[PATCH] sched: cleanup, remove task_t, convert to struct task_struct

cleanup: remove task_t and convert all the uses to struct task_struct. I
introduced it for the scheduler anno and it was a mistake.

Conversion was mostly scripted, the result was reviewed and all
secondary whitespace and style impact (if any) was fixed up by hand.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/alpha/kernel/process.c

@@ -474,7 +474,7 @@ do_sys_execve(char __user *ufilename, char __user * __user *argv,
  */
 
 unsigned long
-thread_saved_pc(task_t *t)
+thread_saved_pc(struct task_struct *t)
 {
 	unsigned long base = (unsigned long)task_stack_page(t);
 	unsigned long fp, sp = task_thread_info(t)->pcb.ksp;

arch/ia64/kernel/mca.c

@@ -678,7 +678,7 @@ copy_reg(const u64 *fr, u64 fnat, u64 *tr, u64 *tnat)
  */
 
 static void
-ia64_mca_modify_comm(const task_t *previous_current)
+ia64_mca_modify_comm(const struct task_struct *previous_current)
 {
 	char *p, comm[sizeof(current->comm)];
 	if (previous_current->pid)
@@ -709,7 +709,7 @@ ia64_mca_modify_comm(const task_t *previous_current)
  * that we can do backtrace on the MCA/INIT handler code itself.
  */
 
-static task_t *
+static struct task_struct *
 ia64_mca_modify_original_stack(struct pt_regs *regs,
 		const struct switch_stack *sw,
 		struct ia64_sal_os_state *sos,
@@ -719,7 +719,7 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 	ia64_va va;
 	extern char ia64_leave_kernel[];	/* Need asm address, not function descriptor */
 	const pal_min_state_area_t *ms = sos->pal_min_state;
-	task_t *previous_current;
+	struct task_struct *previous_current;
 	struct pt_regs *old_regs;
 	struct switch_stack *old_sw;
 	unsigned size = sizeof(struct pt_regs) +
@@ -1023,7 +1023,7 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 	pal_processor_state_info_t *psp = (pal_processor_state_info_t *)
 		&sos->proc_state_param;
 	int recover, cpu = smp_processor_id();
-	task_t *previous_current;
+	struct task_struct *previous_current;
 	struct ia64_mca_notify_die nd =
 		{ .sos = sos, .monarch_cpu = &monarch_cpu };
 
@@ -1352,7 +1352,7 @@ ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
 {
 	static atomic_t slaves;
 	static atomic_t monarchs;
-	task_t *previous_current;
+	struct task_struct *previous_current;
 	int cpu = smp_processor_id();
 	struct ia64_mca_notify_die nd =
 		{ .sos = sos, .monarch_cpu = &monarch_cpu };

arch/ia64/kernel/smpboot.c

@@ -124,7 +124,7 @@ extern void __devinit calibrate_delay (void);
 extern void start_ap (void);
 extern unsigned long ia64_iobase;
 
-task_t *task_for_booting_cpu;
+struct task_struct *task_for_booting_cpu;
 
 /*
  * State for each CPU

arch/mips/kernel/entry.S

@@ -65,7 +65,7 @@ need_resched:
 #endif
 
 FEXPORT(ret_from_fork)
-	jal	schedule_tail		# a0 = task_t *prev
+	jal	schedule_tail		# a0 = struct task_struct *prev
 
 FEXPORT(syscall_exit)
 	local_irq_disable		# make sure need_resched and

arch/mips/kernel/mips-mt.c

@@ -47,7 +47,7 @@ unsigned long mt_fpemul_threshold = 0;
  * used in sys_sched_set/getaffinity() in kernel/sched.c, so
  * cloned here.
  */
-static inline task_t *find_process_by_pid(pid_t pid)
+static inline struct task_struct *find_process_by_pid(pid_t pid)
 {
 	return pid ? find_task_by_pid(pid) : current;
 }
@@ -62,7 +62,7 @@ asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
 	cpumask_t new_mask;
 	cpumask_t effective_mask;
 	int retval;
-	task_t *p;
+	struct task_struct *p;
 
 	if (len < sizeof(new_mask))
 		return -EINVAL;
@@ -127,7 +127,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
 	unsigned int real_len;
 	cpumask_t mask;
 	int retval;
-	task_t *p;
+	struct task_struct *p;
 
 	real_len = sizeof(mask);
 	if (len < real_len)

arch/um/kernel/tt/process_kern.c

@@ -119,7 +119,7 @@ void suspend_new_thread(int fd)
 		panic("read failed in suspend_new_thread, err = %d", -err);
 }
 
