kernel: add linux 4.4 support

Based on 4.4-rc3. Runtime tested on MIPS.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 47701

1 files changed, 536 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.4/220-gc_sections.patch b/target/linux/generic/patches-4.4/220-gc_sections.patch
new file mode 100644
index 0000000000..e89ef77d90
--- /dev/null
+++ b/target/linux/generic/patches-4.4/220-gc_sections.patch
@@ -0,0 +1,536 @@
+From: Felix Fietkau <nbd@openwrt.org>
+
+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@openwrt.org>
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+
+--- a/arch/mips/Makefile
++++ b/arch/mips/Makefile
+@@ -89,10 +89,14 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
+ #
+ cflags-y			+= -G 0 -mno-abicalls -fno-pic -pipe
+ cflags-y			+= -msoft-float
+-LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib
++LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib --gc-sections
+ KBUILD_AFLAGS_MODULE		+= -mlong-calls
+ KBUILD_CFLAGS_MODULE		+= -mlong-calls
+ 
++ifndef CONFIG_FUNCTION_TRACER
++KBUILD_CFLAGS_KERNEL		+= -ffunction-sections -fdata-sections
++endif
++
+ #
+ # pass -msoft-float to GAS if it supports it.  However on newer binutils
+ # (specifically newer than 2.24.51.20140728) we then also need to explicitly
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -69,7 +69,7 @@ SECTIONS
+ 	/* Exception table for data bus errors */
+ 	__dbe_table : {
+ 		__start___dbe_table = .;
+-		*(__dbe_table)
++		KEEP(*(__dbe_table))
+ 		__stop___dbe_table = .;
+ 	}
+ 
+@@ -119,7 +119,7 @@ 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
+@@ -89,7 +89,7 @@
+ #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()
+@@ -97,7 +97,7 @@
+ 
+ #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()
+@@ -105,7 +105,7 @@
+ 
+ #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()
+@@ -114,7 +114,7 @@
+ #ifdef CONFIG_KPROBES
+ #define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
+ 				VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
+-				*(_kprobe_blacklist)			      \
++				KEEP(*(_kprobe_blacklist))		      \
+ 				VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
+ #else
+ #define KPROBE_BLACKLIST()
+@@ -123,10 +123,10 @@
+ #ifdef CONFIG_EVENT_TRACING
+ #define FTRACE_EVENTS()	. = ALIGN(8);					\
+ 			VMLINUX_SYMBOL(__start_ftrace_events) = .;	\
+-			*(_ftrace_events)				\
++			KEEP(*(_ftrace_events))				\
+ 			VMLINUX_SYMBOL(__stop_ftrace_events) = .;	\
+ 			VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .;	\
+-			*(_ftrace_enum_map)				\
++			KEEP(*(_ftrace_enum_map))			\
+ 			VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
+ #else
+ #define FTRACE_EVENTS()
+@@ -134,7 +134,7 @@
+ 
+ #ifdef CONFIG_TRACING
+ #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
+-			 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
++			 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
+ 			 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
+ #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;	\
+ 			 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
+@@ -147,7 +147,7 @@
+ #ifdef CONFIG_FTRACE_SYSCALLS
+ #define TRACE_SYSCALLS() . = ALIGN(8);					\
+ 			 VMLINUX_SYMBOL(__start_syscalls_metadata) = .;	\
+-			 *(__syscalls_metadata)				\
++			 KEEP(*(__syscalls_metadata))			\
+ 			 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
+ #else
+ #define TRACE_SYSCALLS()
+@@ -169,8 +169,8 @@
+ #define _OF_TABLE_1(name)						\
+ 	. = ALIGN(8);							\
+ 	VMLINUX_SYMBOL(__##name##_of_table) = .;			\
+-	*(__##name##_of_table)						\
+-	*(__##name##_of_table_end)
++	KEEP(*(__##name##_of_table))					\
++	KEEP(*(__##name##_of_table_end))
+ 
+ #define CLKSRC_OF_TABLES()	OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
+ #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
+@@ -194,7 +194,7 @@
+ #define KERNEL_DTB()							\
+ 	STRUCT_ALIGN();							\
+ 	VMLINUX_SYMBOL(__dtb_start) = .;				\
+-	*(.dtb.init.rodata)						\
