修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/include/linux/sched/task.h
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@@ -8,10 +8,33 @@
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  */
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 #include <linux/sched.h>
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+#include <linux/uaccess.h>
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 struct task_struct;
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 struct rusage;
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 union thread_union;
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+struct css_set;
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+
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+/* All the bits taken by the old clone syscall. */
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+#define CLONE_LEGACY_FLAGS 0xffffffffULL
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+
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+struct kernel_clone_args {
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+	u64 flags;
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+	int __user *pidfd;
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+	int __user *child_tid;
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+	int __user *parent_tid;
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+	int exit_signal;
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+	unsigned long stack;
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+	unsigned long stack_size;
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+	unsigned long tls;
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+	pid_t *set_tid;
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+	/* Number of elements in *set_tid */
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+	size_t set_tid_size;
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+	int cgroup;
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+	int io_thread;
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+	struct cgroup *cgrp;
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+	struct css_set *cset;
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+};
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 /*
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  * This serializes "schedule()" and also protects
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@@ -33,32 +56,23 @@
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 extern void init_idle(struct task_struct *idle, int cpu);
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 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
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+extern void sched_cgroup_fork(struct task_struct *p, struct kernel_clone_args *kargs);
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+extern void sched_post_fork(struct task_struct *p);
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 extern void sched_dead(struct task_struct *p);
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 void __noreturn do_task_dead(void);
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+void __noreturn make_task_dead(int signr);
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+extern void mm_cache_init(void);
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 extern void proc_caches_init(void);
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 extern void fork_init(void);
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 extern void release_task(struct task_struct * p);
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-#ifdef CONFIG_HAVE_COPY_THREAD_TLS
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-extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
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-			struct task_struct *, unsigned long);
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-#else
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 extern int copy_thread(unsigned long, unsigned long, unsigned long,
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-			struct task_struct *);
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+		       struct task_struct *, unsigned long);
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-/* Architectures that haven't opted into copy_thread_tls get the tls argument
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- * via pt_regs, so ignore the tls argument passed via C. */
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-static inline int copy_thread_tls(
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-		unsigned long clone_flags, unsigned long sp, unsigned long arg,
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-		struct task_struct *p, unsigned long tls)
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-{
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-	return copy_thread(clone_flags, sp, arg, p);
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-}
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-#endif
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 extern void flush_thread(void);
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 #ifdef CONFIG_HAVE_EXIT_THREAD
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@@ -71,13 +85,14 @@
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 extern void do_group_exit(int);
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 extern void exit_files(struct task_struct *);
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-extern void exit_itimers(struct signal_struct *);
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+extern void exit_itimers(struct task_struct *);
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-extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
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-extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
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+extern pid_t kernel_clone(struct kernel_clone_args *kargs);
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+struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node);
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 struct task_struct *fork_idle(int);
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 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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 extern long kernel_wait4(pid_t, int __user *, int, struct rusage *);
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+int kernel_wait(pid_t pid, int *stat);
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 extern void free_task(struct task_struct *tsk);
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..
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@@ -88,17 +103,53 @@
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 #define sched_exec()   {}
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 #endif
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-#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
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+static inline struct task_struct *get_task_struct(struct task_struct *t)
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+{
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+	refcount_inc(&t->usage);
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+	return t;
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+}
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 extern void __put_task_struct(struct task_struct *t);
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+extern void __put_task_struct_rcu_cb(struct rcu_head *rhp);
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 static inline void put_task_struct(struct task_struct *t)
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 {
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-	if (atomic_dec_and_test(&t->usage))
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+	if (!refcount_dec_and_test(&t->usage))
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+		return;
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+
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+	/*
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+	 * under PREEMPT_RT, we can't call put_task_struct
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+	 * in atomic context because it will indirectly
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+	 * acquire sleeping locks.
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+	 *
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+	 * call_rcu() will schedule delayed_put_task_struct_rcu()
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+	 * to be called in process context.
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+	 *
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+	 * __put_task_struct() is called when
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+	 * refcount_dec_and_test(&t->usage) succeeds.
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+	 *
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+	 * This means that it can't "conflict" with
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+	 * put_task_struct_rcu_user() which abuses ->rcu the same
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+	 * way; rcu_users has a reference so task->usage can't be
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+	 * zero after rcu_users 1 -> 0 transition.
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+	 *
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+	 * delayed_free_task() also uses ->rcu, but it is only called
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+	 * when it fails to fork a process. Therefore, there is no
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+	 * way it can conflict with put_task_struct().
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+	 */
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+	if (IS_ENABLED(CONFIG_PREEMPT_RT) && !preemptible())
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+		call_rcu(&t->rcu, __put_task_struct_rcu_cb);
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+	else
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 		__put_task_struct(t);
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 }
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-struct task_struct *task_rcu_dereference(struct task_struct **ptask);
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+static inline void put_task_struct_many(struct task_struct *t, int nr)
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+{
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+	if (refcount_sub_and_test(nr, &t->usage))
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+		__put_task_struct(t);
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+}
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+
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+void put_task_struct_rcu_user(struct task_struct *task);
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 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
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 extern int arch_task_struct_size __read_mostly;