include/usb/lin_gadget_compat.h

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics
   3  * Lukasz Majewski <l.majewski@samsung.com>
   4  *
   5  * This is a Linux kernel compatibility layer for USB Gadget
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #ifndef __LIN_COMPAT_H__
  11 #define __LIN_COMPAT_H__
  12
  13 #include <linux/compat.h>
  14
  15 /* common */
  16 #define BITS_PER_BYTE                           8
  17 #define BITS_TO_LONGS(nr) \
  18         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
  19 #define DECLARE_BITMAP(name, bits) \
  20         unsigned long name[BITS_TO_LONGS(bits)]
  21
  22 #define small_const_nbits(nbits) \
  23         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  24
  25 static inline void bitmap_zero(unsigned long *dst, int nbits)
  26 {
  27         if (small_const_nbits(nbits))
  28                 *dst = 0UL;
  29         else {
  30                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  31                 memset(dst, 0, len);
  32         }
  33 }
  34
  35 #define dma_cache_maint(addr, size, mode) cache_flush()
  36 void cache_flush(void);
  37
  38 #endif /* __LIN_COMPAT_H__ */