
.name = "random:prepare",
.startup.single = random_prepare_cpu,
.teardown.single = NULL,
},
[CPUHP_WORKQUEUE_PREP] = {
.name = "workqueue:prepare",
.startup.single = workqueue_prepare_cpu,
@@ -1530,14 +1539,9 @@ static struct cpuhp_step cpuhp_hp_states[] = {
},
[CPUHP_AP_WORKQUEUE_ONLINE] = {
.name = "workqueue:online",
.startup.single = workqueue_online_cpu,
.startup.single = random_and_workqueue_online_fusion,
.teardown.single = workqueue_offline_cpu,
},
[CPUHP_AP_RANDOM_ONLINE] = {
.name = "random:online",
.startup.single = random_online_cpu,
.teardown.single = NULL,
},
[CPUHP_AP_RCUTREE_ONLINE] = {
.name = "RCU/tree:online",
.startup.single = rcutree_online_cpu,