X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Ffork.c;h=fb8572a4229743baef22241dbab6ae8356f633c7;hb=bc781aa93e6dfa85aa251c8898f831031db55c49;hp=2048ed7b5872262f963c6bbb633769b7baaff4cb;hpb=4294621f41a85497019fae64341aa5351a1921b7;p=linux-2.6

diff --git a/kernel/fork.c b/kernel/fork.c
index 2048ed7b58..fb8572a422 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -42,6 +42,7 @@
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/acct.h>
+#include <linux/cn_proc.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -170,10 +171,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 		return NULL;
 	}
 
-	*ti = *orig->thread_info;
 	*tsk = *orig;
 	tsk->thread_info = ti;
-	ti->task = tsk;
+	setup_thread_stack(tsk, orig);
 
 	/* One for us, one for whoever does the "release_task()" (usually parent) */
 	atomic_set(&tsk->usage,2);
@@ -182,16 +182,18 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 }
 
 #ifdef CONFIG_MMU
-static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
+static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 {
-	struct vm_area_struct * mpnt, *tmp, **pprev;
+	struct vm_area_struct *mpnt, *tmp, **pprev;
 	struct rb_node **rb_link, *rb_parent;
 	int retval;
 	unsigned long charge;
 	struct mempolicy *pol;
 
 	down_write(&oldmm->mmap_sem);
-	flush_cache_mm(current->mm);
+	flush_cache_mm(oldmm);
+	down_write(&mm->mmap_sem);
+
 	mm->locked_vm = 0;
 	mm->mmap = NULL;
 	mm->mmap_cache = NULL;
@@ -204,7 +206,7 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
 	rb_parent = NULL;
 	pprev = &mm->mmap;
 
-	for (mpnt = current->mm->mmap ; mpnt ; mpnt = mpnt->vm_next) {
+	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
 		struct file *file;
 
 		if (mpnt->vm_flags & VM_DONTCOPY) {
@@ -251,12 +253,8 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
 		}
 
 		/*
-		 * Link in the new vma and copy the page table entries:
-		 * link in first so that swapoff can see swap entries.
-		 * Note that, exceptionally, here the vma is inserted
-		 * without holding mm->mmap_sem.
+		 * Link in the new vma and copy the page table entries.
 		 */
-		spin_lock(&mm->page_table_lock);
 		*pprev = tmp;
 		pprev = &tmp->vm_next;
 
@@ -265,8 +263,7 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
 		rb_parent = &tmp->vm_rb;
 
 		mm->map_count++;
-		retval = copy_page_range(mm, current->mm, tmp);
-		spin_unlock(&mm->page_table_lock);
+		retval = copy_page_range(mm, oldmm, mpnt);
 
 		if (tmp->vm_ops && tmp->vm_ops->open)
 			tmp->vm_ops->open(tmp);
@@ -275,9 +272,9 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
 			goto out;
 	}
 	retval = 0;
-
 out:
-	flush_tlb_mm(current->mm);
+	up_write(&mm->mmap_sem);
+	flush_tlb_mm(oldmm);
 	up_write(&oldmm->mmap_sem);
 	return retval;
 fail_nomem_policy:
@@ -326,7 +323,6 @@ static struct mm_struct * mm_init(struct mm_struct * mm)
 	spin_lock_init(&mm->page_table_lock);
 	rwlock_init(&mm->ioctx_list_lock);
 	mm->ioctx_list = NULL;
-	mm->default_kioctx = (struct kioctx)INIT_KIOCTX(mm->default_kioctx, *mm);
 	mm->free_area_cache = TASK_UNMAPPED_BASE;
 	mm->cached_hole_size = ~0UL;
 
@@ -472,13 +468,6 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
 	if (clone_flags & CLONE_VM) {
 		atomic_inc(&oldmm->mm_users);
 		mm = oldmm;
-		/*
-		 * There are cases where the PTL is held to ensure no
-		 * new threads start up in user mode using an mm, which
-		 * allows optimizing out ipis; the tlb_gather_mmu code
-		 * is an example.
-		 */
-		spin_unlock_wait(&oldmm->page_table_lock);
 		goto good_mm;
 	}
 
@@ -928,7 +917,7 @@ static task_t *copy_process(unsigned long clone_flags,
 	if (nr_threads >= max_threads)
 		goto bad_fork_cleanup_count;
 
-	if (!try_module_get(p->thread_info->exec_domain->module))
+	if (!try_module_get(task_thread_info(p)->exec_domain->module))
 		goto bad_fork_cleanup_count;
 
 	if (p->binfmt && !try_module_get(p->binfmt->module))
@@ -1135,8 +1124,6 @@ static task_t *copy_process(unsigned long clone_flags,
 	if (unlikely(p->ptrace & PT_PTRACED))
 		__ptrace_link(p, current->parent);
 
-	cpuset_fork(p);
-
 	attach_pid(p, PIDTYPE_PID, p->pid);
 	attach_pid(p, PIDTYPE_TGID, p->tgid);
 	if (thread_group_leader(p)) {
@@ -1152,6 +1139,8 @@ static task_t *copy_process(unsigned long clone_flags,
 	nr_threads++;
 	total_forks++;
 	write_unlock_irq(&tasklist_lock);
+	proc_fork_connector(p);
+	cpuset_fork(p);
 	retval = 0;
 
 fork_out:
@@ -1188,7 +1177,7 @@ bad_fork_cleanup:
 	if (p->binfmt)
 		module_put(p->binfmt->module);
 bad_fork_cleanup_put_domain:
-	module_put(p->thread_info->exec_domain->module);
+	module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
 	put_group_info(p->group_info);
 	atomic_dec(&p->user->processes);