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, 258 insertions, 0 deletions

diff --git a/target/linux/generic/hack-4.14/220-gc_sections.patch b/target/linux/generic/hack-4.14/220-gc_sections.patch
new file mode 100644
index 0000000000..4463e2313e
--- /dev/null
+++ b/target/linux/generic/hack-4.14/220-gc_sections.patch
@@ -0,0 +1,258 @@
+From e3d8676f5722b7622685581e06e8f53e6138e3ab Mon Sep 17 00:00:00 2001
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sat, 15 Jul 2017 23:42:36 +0200
+Subject: use -ffunction-sections, -fdata-sections and --gc-sections
+
+In combination with kernel symbol export stripping this significantly reduces
+the kernel image size. Used on both ARM and MIPS architectures.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+ Makefile                          | 10 +++----
+ arch/arm/Kconfig                  |  1 +
+ arch/arm/boot/compressed/Makefile |  1 +
+ arch/arm/kernel/vmlinux.lds.S     | 26 ++++++++--------
+ arch/mips/Kconfig                 |  1 +
+ arch/mips/kernel/vmlinux.lds.S    |  4 +--
+ include/asm-generic/vmlinux.lds.h | 63 ++++++++++++++++++++-------------------
+ 7 files changed, 55 insertions(+), 51 deletions(-)
+
+--- a/Makefile
++++ b/Makefile
+@@ -410,6 +410,11 @@ KBUILD_AFLAGS_MODULE  := -DMODULE
+ KBUILD_CFLAGS_MODULE  := -DMODULE
+ KBUILD_LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds $(if $(CONFIG_PROFILING),,-s)
+ 
++ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
++KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-ffunction-sections,)
++KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-fdata-sections,)
++endif
++
+ # Read KERNELRELEASE from include/config/kernel.release (if it exists)
+ KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
+ KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
+@@ -783,11 +788,6 @@ ifdef CONFIG_DEBUG_SECTION_MISMATCH
+ KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
+ endif
+ 
+-ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+-KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
+-KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
+-endif
+-
+ # arch Makefile may override CC so keep this after arch Makefile is included
+ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+ CHECKFLAGS     += $(NOSTDINC_FLAGS)
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -91,6 +91,7 @@ config ARM
+ 	select HAVE_UID16
+ 	select HAVE_VIRT_CPU_ACCOUNTING_GEN
+ 	select IRQ_FORCED_THREADING
++	select LD_DEAD_CODE_DATA_ELIMINATION
+ 	select MODULES_USE_ELF_REL
+ 	select NO_BOOTMEM
+ 	select OF_EARLY_FLATTREE if OF
+--- a/arch/arm/boot/compressed/Makefile
++++ b/arch/arm/boot/compressed/Makefile
+@@ -103,6 +103,7 @@ ifeq ($(CONFIG_FUNCTION_TRACER),y)
+ ORIG_CFLAGS := $(KBUILD_CFLAGS)
+ KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
+ endif
++KBUILD_CFLAGS_KERNEL := $(patsubst -f%-sections,,$(KBUILD_CFLAGS_KERNEL))
+ 
+ # -fstack-protector-strong triggers protection checks in this code,
+ # but it is being used too early to link to meaningful stack_chk logic.
+--- a/arch/arm/kernel/vmlinux.lds.S
++++ b/arch/arm/kernel/vmlinux.lds.S
+@@ -18,7 +18,7 @@
+ #define PROC_INFO							\
+ 	. = ALIGN(4);							\
+ 	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
+-	*(.proc.info.init)						\
++	KEEP(*(.proc.info.init))					\
+ 	VMLINUX_SYMBOL(__proc_info_end) = .;
+ 
+ #define HYPERVISOR_TEXT							\
+@@ -29,11 +29,11 @@
+ #define IDMAP_TEXT							\
+ 	ALIGN_FUNCTION();						\
+ 	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
+-	*(.idmap.text)							\
++	KEEP(*(.idmap.text))						\
+ 	VMLINUX_SYMBOL(__idmap_text_end) = .;				\
+ 	. = ALIGN(PAGE_SIZE);						\
+ 	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;			\
+-	*(.hyp.idmap.text)						\
++	KEEP(*(.hyp.idmap.text))					\
+ 	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
+ 
+ #ifdef CONFIG_HOTPLUG_CPU
+@@ -106,7 +106,7 @@ SECTIONS
+ 		_stext = .;		/* Text and read-only data	*/
+ 			IDMAP_TEXT
+ 			__exception_text_start = .;
+-			*(.exception.text)
++			KEEP(*(.exception.text))
+ 			__exception_text_end = .;
+ 			IRQENTRY_TEXT