++	KEEP(*(.dtb.init.rodata))					\
+ 	VMLINUX_SYMBOL(__dtb_end) = .;
+ 
+ /* .data section */
+@@ -210,16 +210,17 @@
+ 	/* implement dynamic printk debug */				\
+ 	. = ALIGN(8);                                                   \
+ 	VMLINUX_SYMBOL(__start___jump_table) = .;                       \
+-	*(__jump_table)                                                 \
++	KEEP(*(__jump_table))                                           \
+ 	VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
+ 	. = ALIGN(8);							\
+ 	VMLINUX_SYMBOL(__start___verbose) = .;                          \
+-	*(__verbose)                                                    \
++	KEEP(*(__verbose))                                              \
+ 	VMLINUX_SYMBOL(__stop___verbose) = .;				\
+ 	LIKELY_PROFILE()		       				\
+ 	BRANCH_PROFILE()						\
+ 	TRACE_PRINTKS()							\
+-	TRACEPOINT_STR()
++	TRACEPOINT_STR()                                                \
++	*(.data.[a-zA-Z_]*)
+ 
+ /*
+  * Data section helpers
+@@ -273,35 +274,35 @@
+ 	/* PCI quirks */						\
+ 	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_early) = .;		\
+-		*(.pci_fixup_early)					\
++		KEEP(*(.pci_fixup_early))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_early) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_header) = .;		\
+-		*(.pci_fixup_header)					\
++		KEEP(*(.pci_fixup_header))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_header) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_final) = .;		\
+-		*(.pci_fixup_final)					\
++		KEEP(*(.pci_fixup_final))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_final) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;		\
+-		*(.pci_fixup_enable)					\
++		KEEP(*(.pci_fixup_enable))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;		\
+-		*(.pci_fixup_resume)					\
++		KEEP(*(.pci_fixup_resume))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;	\
+-		*(.pci_fixup_resume_early)				\
++		KEEP(*(.pci_fixup_resume_early))			\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;	\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;		\
+-		*(.pci_fixup_suspend)					\
++		KEEP(*(.pci_fixup_suspend))				\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;		\
+ 		VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;	\
+-		*(.pci_fixup_suspend_late)				\
++		KEEP(*(.pci_fixup_suspend_late))			\
+ 		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\
+ 	}								\
+ 									\
+ 	/* Built-in firmware blobs */					\
+ 	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
+ 		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\
+-		*(.builtin_fw)						\
++		KEEP(*(.builtin_fw))					\
+ 		VMLINUX_SYMBOL(__end_builtin_fw) = .;			\
+ 	}								\
+ 									\
+@@ -310,49 +311,49 @@
+ 	/* Kernel symbol table: Normal symbols */			\
+ 	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
+ 		VMLINUX_SYMBOL(__start___ksymtab) = .;			\
+-		*(SORT(___ksymtab+*))					\
++		KEEP(*(SORT(___ksymtab+*)))				\
+ 		VMLINUX_SYMBOL(__stop___ksymtab) = .;			\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: GPL-only symbols */			\
+ 	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
+ 		VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;		\
+-		*(SORT(___ksymtab_gpl+*))				\
++		KEEP(*(SORT(___ksymtab_gpl+*)))				\
+ 		VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;		\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: Normal unused symbols */		\
+ 	__ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {	\
+ 		VMLINUX_SYMBOL(__start___ksymtab_unused) = .;		\
+-		*(SORT(___ksymtab_unused+*))				\
++		KEEP(*(SORT(___ksymtab_unused+*)))			\
+ 		VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;		\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: GPL-only unused symbols */		\
+ 	__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
+ 		VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;	\
