Blackfin: add support for common FDPIC ptrace requests

[safe/jmp/linux-2.6] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index bb762b4..bfee931 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -17,7 +17,6 @@
 #include <linux/module.h>
 #include <linux/vmalloc.h>
 #include <linux/completion.h>
-#include <linux/mnt_namespace.h>
 #include <linux/personality.h>
 #include <linux/mempolicy.h>
 #include <linux/sem.h>
@@ -62,6 +61,7 @@
 #include <linux/blkdev.h>
 #include <linux/fs_struct.h>
 #include <linux/magic.h>
+#include <linux/perf_counter.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -152,8 +152,7 @@ void __put_task_struct(struct task_struct *tsk)
        WARN_ON(atomic_read(&tsk->usage));
        WARN_ON(tsk == current);
 
-       put_cred(tsk->real_cred);
-       put_cred(tsk->cred);
+       exit_creds(tsk);
        delayacct_tsk_free(tsk);
 
        if (!profile_handoff_task(tsk))
@@ -177,7 +176,7 @@ void __init fork_init(unsigned long mempages)
        /* create a slab on which task_structs can be allocated */
        task_struct_cachep =
                kmem_cache_create("task_struct", sizeof(struct task_struct),
-                       ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL);
+                       ARCH_MIN_TASKALIGN, SLAB_PANIC | SLAB_NOTRACK, NULL);
 #endif
 
        /* do the arch specific task caches init */
@@ -567,18 +566,18 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
         * the value intact in a core dump, and to save the unnecessary
         * trouble otherwise.  Userland only wants this done for a sys_exit.
         */
-       if (tsk->clear_child_tid
-           && !(tsk->flags & PF_SIGNALED)
-           && atomic_read(&mm->mm_users) > 1) {
-               u32 __user * tidptr = tsk->clear_child_tid;
+       if (tsk->clear_child_tid) {
+               if (!(tsk->flags & PF_SIGNALED) &&
+                   atomic_read(&mm->mm_users) > 1) {
+                       /*
+                        * We don't check the error code - if userspace has
+                        * not set up a proper pointer then tough luck.
+                        */
+                       put_user(0, tsk->clear_child_tid);
+                       sys_futex(tsk->clear_child_tid, FUTEX_WAKE,
+                                       1, NULL, NULL, 0);
+               }
                tsk->clear_child_tid = NULL;
-
-               /*
-                * We don't check the error code - if userspace has
-                * not set up a proper pointer then tough luck.
-                */
-               put_user(0, tidptr);
-               sys_futex(tidptr, FUTEX_WAKE, 1, NULL, NULL, 0);
        }
 }
 
@@ -815,11 +814,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 {
        struct signal_struct *sig;
 
-       if (clone_flags & CLONE_THREAD) {
-               atomic_inc(&current->signal->count);
-               atomic_inc(&current->signal->live);
+       if (clone_flags & CLONE_THREAD)
                return 0;
-       }
 
        sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
        tsk->signal = sig;
@@ -877,16 +873,6 @@ void __cleanup_signal(struct signal_struct *sig)
        kmem_cache_free(signal_cachep, sig);
 }
 
-static void cleanup_signal(struct task_struct *tsk)
-{
-       struct signal_struct *sig = tsk->signal;
-
-       atomic_dec(&sig->live);
-
-       if (atomic_dec_and_test(&sig->count))
-               __cleanup_signal(sig);
-}
-
 static void copy_flags(unsigned long clone_flags, struct task_struct *p)
 {
        unsigned long new_flags = p->flags;
@@ -1021,14 +1007,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        copy_flags(clone_flags, p);
        INIT_LIST_HEAD(&p->children);
        INIT_LIST_HEAD(&p->sibling);
-#ifdef CONFIG_PREEMPT_RCU
-       p->rcu_read_lock_nesting = 0;
-       p->rcu_flipctr_idx = 0;
-#endif /* #ifdef CONFIG_PREEMPT_RCU */
+       rcu_copy_process(p);
        p->vfork_done = NULL;
        spin_lock_init(&p->alloc_lock);
 
-       clear_tsk_thread_flag(p, TIF_SIGPENDING);
        init_sigpending(&p->pending);
 
        p->utime = cputime_zero;
@@ -1096,6 +1078,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        /* Perform scheduler related setup. Assign this task to a CPU. */
        sched_fork(p, clone_flags);
 
+       retval = perf_counter_init_task(p);
+       if (retval)
+               goto bad_fork_cleanup_policy;
+
        if ((retval = audit_alloc(p)))
                goto bad_fork_cleanup_policy;
        /* copy all the process information */
@@ -1236,6 +1222,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        }
 
        if (clone_flags & CLONE_THREAD) {
+               atomic_inc(&current->signal->count);
+               atomic_inc(&current->signal->live);
                p->group_leader = current->group_leader;
                list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
        }
@@ -1265,6 +1253,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        write_unlock_irq(&tasklist_lock);
        proc_fork_connector(p);
        cgroup_post_fork(p);
+       perf_counter_fork(p);
        return p;
 
 bad_fork_free_pid:
@@ -1278,7 +1267,8 @@ bad_fork_cleanup_mm:
        if (p->mm)
                mmput(p->mm);
 bad_fork_cleanup_signal:
-       cleanup_signal(p);
+       if (!(clone_flags & CLONE_THREAD))
+               __cleanup_signal(p->signal);
 bad_fork_cleanup_sighand:
        __cleanup_sighand(p->sighand);
 bad_fork_cleanup_fs:
@@ -1290,6 +1280,7 @@ bad_fork_cleanup_semundo:
 bad_fork_cleanup_audit:
        audit_free(p);
 bad_fork_cleanup_policy:
+       perf_counter_free_task(p);
 #ifdef CONFIG_NUMA
        mpol_put(p->mempolicy);
 bad_fork_cleanup_cgroup:
@@ -1302,8 +1293,7 @@ bad_fork_cleanup_put_domain:
        module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
        atomic_dec(&p->cred->user->processes);
-       put_cred(p->real_cred);
-       put_cred(p->cred);
+       exit_creds(p);
 bad_fork_free:
        free_task(p);
 fork_out:
@@ -1458,20 +1448,20 @@ void __init proc_caches_init(void)
 {
        sighand_cachep = kmem_cache_create("sighand_cache",
                        sizeof(struct sighand_struct), 0,
-                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU,
-                       sighand_ctor);
+                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU|
+                       SLAB_NOTRACK, sighand_ctor);
        signal_cachep = kmem_cache_create("signal_cache",
                        sizeof(struct signal_struct), 0,
-                       SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
        files_cachep = kmem_cache_create("files_cache",
                        sizeof(struct files_struct), 0,
-                       SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
        fs_cachep = kmem_cache_create("fs_cache",
                        sizeof(struct fs_struct), 0,
-                       SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
        mm_cachep = kmem_cache_create("mm_struct",
                        sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
-                       SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+                       SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL);
        vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC);
        mmap_init();
 }