+ 			SOFTIRQENTRY_TEXT
+@@ -135,7 +135,7 @@ SECTIONS
+ 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+ 		__start___ex_table = .;
+ #ifdef CONFIG_MMU
+-		*(__ex_table)
++		KEEP(*(__ex_table))
+ #endif
+ 		__stop___ex_table = .;
+ 	}
+@@ -147,12 +147,12 @@ SECTIONS
+ 	. = ALIGN(8);
+ 	.ARM.unwind_idx : {
+ 		__start_unwind_idx = .;
+-		*(.ARM.exidx*)
++		KEEP(*(.ARM.exidx*))
+ 		__stop_unwind_idx = .;
+ 	}
+ 	.ARM.unwind_tab : {
+ 		__start_unwind_tab = .;
+-		*(.ARM.extab*)
++		KEEP(*(.ARM.extab*))
+ 		__stop_unwind_tab = .;
+ 	}
+ #endif
+@@ -172,14 +172,14 @@ SECTIONS
+ 	 */
+ 	__vectors_start = .;
+ 	.vectors 0xffff0000 : AT(__vectors_start) {
+-		*(.vectors)
++		KEEP(*(.vectors))
+ 	}
+ 	. = __vectors_start + SIZEOF(.vectors);
+ 	__vectors_end = .;
+ 
+ 	__stubs_start = .;
+ 	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
+-		*(.stubs)
++		KEEP(*(.stubs))
+ 	}
+ 	. = __stubs_start + SIZEOF(.stubs);
+ 	__stubs_end = .;
+@@ -195,24 +195,24 @@ SECTIONS
+ 	}
+ 	.init.arch.info : {
+ 		__arch_info_begin = .;
+-		*(.arch.info.init)
++		KEEP(*(.arch.info.init))
+ 		__arch_info_end = .;
+ 	}
+ 	.init.tagtable : {
+ 		__tagtable_begin = .;
+-		*(.taglist.init)
++		KEEP(*(.taglist.init))
+ 		__tagtable_end = .;
+ 	}
+ #ifdef CONFIG_SMP_ON_UP
+ 	.init.smpalt : {
+ 		__smpalt_begin = .;
+-		*(.alt.smp.init)
++		KEEP(*(.alt.smp.init))
+ 		__smpalt_end = .;
+ 	}
+ #endif
+ 	.init.pv_table : {
+ 		__pv_table_begin = .;
+-		*(.pv_table)
++		KEEP(*(.pv_table))
+ 		__pv_table_end = .;
+ 	}
+ 	.init.data : {
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -39,6 +39,7 @@ config MIPS
+ 	select HAVE_CBPF_JIT if (!64BIT && !CPU_MICROMIPS)
+ 	select HAVE_EBPF_JIT if (64BIT && !CPU_MICROMIPS)
+ 	select HAVE_CC_STACKPROTECTOR
++	select LD_DEAD_CODE_DATA_ELIMINATION
+ 	select HAVE_CONTEXT_TRACKING
+ 	select HAVE_COPY_THREAD_TLS
+ 	select HAVE_C_RECORDMCOUNT
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -72,7 +72,7 @@ SECTIONS
+ 	/* Exception table for data bus errors */
+ 	__dbe_table : {
+ 		__start___dbe_table = .;
+-		*(__dbe_table)
++		KEEP(*(__dbe_table))
+ 		__stop___dbe_table = .;
+ 	}
+ 
+@@ -123,7 +123,7 @@ SECTIONS
+ 	. = ALIGN(4);
+ 	.mips.machines.init : AT(ADDR(.mips.machines.init) - LOAD_OFFSET) {
+ 		__mips_machines_start = .;
+-		*(.mips.machines.init)
++		KEEP(*(.mips.machines.init))
+ 		__mips_machines_end = .;
+ 	}
+ 
+--- a/include/asm-generic/vmlinux.lds.h
++++ b/include/asm-generic/vmlinux.lds.h
+@@ -105,7 +105,7 @@
+ #ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ #define MCOUNT_REC()	. = ALIGN(8);				\
+ 			VMLINUX_SYMBOL(__start_mcount_loc) = .; \
+-			*(__mcount_loc)				\
++			KEEP(*(__mcount_loc))			\
+ 			VMLINUX_SYMBOL(__stop_mcount_loc) = .;
+ #else
+ #define MCOUNT_REC()
+@@ -113,7 +113,7 @@
+ 
+ #ifdef CONFIG_TRACE_BRANCH_PROFILING
+ #define LIKELY_PROFILE()	VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
+-				*(_ftrace_annotated_branch)			      \
++				KEEP(*(_ftrace_annotated_branch))		      \
+ 				VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
+ #else
+ #define LIKELY_PROFILE()
+@@ -121,7 +121,7 @@
+ 
+ #ifdef CONFIG_PROFILE_ALL_BRANCHES
+ #define BRANCH_PROFILE()	VMLINUX_SYMBOL(__start_branch_profile) = .;   \
+-				*(_ftrace_branch)			      \
++				KEEP(*(_ftrace_branch))			      \
+ 				VMLINUX_SYMBOL(__stop_branch_profile) = .;
+ #else
+ #define BRANCH_PROFILE()
+@@ -237,7 +237,8 @@
+ 	LIKELY_PROFILE()		       				\
+ 	BRANCH_PROFILE()						\
+ 	TRACE_PRINTKS()							\
+-	TRACEPOINT_STR()
++	TRACEPOINT_STR()                                                \
++	*(.data.[a-zA-Z_]*)
+ 
+ /*
+  * Data section helpers
+@@ -496,7 +497,7 @@
+ #define ENTRY_TEXT							\
+ 		ALIGN_FUNCTION();					\
+ 		VMLINUX_SYMBOL(__entry_text_start) = .;			\
+-		*(.entry.text)						\
++		KEEP(*(.entry.text))					\
+ 		VMLINUX_SYMBOL(__entry_text_end) = .;
+ 
+ #define IRQENTRY_TEXT							\
+@@ -603,7 +604,7 @@
+ 	. = ALIGN(sbss_align);						\
+ 	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
+ 		*(.dynsbss)						\
+-		*(.sbss)						\
++		*(.sbss .sbss.*)					\
+ 		*(.scommon)						\
+ 	}
+