[patch 7/7] bitmap: add bitmap_copy_le()

bitmap_copy_le() copies a bitmap, putting the bits into little-endian
order (i.e., each unsigned long word in the bitmap is put into
little-endian order).

The UWB stack used bitmaps to manage Medium Access Slot availability,
and these bitmaps need to be written to the hardware in LE order.

Signed-off-by: David Vrabel <[email protected]>

Index: linux-2.6-upstream/include/linux/bitmap.h
===================================================================
--- linux-2.6-upstream.orig/include/linux/bitmap.h	2007-08-02 16:57:40.000000000 +0100
+++ linux-2.6-upstream/include/linux/bitmap.h	2007-08-02 17:00:25.000000000 +0100
@@ -122,6 +122,7 @@
 extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
 extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
 extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
+extern void bitmap_copy_le(unsigned long *dst, const unsigned long *src, int nbits);
 
 #define BITMAP_LAST_WORD_MASK(nbits)					\
 (									\
Index: linux-2.6-upstream/lib/bitmap.c
===================================================================
--- linux-2.6-upstream.orig/lib/bitmap.c	2007-08-02 16:56:00.000000000 +0100
+++ linux-2.6-upstream/lib/bitmap.c	2007-08-02 17:32:02.000000000 +0100
@@ -834,3 +834,23 @@
 	return 0;
 }
 EXPORT_SYMBOL(bitmap_allocate_region);
+
+/**
+ * bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
+ * @dst:   destination bitmap.
+ * @src:   bitmap to copy.
+ * @nbits: number of bits in the bitmap.
+ *
+ * Require nbits % BITS_PER_LONG == 0.
+ */
+void bitmap_copy_le(unsigned long *dst, const unsigned long *src, int nbits)
+{
+	int i;
+
+	for (i = 0; i < nbits/BITS_PER_LONG; i++)
+		if (BITS_PER_LONG == 64)
+			dst[i] = cpu_to_le64(src[i]);
+		else
+			dst[i] = cpu_to_le32(src[i]);
+}
+EXPORT_SYMBOL(bitmap_copy_le);

-- 

Inaky

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