diff options
Diffstat (limited to 'arch/arm/common')
| -rw-r--r-- | arch/arm/common/bL_switcher.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c index 0e4fb3e5e99..335ff76d4c5 100644 --- a/arch/arm/common/bL_switcher.c +++ b/arch/arm/common/bL_switcher.c @@ -554,6 +554,26 @@ static int __init bL_switcher_sysfs_init(void) #endif /* CONFIG_SYSFS */ +/* + * Veto any CPU hotplug operation on those CPUs we've removed + * 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) +{ + if (bL_switcher_active) { + int pairing = bL_switcher_cpu_pairing[(unsigned long)hcpu]; + switch (action & 0xf) { + case CPU_UP_PREPARE: + case CPU_DOWN_PREPARE: + if (pairing == -1) + return NOTIFY_BAD; + } + } + return NOTIFY_DONE; +} + static bool no_bL_switcher; core_param(no_bL_switcher, no_bL_switcher, bool, 0644); @@ -566,6 +586,8 @@ static int __init bL_switcher_init(void) return -EINVAL; } + cpu_notifier(bL_switcher_hotplug_callback, 0); + if (!no_bL_switcher) { ret = bL_switcher_enable(); if (ret) |