mm/cma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MM_CMA_H__
   3 #define __MM_CMA_H__
   4
   5 #include <linux/debugfs.h>
   6
   7 struct cma {
   8         unsigned long   base_pfn;
   9         unsigned long   count;
  10         unsigned long   *bitmap;
  11         unsigned int order_per_bit; /* Order of pages represented by one bit */
  12         struct mutex    lock;
  13 #ifdef CONFIG_CMA_DEBUGFS
  14         struct hlist_head mem_head;
  15         spinlock_t mem_head_lock;
  16         struct debugfs_u32_array dfs_bitmap;
  17 #endif
  18         char name[CMA_MAX_NAME];
  19 };
  20
  21 extern struct cma cma_areas[MAX_CMA_AREAS];
  22 extern unsigned cma_area_count;
  23
  24 static inline unsigned long cma_bitmap_maxno(struct cma *cma)
  25 {
  26         return cma->count >> cma->order_per_bit;
  27 }
  28
  29 #endif