-void schedule_tail(task_t *prev);
+void schedule_tail(struct task_struct *prev);
 
 static void new_thread_handler(int sig)
 {

drivers/char/tty_io.c

@@ -2336,7 +2336,7 @@ static int fionbio(struct file *file, int __user *p)
 
 static int tiocsctty(struct tty_struct *tty, int arg)
 {
-	task_t *p;
+	struct task_struct *p;
 
 	if (current->signal->leader &&
 	    (current->signal->session == tty->session))

fs/eventpoll.c

@@ -120,7 +120,7 @@ struct epoll_filefd {
  */
 struct wake_task_node {
 	struct list_head llink;
-	task_t *task;
+	struct task_struct *task;
 	wait_queue_head_t *wq;
 };
 
@@ -413,7 +413,7 @@ static void ep_poll_safewake(struct poll_safewake *psw, wait_queue_head_t *wq)
 {
 	int wake_nests = 0;
 	unsigned long flags;
-	task_t *this_task = current;
+	struct task_struct *this_task = current;
 	struct list_head *lsthead = &psw->wake_task_list, *lnk;
 	struct wake_task_node *tncur;
 	struct wake_task_node tnode;

include/asm-ia64/thread_info.h

@@ -68,7 +68,7 @@ struct thread_info {
 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
 
 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
-#define alloc_task_struct()	((task_t *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
+#define alloc_task_struct()	((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
 #define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
 
 #endif /* !__ASSEMBLY */

include/asm-m32r/system.h

@@ -18,7 +18,7 @@
  * switch_to(prev, next) should switch from task `prev' to `next'
  * `prev' will never be the same as `next'.
  *
- * `next' and `prev' should be task_t, but it isn't always defined
+ * `next' and `prev' should be struct task_struct, but it isn't always defined
  */
 
 #define switch_to(prev, next, last)  do { \

include/asm-sh/system.h

@@ -12,7 +12,7 @@
  */
 
 #define switch_to(prev, next, last) do {				\
- task_t *__last;							\
+ struct task_struct *__last;						\
  register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp;	\
  register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc;	\
  register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev;	\

include/linux/sched.h

@@ -184,11 +184,11 @@ extern unsigned long weighted_cpuload(const int cpu);
 extern rwlock_t tasklist_lock;
 extern spinlock_t mmlist_lock;
 
-typedef struct task_struct task_t;
+struct task_struct;
 
 extern void sched_init(void);
 extern void sched_init_smp(void);
-extern void init_idle(task_t *idle, int cpu);
+extern void init_idle(struct task_struct *idle, int cpu);
 
 extern cpumask_t nohz_cpu_mask;
 
@@ -383,7 +383,7 @@ struct signal_struct {
 	wait_queue_head_t	wait_chldexit;	/* for wait4() */
 
 	/* current thread group signal load-balancing target: */
-	task_t			*curr_target;
+	struct task_struct	*curr_target;
 
 	/* shared signal handling: */
 	struct sigpending	shared_pending;
@@ -699,7 +699,7 @@ extern int groups_search(struct group_info *group_info, gid_t grp);
     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 
 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
-extern void prefetch_stack(struct task_struct*);
+extern void prefetch_stack(struct task_struct *t);
 #else
 static inline void prefetch_stack(struct task_struct *t) { }
 #endif
@@ -1031,9 +1031,9 @@ static inline void put_task_struct(struct task_struct *t)
 #define used_math() tsk_used_math(current)
 
 #ifdef CONFIG_SMP
-extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
+extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
 #else
-static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
+static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
 {
 	if (!cpu_isset(0, new_mask))
 		return -EINVAL;
@@ -1042,7 +1042,8 @@ static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
 #endif
 
 extern unsigned long long sched_clock(void);
-extern unsigned long long current_sched_time(const task_t *current_task);
+extern unsigned long long
+current_sched_time(const struct task_struct *current_task);
 
 /* sched_exec is called by processes performing an exec */
 #ifdef CONFIG_SMP
@@ -1060,27 +1061,27 @@ static inline void idle_task_exit(void) {}
 extern void sched_idle_next(void);
 
