kernel: Copy patches from kernel 4.14 to 4.19

This just copies the files from the kernel 4.14 specific folders into
the kernel 4.19 specific folder, no changes are done to the files in
this commit.

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

1 files changed, 258 insertions, 0 deletions

diff --git a/target/linux/generic/hack-4.19/220-gc_sections.patch b/target/linux/generic/hack-4.19/220-gc_sections.patch
new file mode 100644
index 0000000000..d257232403
--- /dev/null
+++ b/target/linux/generic/hack-4.19/220-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
+@@ -272,6 +272,11 @@ else
+ scripts/Kbuild.include: ;
+ include scripts/Kbuild.include
+ 
++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)
+@@ -788,11 +793,6 @@ 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
+@@ -40,6 +40,7 @@ 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)						\
+ 	}
+