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arm/bL_switcher: Convert to hotplug state machine

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Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: rt@linuxtronix.de
Cc: linux-arm-kernel@lists.infradead.org
Cc: Russell King <linux@armlinux.org.uk>
Link: http://lkml.kernel.org/r/20161117183541.8588-15-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-17 19:35:35 +01:00 committed by Thomas Gleixner
parent 31eff2434d
commit a3c9b14f6f
2 changed files with 21 additions and 14 deletions
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34
arch/arm/common/bL_switcher.c
View File

@ -757,19 +757,18 @@ EXPORT_SYMBOL_GPL(bL_switcher_put_enabled);
* 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)
static int bL_switcher_cpu_pre(unsigned int cpu)
{
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;
int pairing;
if (!bL_switcher_active)
return 0;
pairing = bL_switcher_cpu_pairing[cpu];
if (pairing == -1)
return -EINVAL;
return 0;
}
static bool no_bL_switcher;
@ -782,8 +781,15 @@ static int __init bL_switcher_init(void)
if (!mcpm_is_available())
return -ENODEV;
cpu_notifier(bL_switcher_hotplug_callback, 0);
cpuhp_setup_state_nocalls(CPUHP_ARM_BL_PREPARE, "arm/bl:prepare",
bL_switcher_cpu_pre, NULL);
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "arm/bl:predown",
NULL, bL_switcher_cpu_pre);
if (ret < 0) {
cpuhp_remove_state_nocalls(CPUHP_ARM_BL_PREPARE);
pr_err("bL_switcher: Failed to allocate a hotplug state\n");
return ret;
}
if (!no_bL_switcher) {
ret = bL_switcher_enable();
if (ret)

1
include/linux/cpuhotplug.h
View File

@ -61,6 +61,7 @@ enum cpuhp_state {
CPUHP_NET_FLOW_PREPARE,
CPUHP_TOPOLOGY_PREPARE,
CPUHP_NET_IUCV_PREPARE,
CPUHP_ARM_BL_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTF_ERR_INJ_PREPARE,
CPUHP_MIPS_SOC_PREPARE,