advice on checkpatch error

[jim.cromie at gmail.com]

so I have this macro, with some helpers,
the helper gets a checkpatch error.

    DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_gvt, __gvt_debug,
            "i915/gvt bitmap desc",
            /* map each bit to a category */
            _DD_cat_(0, "gvt:cmd:"),
            _DD_cat_(1, "gvt:core:"),
            _DD_cat_(2, "gvt:dpy:"),
            _DD_cat_(3, "gvt:el:"),
            _DD_cat_(4, "gvt:irq:"),
            _DD_cat_(5, "gvt:mm:"),
            _DD_cat_(6, "gvt:mmio:"),


+#if defined(CONFIG_DYNAMIC_DEBUG) || \
+       (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
+/**
+ * DEFINE_DYNAMIC_DEBUG_CATEGORIES() - bitmap control of categorized prdbgs
+ * @fsname: parameter basename under /sys
+ * @_var:    C-identifier holding bitmap
+ * @desc:  string summarizing the controls provided
+ * @...:    list of struct dyndbg_bitdesc initializations
+ *
+ * Intended for modules with substantial use of "categorized" prdbgs
+ * (those with some systematic prefix in the format string), this lets
+ * modules using pr_debug to control them in groups according to their
+ * format prefixes, and map them to bits 0-N of a sysfs control point.
+ * Each @... gives the index and prefix map.
+ */
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, _var, desc, ...)       \
+       MODULE_PARM_DESC(fsname, desc);                                 \
+       static struct dyndbg_bitmap_param ddcats_##_var =               \
+       { .bits = &(_var), .map = { __VA_ARGS__, { .match = NULL }}};   \
+       module_param_cb(fsname, &param_ops_dyndbg, &ddcats_##_var, 0644)
+
+/* helper macros provide combos of '^' anchor and ' ' postfix */
+#define _DD_cat_(N, str)       [N] = { .match = str " " }
+#define _DD_cats_(N, str)      [N] = { .match = str }
+#define _DD_pfx_(N, str)       [N] = { .match = "^" str " " }
+#define _DD_pfxs_(N, str)      [N] = { .match = "^" str }
+

ERROR: space prohibited before open square bracket '['
#250: FILE: include/linux/dynamic_debug.h:273:
+#define _DD_cat_(N, str) [N] = { .match = str " " }

Ive tried various (encapsulations) to no avail.

what am I missing ?