[PATCH] (1/5) sane procfs/dcache interaction

 - take unhash_process() into sched.c, move zeroing ->pid into it (and
   under tasklist_lock)

include/linux/sched.h

@@ -769,15 +769,7 @@ static inline struct task_struct *younger_sibling(struct task_struct *p)
 
 #define thread_group_leader(p)	(p->pid == p->tgid)
 
-static inline void unhash_process(struct task_struct *p)
-{
-	write_lock_irq(&tasklist_lock);
-	nr_threads--;
-	unhash_pid(p);
-	REMOVE_LINKS(p);
-	list_del(&p->thread_group);
-	write_unlock_irq(&tasklist_lock);
-}
+extern void unhash_process(struct task_struct *p);
 
 /* Protects ->fs, ->files, ->mm, and synchronises with wait4().  Nests inside tasklist_lock */
 static inline void task_lock(struct task_struct *p)

kernel/exit.c

@@ -27,6 +27,17 @@ extern struct task_struct *child_reaper;
 
 int getrusage(struct task_struct *, int, struct rusage *);
 
+static inline void __unhash_process(struct task_struct *p)
+{
+	write_lock_irq(&tasklist_lock);
+	nr_threads--;
+	unhash_pid(p);
+	REMOVE_LINKS(p);
+	list_del(&p->thread_group);
+	p->pid = 0;
+	write_unlock_irq(&tasklist_lock);
+}
+
 static void release_task(struct task_struct * p)
 {
 	if (p == current)
@@ -43,10 +54,16 @@ static void release_task(struct task_struct * p)
 	current->cmaj_flt += p->maj_flt + p->cmaj_flt;
 	current->cnswap += p->nswap + p->cnswap;
 	sched_exit(p);
-	p->pid = 0;
 	put_task_struct(p);
 }
 
+/* we are using it only for SMP init */
+
+void unhash_process(struct task_struct *p)
+{
+	return __unhash_process(p);
+}
+
 /*
  * This checks not only the pgrp, but falls back on the pid if no
  * satisfactory pgrp is found. I dunno - gdb doesn't work correctly