kernel: remove old "rootfs" splitter

A year ago I made this old splitter obsolete (see r42828), it's time to
completely remove it now. For all this time we got these warnings:
"Dedicated partitioner didn't create "rootfs_data" partition, please fill a bug report!"
and
"Support for built-in "rootfs_data" splitter will be removed, please use CONFIG_MTD_SPLIT_SQUASHFS_ROOT"
but I'm not aware of any bug reports related to that.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 47040

target/linux/generic/config-4.1

@@ -2344,7 +2344,6 @@ CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK=-1
 # CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED is not set
 # CONFIG_MTD_ROM is not set
 CONFIG_MTD_ROOTFS_ROOT_DEV=y
-CONFIG_MTD_ROOTFS_SPLIT=y
 # CONFIG_MTD_SLRAM is not set
 # CONFIG_MTD_SM_COMMON is not set
 # CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set

target/linux/generic/patches-4.1/406-mtd-old-rootfs-squashfs-splitter.patch

@@ -1,76 +0,0 @@
---- a/drivers/mtd/Kconfig
-+++ b/drivers/mtd/Kconfig
-@@ -18,6 +18,11 @@ config MTD_ROOTFS_ROOT_DEV
- 	bool "Automatically set 'rootfs' partition to be root filesystem"
- 	default y
- 
-+config MTD_ROOTFS_SPLIT
-+	bool "Automatically split 'rootfs' partition for squashfs"
-+	select MTD_SPLIT
-+	default y
-+
- config MTD_SPLIT_FIRMWARE
- 	bool "Automatically split firmware partition for kernel+rootfs"
- 	default y
---- a/drivers/mtd/mtdpart.c
-+++ b/drivers/mtd/mtdpart.c
-@@ -696,6 +696,47 @@ mtd_pad_erasesize(struct mtd_info *mtd,
- 	return len;
- }
- 
-+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
-+{
-+	size_t squashfs_len;
-+	int len, ret;
-+
-+	ret = mtd_get_squashfs_len(master, offset, &squashfs_len);
-+	if (ret)
-+		return ret;
-+
-+	len = mtd_pad_erasesize(master, offset, squashfs_len);
-+	*split_offset = offset + len;
-+
-+	return 0;
-+}
-+
-+static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part)
-+{
-+	unsigned int split_offset = 0;
-+	unsigned int split_size;
-+	int ret;
-+
-+	ret = split_squashfs(master, part->offset, &split_offset);
-+	if (ret)
-+		return;
-+
-+	if (split_offset <= 0)
-+		return;
-+
-+	if (config_enabled(CONFIG_MTD_SPLIT_SQUASHFS_ROOT))
-+		pr_err("Dedicated partitioner didn't create \"rootfs_data\" partition, please fill a bug report!\n");
-+	else
-+		pr_warn("Support for built-in \"rootfs_data\" splitter will be removed, please use CONFIG_MTD_SPLIT_SQUASHFS_ROOT\n");
-+
-+	split_size = part->mtd.size - (split_offset - part->offset);
-+	printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n",
-+		ROOTFS_SPLIT_NAME, split_offset, split_size);
-+
-+	__mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset,
-+			    split_size, false);
-+}
-+
- #define UBOOT_MAGIC	0x27051956
- 
- static void split_uimage(struct mtd_info *master, struct mtd_part *part)
-@@ -758,7 +799,10 @@ static void mtd_partition_split(struct m
- 		return;
- 
- 	if (!strcmp(part->mtd.name, "rootfs")) {
--		run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
-+		int num = run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
-+
-+		if (num <= 0 && config_enabled(CONFIG_MTD_ROOTFS_SPLIT))
-+			split_rootfs_data(master, part);
- 
- 		rootfs_found = 1;
- 	}

target/linux/generic/patches-4.1/430-mtd-add-myloader-partition-parser.patch

@@ -1,6 +1,6 @@
 --- a/drivers/mtd/Kconfig
 +++ b/drivers/mtd/Kconfig
-@@ -184,6 +184,22 @@ config MTD_BCM47XX_PARTS
+@@ -179,6 +179,22 @@ config MTD_BCM47XX_PARTS
  	  This provides partitions parser for devices based on BCM47xx
  	  boards.