sched/headers: Move task lifetime APIs from <linux/sched.h> to <linux/sched/task.h>
There's a fair amount of task lifetime management (a.k.a fork()/exit()) related APIs in <linux/sched.h>, but only a small fraction of the users of the generic sched.h header make use of them. Move these functions to the <linux/sched/task.h> header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -165,28 +165,10 @@ struct task_group;
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/* Task command name length */
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#define TASK_COMM_LEN 16
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#include <linux/spinlock.h>
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/*
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* This serializes "schedule()" and also protects
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* the run-queue from deletions/modifications (but
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* _adding_ to the beginning of the run-queue has
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* a separate lock).
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*/
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extern rwlock_t tasklist_lock;
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extern spinlock_t mmlist_lock;
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struct task_struct;
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#ifdef CONFIG_PROVE_RCU
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extern int lockdep_tasklist_lock_is_held(void);
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#endif /* #ifdef CONFIG_PROVE_RCU */
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extern void sched_init(void);
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extern void sched_init_smp(void);
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extern asmlinkage void schedule_tail(struct task_struct *prev);
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extern void init_idle(struct task_struct *idle, int cpu);
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extern void init_idle_bootup_task(struct task_struct *idle);
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extern cpumask_var_t cpu_isolated_map;
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@ -211,8 +193,6 @@ extern void io_schedule_finish(int token);
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extern long io_schedule_timeout(long timeout);
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extern void io_schedule(void);
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void __noreturn do_task_dead(void);
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struct nsproxy;
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/**
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@ -1120,24 +1100,6 @@ struct task_struct {
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*/
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};
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#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
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extern int arch_task_struct_size __read_mostly;
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#else
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# define arch_task_struct_size (sizeof(struct task_struct))
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#endif
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#ifdef CONFIG_VMAP_STACK
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
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{
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return t->stack_vm_area;
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}
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#else
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
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{
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return NULL;
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}
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#endif
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static inline struct pid *task_pid(struct task_struct *task)
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{
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return task->pids[PIDTYPE_PID].pid;
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@ -1429,21 +1391,6 @@ TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
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TASK_PFA_TEST(LMK_WAITING, lmk_waiting)
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TASK_PFA_SET(LMK_WAITING, lmk_waiting)
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static inline void rcu_copy_process(struct task_struct *p)
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{
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#ifdef CONFIG_PREEMPT_RCU
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p->rcu_read_lock_nesting = 0;
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p->rcu_read_unlock_special.s = 0;
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p->rcu_blocked_node = NULL;
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INIT_LIST_HEAD(&p->rcu_node_entry);
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#endif /* #ifdef CONFIG_PREEMPT_RCU */
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#ifdef CONFIG_TASKS_RCU
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p->rcu_tasks_holdout = false;
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INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
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p->rcu_tasks_idle_cpu = -1;
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#endif /* #ifdef CONFIG_TASKS_RCU */
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}
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static inline void tsk_restore_flags(struct task_struct *task,
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unsigned long orig_flags, unsigned long flags)
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{
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@ -1572,45 +1519,11 @@ extern void wake_up_new_task(struct task_struct *tsk);
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#else
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static inline void kick_process(struct task_struct *tsk) { }
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#endif
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extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
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extern void sched_dead(struct task_struct *p);
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extern void proc_caches_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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/* 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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extern void exit_thread(struct task_struct *tsk);
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#else
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static inline void exit_thread(struct task_struct *tsk)
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{
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}
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#endif
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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 do_group_exit(int);
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extern int do_execve(struct filename *,
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const char __user * const __user *,
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const char __user * const __user *);
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@ -1618,10 +1531,6 @@ extern int do_execveat(int, struct filename *,
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const char __user * const __user *,
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const char __user * const __user *,
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int);
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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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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 void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
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static inline void set_task_comm(struct task_struct *tsk, const char *from)
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@ -1,6 +1,103 @@
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#ifndef _LINUX_SCHED_TASK_H
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#define _LINUX_SCHED_TASK_H
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/*
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* Interface between the scheduler and various task lifetime (fork()/exit())
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* functionality:
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*/
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#include <linux/sched.h>
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/*
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* This serializes "schedule()" and also protects
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* the run-queue from deletions/modifications (but
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* _adding_ to the beginning of the run-queue has
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* a separate lock).
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*/
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extern rwlock_t tasklist_lock;
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extern spinlock_t mmlist_lock;
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#ifdef CONFIG_PROVE_RCU
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extern int lockdep_tasklist_lock_is_held(void);
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#endif /* #ifdef CONFIG_PROVE_RCU */
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extern asmlinkage void schedule_tail(struct task_struct *prev);
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extern void init_idle(struct task_struct *idle, int cpu);
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extern void init_idle_bootup_task(struct task_struct *idle);
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static inline void rcu_copy_process(struct task_struct *p)
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{
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#ifdef CONFIG_PREEMPT_RCU
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p->rcu_read_lock_nesting = 0;
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p->rcu_read_unlock_special.s = 0;
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p->rcu_blocked_node = NULL;
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INIT_LIST_HEAD(&p->rcu_node_entry);
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#endif /* #ifdef CONFIG_PREEMPT_RCU */
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#ifdef CONFIG_TASKS_RCU
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p->rcu_tasks_holdout = false;
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INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
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p->rcu_tasks_idle_cpu = -1;
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#endif /* #ifdef CONFIG_TASKS_RCU */
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}
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extern int sched_fork(unsigned long clone_flags, 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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extern void proc_caches_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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/* 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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extern void exit_thread(struct task_struct *tsk);
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#else
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static inline void exit_thread(struct task_struct *tsk)
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{
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}
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#endif
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extern void do_group_exit(int);
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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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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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#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
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extern int arch_task_struct_size __read_mostly;
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#else
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# define arch_task_struct_size (sizeof(struct task_struct))
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#endif
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#ifdef CONFIG_VMAP_STACK
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
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{
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return t->stack_vm_area;
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}
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#else
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
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{
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return NULL;
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}
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#endif
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#endif /* _LINUX_SCHED_TASK_H */
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