mtd: parsers: ofpart: Remove code/data for disabled custom parsers

Currently even if none of the custom parsers are selected a struct
of_device_id and a dummy function that just returns -EOPNOTSUPP is
compiled in for each of them.

Its not obvious from the code but struct of_device_id is massive,
196 or 200 bytes (see link), so this is a lot more wasteful than you'd
think just skimming the code and assuming the wasted size is just the
length of the string with some small overhead.

If they aren't enabled use ifdef's to avoid anything being compiled
in and remove the dummy functions.

Link: https://lore.kernel.org/all/ef59d6fd3b2201b912d5eaa7f7a037d8f9adb744.1636561068.git.geert+renesas@glider.be/
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: fifteenhex

drivers/mtd/parsers/ofpart_bcm4908.h

@@ -4,12 +4,6 @@
 
 #ifdef CONFIG_MTD_OF_PARTS_BCM4908
 int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
-#else
-static inline int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts,
-						int nr_parts)
-{
-	return -EOPNOTSUPP;
-}
 #endif
 
 #endif

drivers/mtd/parsers/ofpart_core.c

@@ -23,13 +23,17 @@ struct fixed_partitions_quirks {
 	int (*post_parse)(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
 };
 
+#ifdef CONFIG_MTD_OF_PARTS_BCM4908
 static struct fixed_partitions_quirks bcm4908_partitions_quirks = {
 	.post_parse = bcm4908_partitions_post_parse,
 };
+#endif
 
+#ifdef CONFIG_MTD_OF_PARTS_LINKSYS_NS
 static struct fixed_partitions_quirks linksys_ns_partitions_quirks = {
 	.post_parse = linksys_ns_partitions_post_parse,
 };
+#endif
 
 static const struct of_device_id parse_ofpart_match_table[];
 
@@ -192,8 +196,12 @@ static const struct of_device_id parse_ofpart_match_table[] = {
 	/* Generic */
 	{ .compatible = "fixed-partitions" },
 	/* Customized */
+#ifdef CONFIG_MTD_OF_PARTS_BCM4908
 	{ .compatible = "brcm,bcm4908-partitions", .data = &bcm4908_partitions_quirks, },
+#endif
+#ifdef CONFIG_MTD_OF_PARTS_LINKSYS_NS
 	{ .compatible = "linksys,ns-partitions", .data = &linksys_ns_partitions_quirks, },
+#endif
 	{},
 };
 MODULE_DEVICE_TABLE(of, parse_ofpart_match_table);

drivers/mtd/parsers/ofpart_linksys_ns.h

@@ -6,13 +6,6 @@
 int linksys_ns_partitions_post_parse(struct mtd_info *mtd,
 				     struct mtd_partition *parts,
 				     int nr_parts);
-#else
-static inline int linksys_ns_partitions_post_parse(struct mtd_info *mtd,
-						   struct mtd_partition *parts,
-						   int nr_parts)
-{
-	return -EOPNOTSUPP;
-}
 #endif
 
 #endif