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/bitops.h>
  14 #include <linux/compat.h>
  15
  16 /* common */
  17 #define DECLARE_BITMAP(name, bits) \
  18         unsigned long name[BITS_TO_LONGS(bits)]
  19
  20 #define small_const_nbits(nbits) \
  21         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  22
  23 static inline void bitmap_zero(unsigned long *dst, int nbits)
  24 {
  25         if (small_const_nbits(nbits))
  26                 *dst = 0UL;
  27         else {
  28                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  29                 memset(dst, 0, len);
  30         }
  31 }
  32
  33 #define dma_cache_maint(addr, size, mode) cache_flush()
  34 void cache_flush(void);
  35
  36 #endif /* __LIN_COMPAT_H__ */