diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-11-17 19:35:35 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-11-22 23:34:41 +0100 |
| commit | a3c9b14f6f151ee4c2a119fab14f9a60d1684d60 (patch) | |
| tree | bad0878e239fbe51d03121f0397278292fde9228 | |
| parent | sched/nohz: Convert to hotplug state machine (diff) | |
| download | linux-a3c9b14f6f151ee4c2a119fab14f9a60d1684d60.tar.xz linux-a3c9b14f6f151ee4c2a119fab14f9a60d1684d60.zip | |
arm/bL_switcher: Convert to hotplug state machine
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>
| -rw-r--r-- | arch/arm/common/bL_switcher.c | 34 | ||||
| -rw-r--r-- | include/linux/cpuhotplug.h | 1 |
2 files changed, 21 insertions, 14 deletions
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c index 37dc0fe1093f..46730017b3c5 100644 --- a/arch/arm/common/bL_switcher.c +++ b/arch/arm/common/bL_switcher.c @@ -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) diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 12bbcf3ded70..e3771fb959c0 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -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, |