libata-sff: ata_sff_[dumb_]qc_prep are BMDMA specific

[safe/jmp/linux-2.6] / include / linux / flex_array.h

diff --git a/include/linux/flex_array.h b/include/linux/flex_array.h
index f12401e..1d747f7 100644 (file)
--- a/include/linux/flex_array.h
+++ b/include/linux/flex_array.h
@@ -31,10 +31,32 @@ struct flex_array {
        };
 };
 
-#define FLEX_ARRAY_INIT(size, total) { { {\
-       .element_size = (size),         \
-       .total_nr_elements = (total),   \
-} } }
+/* Number of bytes left in base struct flex_array, excluding metadata */
+#define FLEX_ARRAY_BASE_BYTES_LEFT                                     \
+       (FLEX_ARRAY_BASE_SIZE - offsetof(struct flex_array, parts))
+
+/* Number of pointers in base to struct flex_array_part pages */
+#define FLEX_ARRAY_NR_BASE_PTRS                                                \
+       (FLEX_ARRAY_BASE_BYTES_LEFT / sizeof(struct flex_array_part *))
+
+/* Number of elements of size that fit in struct flex_array_part */
+#define FLEX_ARRAY_ELEMENTS_PER_PART(size)                             \
+       (FLEX_ARRAY_PART_SIZE / size)
+
+/*
+ * Defines a statically allocated flex array and ensures its parameters are
+ * valid.
+ */
+#define DEFINE_FLEX_ARRAY(__arrayname, __element_size, __total)                \
+       struct flex_array __arrayname = { { {                           \
+               .element_size = (__element_size),                       \
+               .total_nr_elements = (__total),                         \
+       } } };                                                          \
+       static inline void __arrayname##_invalid_parameter(void)        \
+       {                                                               \
+               BUILD_BUG_ON((__total) > FLEX_ARRAY_NR_BASE_PTRS *      \
+                       FLEX_ARRAY_ELEMENTS_PER_PART(__element_size));  \
+       }
 
 struct flex_array *flex_array_alloc(int element_size, unsigned int total,
                gfp_t flags);