Commit-ID: 5175233eccc753a9d660e08b75084de250f032ad
Gitweb: http://git.kernel.org/tip/5175233eccc753a9d660e08b75084de250f032ad
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Thu, 17 Nov 2016 19:35:35 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 21 Nov 2016 16:37:08 +0100
arm/bL_switcher: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: rt@xxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20161117183541.8588-15-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/arm/common/bL_switcher.c | 34 ++++++++++++++++++++--------------
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 37dc0fe..4673001 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 12bbcf3..e3771fb 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,
--
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