kernel: generic: Add kernel 4.14 support

This adds initial support for kernel 4.14 based on the patches for
kernel 4.9.

In the configuration I deactivated some of the new possible security
features like:
CONFIG_REFCOUNT_FULL
CONFIG_SLAB_FREELIST_HARDENED
CONFIG_SOFTLOCKUP_DETECTOR
CONFIG_WARN_ALL_UNSEEDED_RANDOM

And these overlay FS options are also deactivated:
CONFIG_OVERLAY_FS_INDEX
CONFIG_OVERLAY_FS_REDIRECT_DIR

I activated this:
CONFIG_FORTIFY_SOURCE
CONFIG_POSIX_TIMERS
CONFIG_SLAB_MERGE_DEFAULT
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED

I am not sure if I did the porting correct for the following patches:
target/linux/generic/backport-4.14/020-backport_netfilter_rtcache.patch
target/linux/generic/hack-4.14/220-gc_sections.patch
target/linux/generic/hack-4.14/321-powerpc_crtsavres_prereq.patch
target/linux/generic/pending-4.14/305-mips_module_reloc.patch
target/linux/generic/pending-4.14/611-netfilter_match_bypass_default_table.patch
target/linux/generic/pending-4.14/680-NET-skip-GRO-for-foreign-MAC-addresses.patch

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 73 insertions, 0 deletions

diff --git a/target/linux/generic/pending-4.14/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch b/target/linux/generic/pending-4.14/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
new file mode 100644
index 0000000000..523a69c873
--- /dev/null
+++ b/target/linux/generic/pending-4.14/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
@@ -0,0 +1,73 @@
+From: Daniel Golle <daniel@makrotopia.org>
+Subject: ubi: auto-attach mtd device named "ubi" or "data" on boot
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
+ 1 file changed, 36 insertions(+)
+
+--- a/drivers/mtd/ubi/build.c
++++ b/drivers/mtd/ubi/build.c
+@@ -1157,6 +1157,49 @@ static struct mtd_info * __init open_mtd
+ 	return mtd;
+ }
+ 
++/*
++ * This function tries attaching mtd partitions named either "ubi" or "data"
++ * during boot.
++ */
++static void __init ubi_auto_attach(void)
++{
++	int err;
++	struct mtd_info *mtd;
++
++	/* try attaching mtd device named "ubi" or "data" */
++	mtd = open_mtd_device("ubi");
++	if (IS_ERR(mtd))
++		mtd = open_mtd_device("data");
++
++	if (!IS_ERR(mtd)) {
++		size_t len;
++		char magic[4];
++
++		/* check for a valid ubi magic */
++		err = mtd_read(mtd, 0, 4, &len, (void *) magic);
++		if (!err && len == 4 && strncmp(magic, "UBI#", 4)) {
++			pr_err("UBI error: no valid UBI magic found inside mtd%d", mtd->index);
++			put_mtd_device(mtd);
++			return;
++		}
++
++		/* auto-add only media types where UBI makes sense */
++		if (mtd->type == MTD_NANDFLASH ||
++		    mtd->type == MTD_NORFLASH ||
++		    mtd->type == MTD_DATAFLASH ||
++		    mtd->type == MTD_MLCNANDFLASH) {
++			mutex_lock(&ubi_devices_mutex);
++			pr_notice("UBI: auto-attach mtd%d\n", mtd->index);
++			err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0);
++			mutex_unlock(&ubi_devices_mutex);
++			if (err < 0) {
++				pr_err("UBI error: cannot attach mtd%d", mtd->index);
++				put_mtd_device(mtd);
++			}
++		}
++	}
++}
++
+ static int __init ubi_init(void)
+ {
+ 	int err, i, k;
+@@ -1240,6 +1283,12 @@ static int __init ubi_init(void)
+ 		}
+ 	}
+ 
++	/* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
++	 * parameter was given */
++	if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
++	    !ubi_is_module() && !mtd_devs)
++		ubi_auto_attach();
++
+ 	err = ubiblock_init();
+ 	if (err) {
+ 		pr_err("UBI error: block: cannot initialize, error %d\n", err);