x86, fpu: split FPU state from task struct - v5

[linux-2.6-block.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 9c042f901570e1b789d40fdbda111739c733cdb4..44a18192c420e85dd3ef8f904cbd9e1db573b553 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -132,6 +132,10 @@ void __put_task_struct(struct task_struct *tsk)
                free_task(tsk);
 }
 
+void __attribute__((weak)) arch_task_cache_init(void)
+{
+}
+
 void __init fork_init(unsigned long mempages)
 {
 #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
@@ -144,6 +148,9 @@ void __init fork_init(unsigned long mempages)
                        ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL);
 #endif
 
+       /* do the arch specific task caches init */
+       arch_task_cache_init();
+
        /*
         * The default maximum number of threads is set to a safe
         * value: the thread structures can take up at most half
@@ -163,6 +170,13 @@ void __init fork_init(unsigned long mempages)
                init_task.signal->rlim[RLIMIT_NPROC];
 }
 
+int __attribute__((weak)) arch_dup_task_struct(struct task_struct *dst,
+                                              struct task_struct *src)
+{
+       *dst = *src;
+       return 0;
+}
+
 static struct task_struct *dup_task_struct(struct task_struct *orig)
 {
        struct task_struct *tsk;
@@ -181,15 +195,15 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
                return NULL;
        }
 
-       *tsk = *orig;
+       err = arch_dup_task_struct(tsk, orig);
+       if (err)
+               goto out;
+
        tsk->stack = ti;
 
        err = prop_local_init_single(&tsk->dirties);
-       if (err) {
-               free_thread_info(ti);
-               free_task_struct(tsk);
-               return NULL;
-       }
+       if (err)
+               goto out;
 
        setup_thread_stack(tsk, orig);
 
@@ -205,6 +219,11 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 #endif
        tsk->splice_pipe = NULL;
        return tsk;
+
+out:
+       free_thread_info(ti);
+       free_task_struct(tsk);
+       return NULL;
 }
 
 #ifdef CONFIG_MMU