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, 62 insertions, 0 deletions

diff --git a/target/linux/generic/pending-4.14/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch b/target/linux/generic/pending-4.14/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
new file mode 100644
index 0000000000..b9bb3f71f1
--- /dev/null
+++ b/target/linux/generic/pending-4.14/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
@@ -0,0 +1,62 @@
+From: Felix Fietkau <nbd@nbd.name>
+Subject: jffs2: use .rename2 and add RENAME_WHITEOUT support
+
+It is required for renames on overlayfs
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/fs/jffs2/dir.c
++++ b/fs/jffs2/dir.c
+@@ -756,6 +756,24 @@ static int jffs2_mknod (struct inode *di
+ 	return ret;
+ }
+ 
++static int jffs2_whiteout (struct inode *old_dir, struct dentry *old_dentry)
++{
++	struct dentry *wh;
++	int err;
++
++	wh = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
++	if (!wh)
++		return -ENOMEM;
++
++	err = jffs2_mknod(old_dir, wh, S_IFCHR | WHITEOUT_MODE,
++			  WHITEOUT_DEV);
++	if (err)
++		return err;
++
++	d_rehash(wh);
++	return 0;
++}
++
+ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
+ 			 struct inode *new_dir_i, struct dentry *new_dentry,
+ 			 unsigned int flags)
+@@ -766,7 +784,7 @@ static int jffs2_rename (struct inode *o
+ 	uint8_t type;
+ 	uint32_t now;
+ 
+-	if (flags & ~RENAME_NOREPLACE)
++	if (flags & ~(RENAME_NOREPLACE|RENAME_WHITEOUT))
+ 		return -EINVAL;
+ 
+ 	/* The VFS will check for us and prevent trying to rename a
+@@ -832,9 +850,14 @@ static int jffs2_rename (struct inode *o
+ 	if (d_is_dir(old_dentry) && !victim_f)
+ 		inc_nlink(new_dir_i);
+ 
+-	/* Unlink the original */
+-	ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
+-			      old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
++	if (flags & RENAME_WHITEOUT)
++		/* Replace with whiteout */
++		ret = jffs2_whiteout(old_dir_i, old_dentry);
++	else
++		/* Unlink the original */
++		ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
++				      old_dentry->d_name.name,
++				      old_dentry->d_name.len, NULL, now);
+ 
+ 	/* We don't touch inode->i_nlink */
+