1 files changed, 44 insertions, 0 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
new file mode 100644
index 000000000000..3004d716539d
--- /dev/null
+++ b/arch/x86/kernel/process.c
@@ -0,0 +1,44 @@
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+struct kmem_cache *task_xstate_cachep;
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+        *dst = *src;
+        if (src->thread.xstate) {
+                dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+                                                      GFP_KERNEL);
+                if (!dst->thread.xstate)
+                        return -ENOMEM;
+                WARN_ON((unsigned long)dst->thread.xstate & 15);
+                memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
+        }
+        return 0;
+}
+
+void free_thread_xstate(struct task_struct *tsk)
+{
+        if (tsk->thread.xstate) {
+                kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
+                tsk->thread.xstate = NULL;
+        }
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+        free_thread_xstate(ti->task);
+        free_pages((unsigned long)ti, get_order(THREAD_SIZE));
+}
+
+void arch_task_cache_init(void)
+{
+        task_xstate_cachep =
+                kmem_cache_create("task_xstate", xstate_size,
+                                  __alignof__(union thread_xstate),
+                                  SLAB_PANIC, NULL);
+}