+-		*(SORT(___ksymtab_unused_gpl+*))			\
++		KEEP(*(SORT(___ksymtab_unused_gpl+*)))			\
+ 		VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;	\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: GPL-future-only symbols */		\
+ 	__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
+ 		VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;	\
+-		*(SORT(___ksymtab_gpl_future+*))			\
++		KEEP(*(SORT(___ksymtab_gpl_future+*)))			\
+ 		VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;	\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: Normal symbols */			\
+ 	__kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {		\
+ 		VMLINUX_SYMBOL(__start___kcrctab) = .;			\
+-		*(SORT(___kcrctab+*))					\
++		KEEP(*(SORT(___kcrctab+*)))				\
+ 		VMLINUX_SYMBOL(__stop___kcrctab) = .;			\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: GPL-only symbols */			\
+ 	__kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {	\
+ 		VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;		\
+-		*(SORT(___kcrctab_gpl+*))				\
++		KEEP(*(SORT(___kcrctab_gpl+*)))				\
+ 		VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;		\
+ 	}								\
+ 									\
+@@ -366,14 +367,14 @@
+ 	/* Kernel symbol table: GPL-only unused symbols */		\
+ 	__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
+ 		VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;	\
+-		*(SORT(___kcrctab_unused_gpl+*))			\
++		KEEP(*(SORT(___kcrctab_unused_gpl+*)))			\
+ 		VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;	\
+ 	}								\
+ 									\
+ 	/* Kernel symbol table: GPL-future-only symbols */		\
+ 	__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
+ 		VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;	\
+-		*(SORT(___kcrctab_gpl_future+*))			\
++		KEEP(*(SORT(___kcrctab_gpl_future+*)))			\
+ 		VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;	\
+ 	}								\
+ 									\
+@@ -392,14 +393,14 @@
+ 	/* Built-in module parameters. */				\
+ 	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
+ 		VMLINUX_SYMBOL(__start___param) = .;			\
+-		*(__param)						\
++		KEEP(*(__param))					\
+ 		VMLINUX_SYMBOL(__stop___param) = .;			\
+ 	}								\
+ 									\
+ 	/* Built-in module versions. */					\
+ 	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
+ 		VMLINUX_SYMBOL(__start___modver) = .;			\
+-		*(__modver)						\
++		KEEP(*(__modver))					\
+ 		VMLINUX_SYMBOL(__stop___modver) = .;			\
+ 		. = ALIGN((align));					\
+ 		VMLINUX_SYMBOL(__end_rodata) = .;			\
+@@ -453,7 +454,7 @@
+ #define ENTRY_TEXT							\
+ 		ALIGN_FUNCTION();					\
+ 		VMLINUX_SYMBOL(__entry_text_start) = .;			\
+-		*(.entry.text)						\
++		KEEP(*(.entry.text))					\
+ 		VMLINUX_SYMBOL(__entry_text_end) = .;
+ 
+ #ifdef CONFIG_FUNCTION_GRAPH_TRACER
+@@ -481,7 +482,7 @@
+ 	. = ALIGN(align);						\
+ 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
+ 		VMLINUX_SYMBOL(__start___ex_table) = .;			\
+-		*(__ex_table)						\
++		KEEP(*(__ex_table))						\
+ 		VMLINUX_SYMBOL(__stop___ex_table) = .;			\
+ 	}
+ 
+@@ -497,9 +498,9 @@
+ #ifdef CONFIG_CONSTRUCTORS
+ #define KERNEL_CTORS()	. = ALIGN(8);			   \
+ 			VMLINUX_SYMBOL(__ctors_start) = .; \
+-			*(.ctors)			   \
++			KEEP(*(.ctors))			   \
+ 			*(SORT(.init_array.*))		   \
+-			*(.init_array)			   \
++			KEEP(*(.init_array))		   \
+ 			VMLINUX_SYMBOL(__ctors_end) = .;
+ #else
+ #define KERNEL_CTORS()
+@@ -552,7 +553,7 @@
+ #define SBSS(sbss_align)						\
+ 	. = ALIGN(sbss_align);						\
+ 	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
+-		*(.sbss)						\
++		*(.sbss .sbss.*)					\
+ 		*(.scommon)						\
+ 	}
+ 
+@@ -570,7 +571,7 @@
+ 		BSS_FIRST_SECTIONS					\
+ 		*(.bss..page_aligned)					\
+ 		*(.dynbss)						\
+-		*(.bss)							\
++		*(.bss .bss.*)						\
+ 		*(COMMON)						\
+ 	}
+ 
+@@ -619,7 +620,7 @@
+ 	. = ALIGN(8);							\
+ 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
+ 		VMLINUX_SYMBOL(__start___bug_table) = .;		\
+-		*(__bug_table)						\
