diff -puN drivers/mtd/nand/nandsim.c~mtd-nandsim-fix-typo-struct-nandsin_geometry drivers/mtd/nand/nandsim.c
--- a/drivers/mtd/nand/nandsim.c~mtd-nandsim-fix-typo-struct-nandsin_geometry
+++ a/drivers/mtd/nand/nandsim.c
@@ -315,7 +315,7 @@ struct nandsim {
 	union ns_mem buf;
 
 	/* NAND flash "geometry" */
-	struct nandsin_geometry {
+	struct {
 		uint64_t totsz;     /* total flash size, bytes */
 		uint32_t secsz;     /* flash sector (erase block) size, bytes */
 		uint pgsz;          /* NAND flash page size, bytes */