From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Date: Fri, 20 Sep 2019 17:50:53 -0400
Subject: [PATCH 280/351] revert-thermal
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=e5d1f189fd154780b94568b1d742c74815d52b62

Revert: thermal: Defer thermal wakups to threads

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 drivers/thermal/x86_pkg_temp_thermal.c | 52 ++------------------------
 1 file changed, 3 insertions(+), 49 deletions(-)

diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c
index a5991cbb408f..1ef937d799e4 100644
--- a/drivers/thermal/x86_pkg_temp_thermal.c
+++ b/drivers/thermal/x86_pkg_temp_thermal.c
@@ -29,7 +29,6 @@
 #include <linux/pm.h>
 #include <linux/thermal.h>
 #include <linux/debugfs.h>
-#include <linux/swork.h>
 #include <asm/cpu_device_id.h>
 #include <asm/mce.h>
 
@@ -330,7 +329,7 @@ static void pkg_thermal_schedule_work(int cpu, struct delayed_work *work)
 	schedule_delayed_work_on(cpu, work, ms);
 }
 
-static void pkg_thermal_notify_work(struct swork_event *event)
+static int pkg_thermal_notify(u64 msr_val)
 {
 	int cpu = smp_processor_id();
 	struct pkg_device *pkgdev;
@@ -349,47 +348,9 @@ static void pkg_thermal_notify_work(struct swork_event *event)
 	}
 
 	spin_unlock_irqrestore(&pkg_temp_lock, flags);
-}
-
-#ifdef CONFIG_PREEMPT_RT_FULL
-static struct swork_event notify_work;
-
-static int pkg_thermal_notify_work_init(void)
-{
-	int err;
-
-	err = swork_get();
-	if (err)
-		return err;
-
-	INIT_SWORK(&notify_work, pkg_thermal_notify_work);
 	return 0;
 }
 
-static void pkg_thermal_notify_work_cleanup(void)
-{
-	swork_put();
-}
-
-static int pkg_thermal_notify(u64 msr_val)
-{
-	swork_queue(&notify_work);
-	return 0;
-}
-
-#else  /* !CONFIG_PREEMPT_RT_FULL */
-
-static int pkg_thermal_notify_work_init(void) { return 0; }
-
-static void pkg_thermal_notify_work_cleanup(void) {  }
-
-static int pkg_thermal_notify(u64 msr_val)
-{
-	pkg_thermal_notify_work(NULL);
-	return 0;
-}
-#endif /* CONFIG_PREEMPT_RT_FULL */
-
 static int pkg_temp_thermal_device_add(unsigned int cpu)
 {
 	int pkgid = topology_logical_package_id(cpu);
@@ -554,16 +515,11 @@ static int __init pkg_temp_thermal_init(void)
 	if (!x86_match_cpu(pkg_temp_thermal_ids))
 		return -ENODEV;
 
-	if (!pkg_thermal_notify_work_init())
-		return -ENODEV;
-
 	max_packages = topology_max_packages();
 	packages = kcalloc(max_packages, sizeof(struct pkg_device *),
 			   GFP_KERNEL);
-	if (!packages) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!packages)
+		return -ENOMEM;
 
 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "thermal/x86_pkg:online",
 				pkg_thermal_cpu_online,	pkg_thermal_cpu_offline);
@@ -581,7 +537,6 @@ static int __init pkg_temp_thermal_init(void)
 	return 0;
 
 err:
-	pkg_thermal_notify_work_cleanup();
 	kfree(packages);
 	return ret;
 }
@@ -595,7 +550,6 @@ static void __exit pkg_temp_thermal_exit(void)
 	cpuhp_remove_state(pkg_thermal_hp_state);
 	debugfs_remove_recursive(debugfs);
 	kfree(packages);
-	pkg_thermal_notify_work_cleanup();
 }
 module_exit(pkg_temp_thermal_exit)