++		KEEP(*(__bug_table))					\
+ 		VMLINUX_SYMBOL(__stop___bug_table) = .;			\
+ 	}
+ #else
+@@ -631,7 +632,7 @@
+ 	. = ALIGN(4);							\
+ 	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
+ 		VMLINUX_SYMBOL(__tracedata_start) = .;			\
+-		*(.tracedata)						\
++		KEEP(*(.tracedata))					\
+ 		VMLINUX_SYMBOL(__tracedata_end) = .;			\
+ 	}
+ #else
+@@ -648,17 +649,17 @@
+ #define INIT_SETUP(initsetup_align)					\
+ 		. = ALIGN(initsetup_align);				\
+ 		VMLINUX_SYMBOL(__setup_start) = .;			\
+-		*(.init.setup)						\
++		KEEP(*(.init.setup))					\
+ 		VMLINUX_SYMBOL(__setup_end) = .;
+ 
+ #define INIT_CALLS_LEVEL(level)						\
+ 		VMLINUX_SYMBOL(__initcall##level##_start) = .;		\
+-		*(.initcall##level##.init)				\
+-		*(.initcall##level##s.init)				\
++		KEEP(*(.initcall##level##.init))			\
++		KEEP(*(.initcall##level##s.init))			\
+ 
+ #define INIT_CALLS							\
+ 		VMLINUX_SYMBOL(__initcall_start) = .;			\
+-		*(.initcallearly.init)					\
++		KEEP(*(.initcallearly.init))				\
+ 		INIT_CALLS_LEVEL(0)					\
+ 		INIT_CALLS_LEVEL(1)					\
+ 		INIT_CALLS_LEVEL(2)					\
+@@ -672,21 +673,21 @@
+ 
+ #define CON_INITCALL							\
+ 		VMLINUX_SYMBOL(__con_initcall_start) = .;		\
+-		*(.con_initcall.init)					\
++		KEEP(*(.con_initcall.init))				\
+ 		VMLINUX_SYMBOL(__con_initcall_end) = .;
+ 
+ #define SECURITY_INITCALL						\
+ 		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
+-		*(.security_initcall.init)				\
++		KEEP(*(.security_initcall.init))			\
+ 		VMLINUX_SYMBOL(__security_initcall_end) = .;
+ 
+ #ifdef CONFIG_BLK_DEV_INITRD
+ #define INIT_RAM_FS							\
+ 	. = ALIGN(4);							\
+ 	VMLINUX_SYMBOL(__initramfs_start) = .;				\
+-	*(.init.ramfs)							\
++	KEEP(*(.init.ramfs))						\
+ 	. = ALIGN(8);							\
+-	*(.init.ramfs.info)
++	KEEP(*(.init.ramfs.info))
+ #else
+ #define INIT_RAM_FS
+ #endif
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -22,11 +22,16 @@ endif
+ ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
+ LDFLAGS_MODULE	+= -T $(srctree)/arch/arm/kernel/module.lds
+ endif
++LDFLAGS_vmlinux += --gc-sections
+ 
+ OBJCOPYFLAGS	:=-O binary -R .comment -S
+ GZFLAGS		:=-9
+ #KBUILD_CFLAGS	+=-pipe
+ 
++ifndef CONFIG_FUNCTION_TRACER
++KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
++endif
++
+ # Never generate .eh_frame
+ KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
+ 
+--- a/arch/arm/kernel/vmlinux.lds.S
++++ b/arch/arm/kernel/vmlinux.lds.S
+@@ -15,13 +15,13 @@
+ #define PROC_INFO							\
+ 	. = ALIGN(4);							\
+ 	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
+-	*(.proc.info.init)						\
++	KEEP(*(.proc.info.init))					\
+ 	VMLINUX_SYMBOL(__proc_info_end) = .;
+ 
+ #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) = .;			\
+@@ -102,7 +102,7 @@ SECTIONS
+ 		_stext = .;		/* Text and read-only data	*/
+ 			IDMAP_TEXT
+ 			__exception_text_start = .;
+-			*(.exception.text)
++			KEEP(*(.exception.text))
+ 			__exception_text_end = .;
+ 			IRQENTRY_TEXT
+ 			TEXT_TEXT
+@@ -126,7 +126,7 @@ SECTIONS
+ 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+ 		__start___ex_table = .;
+ #ifdef CONFIG_MMU
+-		*(__ex_table)
++		KEEP(*(__ex_table))
+ #endif
+ 		__stop___ex_table = .;
+ 	}
+@@ -138,12 +138,12 @@ 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
+@@ -166,14 +166,14 @@ SECTIONS
+ 	 */
+ 	__vectors_start = .;
+ 	.vectors 0 : AT(__vectors_start) {
+-		*(.vectors)
++		KEEP(*(.vectors))
+ 	}
+ 	. = __vectors_start + SIZEOF(.vectors);
+ 	__vectors_end = .;
+ 
+ 	__stubs_start = .;
+ 	.stubs 0x1000 : AT(__stubs_start) {
+-		*(.stubs)
++		KEEP(*(.stubs))
+ 	}
+ 	. = __stubs_start + SIZEOF(.stubs);
+ 	__stubs_end = .;
+@@ -187,24 +187,24 @@ 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/arm/boot/compressed/Makefile
++++ b/arch/arm/boot/compressed/Makefile
+@@ -105,6 +105,7 @@ 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))
+ 
+ ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
+ asflags-y := -DZIMAGE