From e3e12f52b214121840b44c91de5b3e5af5d3eb84 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 06 Nov 2023 03:04:41 +0000
Subject: [PATCH] rk3568 rt init
---
kernel/kernel/fork.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 44 insertions(+), 1 deletions(-)
diff --git a/kernel/kernel/fork.c b/kernel/kernel/fork.c
index 1891a2a..6e880eb 100644
--- a/kernel/kernel/fork.c
+++ b/kernel/kernel/fork.c
@@ -42,6 +42,7 @@
#include <linux/hmm.h>
#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/kprobes.h>
#include <linux/vmacache.h>
#include <linux/nsproxy.h>
#include <linux/capability.h>
@@ -649,6 +650,19 @@
}
EXPORT_SYMBOL_GPL(__mmdrop);
+#ifdef CONFIG_PREEMPT_RT_BASE
+/*
+ * RCU callback for delayed mm drop. Not strictly rcu, but we don't
+ * want another facility to make this work.
+ */
+void __mmdrop_delayed(struct rcu_head *rhp)
+{
+ struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
+
+ __mmdrop(mm);
+}
+#endif
+
static void mmdrop_async_fn(struct work_struct *work)
{
struct mm_struct *mm;
@@ -683,12 +697,23 @@
if (atomic_dec_and_test(&sig->sigcnt))
free_signal_struct(sig);
}
-
+#ifdef CONFIG_PREEMPT_RT_BASE
+static
+#endif
void __put_task_struct(struct task_struct *tsk)
{
WARN_ON(!tsk->exit_state);
WARN_ON(atomic_read(&tsk->usage));
WARN_ON(tsk == current);
+
+ /*
+ * Remove function-return probe instances associated with this
+ * task and put them back on the free list.
+ */
+ kprobe_flush_task(tsk);
+
+ /* Task is done with its stack. */
+ put_task_stack(tsk);
cgroup_free(tsk);
task_numa_free(tsk, true);
@@ -700,7 +725,18 @@
if (!profile_handoff_task(tsk))
free_task(tsk);
}
+#ifndef CONFIG_PREEMPT_RT_BASE
EXPORT_SYMBOL_GPL(__put_task_struct);
+#else
+void __put_task_struct_cb(struct rcu_head *rhp)
+{
+ struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
+
+ __put_task_struct(tsk);
+
+}
+EXPORT_SYMBOL_GPL(__put_task_struct_cb);
+#endif
void __init __weak arch_task_cache_init(void) { }
@@ -863,6 +899,8 @@
#ifdef CONFIG_STACKPROTECTOR
tsk->stack_canary = get_random_canary();
#endif
+ if (orig->cpus_ptr == &orig->cpus_mask)
+ tsk->cpus_ptr = &tsk->cpus_mask;
/*
* One for us, one for whoever does the "release_task()" (usually
@@ -875,6 +913,7 @@
tsk->splice_pipe = NULL;
tsk->task_frag.page = NULL;
tsk->wake_q.next = NULL;
+ tsk->wake_q_sleeper.next = NULL;
account_kernel_stack(tsk, 1);
@@ -1600,6 +1639,9 @@
*/
static void posix_cpu_timers_init(struct task_struct *tsk)
{
+#ifdef CONFIG_PREEMPT_RT_BASE
+ tsk->posix_timer_list = NULL;
+#endif
tsk->cputime_expires.prof_exp = 0;
tsk->cputime_expires.virt_exp = 0;
tsk->cputime_expires.sched_exp = 0;
@@ -1915,6 +1957,7 @@
spin_lock_init(&p->alloc_lock);
init_sigpending(&p->pending);
+ p->sigqueue_cache = NULL;
p->utime = p->stime = p->gtime = 0;
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
--
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