mm/cma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MM_CMA_H__
   3 #define __MM_CMA_H__
   4
   5 struct cma {
   6         unsigned long   base_pfn;
   7         unsigned long   count;
   8         unsigned long   *bitmap;
   9         unsigned int order_per_bit; /* Order of pages represented by one bit */
  10         struct mutex    lock;
  11 #ifdef CONFIG_CMA_DEBUGFS
  12         struct hlist_head mem_head;
  13         spinlock_t mem_head_lock;
  14 #endif
  15         const char *name;
  16 };
  17
  18 extern struct cma cma_areas[MAX_CMA_AREAS];
  19 extern unsigned cma_area_count;
  20
  21 static inline unsigned long cma_bitmap_maxno(struct cma *cma)
  22 {
  23         return cma->count >> cma->order_per_bit;
  24 }
  25
  26 #endif