arch/x86/kernel/process.c

   1 #include <linux/errno.h>
   2 #include <linux/kernel.h>
   3 #include <linux/mm.h>
   4 #include <linux/smp.h>
   5 #include <linux/slab.h>
   6 #include <linux/sched.h>
   7
   8 static struct kmem_cache *task_xstate_cachep;
   9
  10 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
  11 {
  12         *dst = *src;
  13         dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
  14         if (!dst->thread.xstate)
  15                 return -ENOMEM;
  16         WARN_ON((unsigned long)dst->thread.xstate & 15);
  17         memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
  18         return 0;
  19 }
  20
  21 void free_thread_info(struct thread_info *ti)
  22 {
  23         kmem_cache_free(task_xstate_cachep, ti->task->thread.xstate);
  24         ti->task->thread.xstate = NULL;
  25
  26         free_pages((unsigned long)(ti), get_order(THREAD_SIZE));
  27 }
  28
  29 void arch_task_cache_init(void)
  30 {
  31         task_xstate_cachep =
  32                 kmem_cache_create("task_xstate", xstate_size,
  33                                   __alignof__(union thread_xstate),
  34                                   SLAB_PANIC, NULL);
  35 }