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   1 #include <linux/mm.h>
   2 #include <linux/kernel.h>
   3 #include <linux/sched.h>
   4
   5 #if THREAD_SHIFT < PAGE_SHIFT
   6 static struct kmem_cache *thread_info_cache;
   7
   8 struct thread_info *alloc_thread_info(struct task_struct *tsk)
   9 {
  10         struct thread_info *ti;
  11
  12         ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
  13         if (unlikely(ti == NULL))
  14                 return NULL;
  15 #ifdef CONFIG_DEBUG_STACK_USAGE
  16         memset(ti, 0, THREAD_SIZE);
  17 #endif
  18         return ti;
  19 }
  20
  21 void free_thread_info(struct thread_info *ti)
  22 {
  23         kmem_cache_free(thread_info_cache, ti);
  24 }
  25
  26 void thread_info_cache_init(void)
  27 {
  28         thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
  29                                               THREAD_SIZE, SLAB_PANIC, NULL);
  30 }
  31 #else
  32 struct thread_info *alloc_thread_info(struct task_struct *tsk)
  33 {
  34 #ifdef CONFIG_DEBUG_STACK_USAGE
  35         gfp_t mask = GFP_KERNEL | __GFP_ZERO;
  36 #else
  37         gfp_t mask = GFP_KERNEL;
  38 #endif
  39         return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER);
  40 }
  41
  42 void free_thread_info(struct thread_info *ti)
  43 {
  44         free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
  45 }
  46 #endif /* THREAD_SHIFT < PAGE_SHIFT */