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 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         if (src->thread.xstate) {
  14                 dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
  15                                                       GFP_KERNEL);
  16                 if (!dst->thread.xstate)
  17                         return -ENOMEM;
  18                 WARN_ON((unsigned long)dst->thread.xstate & 15);
  19                 memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
  20         }
  21         return 0;
  22 }
  23
  24 void free_thread_xstate(struct task_struct *tsk)
  25 {
  26         if (tsk->thread.xstate) {
  27                 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
  28                 tsk->thread.xstate = NULL;
  29         }
  30 }
  31
  32 void free_thread_info(struct thread_info *ti)
  33 {
  34         free_thread_xstate(ti->task);
  35         free_pages((unsigned long)ti, get_order(THREAD_SIZE));
  36 }
  37
  38 void arch_task_cache_init(void)
  39 {
  40         task_xstate_cachep =
  41                 kmem_cache_create("task_xstate", xstate_size,
  42                                   __alignof__(union thread_xstate),
  43                                   SLAB_PANIC, NULL);
  44 }