 #ifdef CONFIG_RT_MUTEXES
-extern int rt_mutex_getprio(task_t *p);
-extern void rt_mutex_setprio(task_t *p, int prio);
-extern void rt_mutex_adjust_pi(task_t *p);
+extern int rt_mutex_getprio(struct task_struct *p);
+extern void rt_mutex_setprio(struct task_struct *p, int prio);
+extern void rt_mutex_adjust_pi(struct task_struct *p);
 #else
-static inline int rt_mutex_getprio(task_t *p)
+static inline int rt_mutex_getprio(struct task_struct *p)
 {
 	return p->normal_prio;
 }
 # define rt_mutex_adjust_pi(p)		do { } while (0)
 #endif
 
-extern void set_user_nice(task_t *p, long nice);
-extern int task_prio(const task_t *p);
-extern int task_nice(const task_t *p);
-extern int can_nice(const task_t *p, const int nice);
-extern int task_curr(const task_t *p);
+extern void set_user_nice(struct task_struct *p, long nice);
+extern int task_prio(const struct task_struct *p);
+extern int task_nice(const struct task_struct *p);
+extern int can_nice(const struct task_struct *p, const int nice);
+extern int task_curr(const struct task_struct *p);
 extern int idle_cpu(int cpu);
 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
-extern task_t *idle_task(int cpu);
-extern task_t *curr_task(int cpu);
-extern void set_curr_task(int cpu, task_t *p);
+extern struct task_struct *idle_task(int cpu);
+extern struct task_struct *curr_task(int cpu);
+extern void set_curr_task(int cpu, struct task_struct *p);
 
 void yield(void);
 
@@ -1137,8 +1138,8 @@ extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
 #else
  static inline void kick_process(struct task_struct *tsk) { }
 #endif
-extern void FASTCALL(sched_fork(task_t * p, int clone_flags));
-extern void FASTCALL(sched_exit(task_t * p));
+extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags));
+extern void FASTCALL(sched_exit(struct task_struct * p));
 
 extern int in_group_p(gid_t);
 extern int in_egroup_p(gid_t);
@@ -1243,17 +1244,17 @@ extern NORET_TYPE void do_group_exit(int);
 extern void daemonize(const char *, ...);
 extern int allow_signal(int);
 extern int disallow_signal(int);
-extern task_t *child_reaper;
+extern struct task_struct *child_reaper;
 
 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
-task_t *fork_idle(int);
+struct task_struct *fork_idle(int);
 
 extern void set_task_comm(struct task_struct *tsk, char *from);
 extern void get_task_comm(char *to, struct task_struct *tsk);
 
 #ifdef CONFIG_SMP
-extern void wait_task_inactive(task_t * p);
+extern void wait_task_inactive(struct task_struct * p);
 #else
 #define wait_task_inactive(p)	do { } while (0)
 #endif
@@ -1279,13 +1280,13 @@ extern void wait_task_inactive(task_t * p);
 /* de_thread depends on thread_group_leader not being a pid based check */
 #define thread_group_leader(p)	(p == p->group_leader)
 
-static inline task_t *next_thread(const task_t *p)
+static inline struct task_struct *next_thread(const struct task_struct *p)
 {
 	return list_entry(rcu_dereference(p->thread_group.next),
-				task_t, thread_group);
+			  struct task_struct, thread_group);
 }
 
-static inline int thread_group_empty(task_t *p)
+static inline int thread_group_empty(struct task_struct *p)
 {
 	return list_empty(&p->thread_group);
 }

kernel/capability.c

@@ -46,7 +46,7 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
      int ret = 0;
      pid_t pid;
      __u32 version;
-     task_t *target;
+     struct task_struct *target;
      struct __user_cap_data_struct data;
 
      if (get_user(version, &header->version))
@@ -96,7 +96,7 @@ static inline int cap_set_pg(int pgrp, kernel_cap_t *effective,
 			      kernel_cap_t *inheritable,
 			      kernel_cap_t *permitted)
 {
-	task_t *g, *target;
+	struct task_struct *g, *target;
 	int ret = -EPERM;
 	int found = 0;
 
@@ -128,7 +128,7 @@ static inline int cap_set_all(kernel_cap_t *effective,
 			       kernel_cap_t *inheritable,
 			       kernel_cap_t *permitted)
 {
-     task_t *g, *target;
+     struct task_struct *g, *target;
      int ret = -EPERM;
      int found = 0;
 
@@ -172,7 +172,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
 {
      kernel_cap_t inheritable, permitted, effective;
      __u32 version;
-     task_t *target;
+     struct task_struct *target;
      int ret;
      pid_t pid;