iommu: export iommu_is_span_boundary helper function
[linux-2.6.git] / lib / iommu-helper.c
index 495575a..a3b8d4c 100644 (file)
@@ -40,10 +40,12 @@ static inline void set_bit_area(unsigned long *map, unsigned long i,
        }
 }
 
-static inline int is_span_boundary(unsigned int index, unsigned int nr,
-                                  unsigned long shift,
-                                  unsigned long boundary_size)
+int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+                          unsigned long shift,
+                          unsigned long boundary_size)
 {
+       BUG_ON(!is_power_of_2(boundary_size));
+
        shift = (shift + index) & (boundary_size - 1);
        return shift + nr > boundary_size;
 }
@@ -57,7 +59,7 @@ unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 again:
        index = find_next_zero_area(map, size, start, nr, align_mask);
        if (index != -1) {
-               if (is_span_boundary(index, nr, shift, boundary_size)) {
+               if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
                        /* we could do more effectively */
                        start = index + 1;
                        goto again;