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-rw-r--r--include/usb/lin_gadget_compat.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/usb/lin_gadget_compat.h b/include/usb/lin_gadget_compat.h
index 8287b9d..5bdcb8d 100644
--- a/include/usb/lin_gadget_compat.h
+++ b/include/usb/lin_gadget_compat.h
@@ -44,6 +44,25 @@
#define ENOTSUPP 524 /* Operation is not supported */
+#define BITS_PER_BYTE 8
+#define BITS_TO_LONGS(nr) \
+ DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define DECLARE_BITMAP(name, bits) \
+ unsigned long name[BITS_TO_LONGS(bits)]
+
+#define small_const_nbits(nbits) \
+ (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
+
+static inline void bitmap_zero(unsigned long *dst, int nbits)
+{
+ if (small_const_nbits(nbits))
+ *dst = 0UL;
+ else {
+ int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
+ memset(dst, 0, len);
+ }
+}
+
#define dma_cache_maint(addr, size, mode) cache_flush()
void cache_flush(void);