aboutsummaryrefslogtreecommitdiff
path: root/arch/arm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/common/bL_switcher.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
index 00a4ce23d91..fe13ce456af 100644
--- a/arch/arm/common/bL_switcher.c
+++ b/arch/arm/common/bL_switcher.c
@@ -530,6 +530,25 @@ static int __init bL_switcher_sysfs_init(void)
#endif /* CONFIG_SYSFS */
+/*
+ * Veto any CPU hotplug operation while the switcher is active.
+ * We're just not ready to deal with that given the trickery involved.
+ */
+static int bL_switcher_hotplug_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_UP_PREPARE:
+ case CPU_DOWN_PREPARE:
+ if (bL_switcher_active)
+ return NOTIFY_BAD;
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block bL_switcher_hotplug_notifier =
+ { &bL_switcher_hotplug_callback, NULL, 0 };
+
static bool no_bL_switcher;
core_param(no_bL_switcher, no_bL_switcher, bool, 0644);
@@ -542,6 +561,8 @@ static int __init bL_switcher_init(void)
return -EINVAL;
}
+ register_cpu_notifier(&bL_switcher_hotplug_notifier);
+
if (!no_bL_switcher) {
ret = bL_switcher_enable();
if (ret)