From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/freezer.c | 21 ++++++++++++++-------
1 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/kernel/kernel/freezer.c b/kernel/kernel/freezer.c
index b162b74..203bf9c 100644
--- a/kernel/kernel/freezer.c
+++ b/kernel/kernel/freezer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* kernel/freezer.c - Function to freeze a process
*
@@ -10,6 +11,10 @@
#include <linux/syscalls.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <linux/mmu_context.h>
+
+#undef CREATE_TRACE_POINT
+#include <trace/hooks/cgroup.h>
/* total number of freezing conditions in effect */
atomic_t system_freezing_cnt = ATOMIC_INIT(0);
@@ -20,12 +25,6 @@
*/
bool pm_freezing;
bool pm_nosig_freezing;
-
-/*
- * Temporary export for the deadlock workaround in ata_scsi_hotplug().
- * Remove once the hack becomes unnecessary.
- */
-EXPORT_SYMBOL_GPL(pm_freezing);
/* protects freezing and frozen transitions */
static DEFINE_SPINLOCK(freezer_lock);
@@ -75,6 +74,7 @@
if (!freezing(current) ||
(check_kthr_stop && kthread_should_stop()))
current->flags &= ~PF_FROZEN;
+ trace_android_rvh_refrigerator(pm_nosig_freezing);
spin_unlock_irq(&freezer_lock);
if (!(current->flags & PF_FROZEN))
@@ -151,9 +151,16 @@
void __thaw_task(struct task_struct *p)
{
unsigned long flags;
+ const struct cpumask *mask = task_cpu_possible_mask(p);
spin_lock_irqsave(&freezer_lock, flags);
- if (frozen(p))
+ /*
+ * Wake up frozen tasks. On asymmetric systems where tasks cannot
+ * run on all CPUs, ttwu() may have deferred a wakeup generated
+ * before thaw_secondary_cpus() had completed so we generate
+ * additional wakeups here for tasks in the PF_FREEZER_SKIP state.
+ */
+ if (frozen(p) || (frozen_or_skipped(p) && mask != cpu_possible_mask))
wake_up_process(p);
spin_unlock_irqrestore(&freezer_lock, flags);
}
--
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