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-rw-r--r--target/linux/generic/patches-3.13/220-gc_sections.patch456
1 files changed, 456 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.13/220-gc_sections.patch b/target/linux/generic/patches-3.13/220-gc_sections.patch
new file mode 100644
index 0000000000..76a4f80120
--- /dev/null
+++ b/target/linux/generic/patches-3.13/220-gc_sections.patch
@@ -0,0 +1,456 @@
+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
++
+ cflags-y += -ffreestanding
+
+ #
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -67,7 +67,7 @@ SECTIONS
+ /* Exception table for data bus errors */
+ __dbe_table : {
+ __start___dbe_table = .;
+- *(__dbe_table)
++ KEEP(*(__dbe_table))
+ __stop___dbe_table = .;
+ }
+
+@@ -112,7 +112,7 @@ 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
+@@ -87,7 +87,7 @@
+ #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()
+@@ -95,7 +95,7 @@
+
+ #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()
+@@ -103,7 +103,7 @@
+
+ #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()
+@@ -112,7 +112,7 @@
+ #ifdef CONFIG_EVENT_TRACING
+ #define FTRACE_EVENTS() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__start_ftrace_events) = .; \
+- *(_ftrace_events) \
++ KEEP(*(_ftrace_events)) \
+ VMLINUX_SYMBOL(__stop_ftrace_events) = .;
+ #else
+ #define FTRACE_EVENTS()
+@@ -120,7 +120,7 @@
+
+ #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 */ \
+@@ -133,7 +133,7 @@
+ #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()
+@@ -142,8 +142,8 @@
+ #ifdef CONFIG_CLKSRC_OF
+ #define CLKSRC_OF_TABLES() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__clksrc_of_table) = .; \
+- *(__clksrc_of_table) \
+- *(__clksrc_of_table_end)
++ KEEP(*(__clksrc_of_table)) \
++ KEEP(*(__clksrc_of_table_end))
+ #else
+ #define CLKSRC_OF_TABLES()
+ #endif
+@@ -152,8 +152,8 @@
+ #define IRQCHIP_OF_MATCH_TABLE() \
+ . = ALIGN(8); \
+ VMLINUX_SYMBOL(__irqchip_begin) = .; \
+- *(__irqchip_of_table) \
+- *(__irqchip_of_end)
++ KEEP(*(__irqchip_of_table)) \
++ KEEP(*(__irqchip_of_end))
+ #else
+ #define IRQCHIP_OF_MATCH_TABLE()
+ #endif
+@@ -161,8 +161,8 @@
+ #ifdef CONFIG_COMMON_CLK
+ #define CLK_OF_TABLES() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__clk_of_table) = .; \
+- *(__clk_of_table) \
+- *(__clk_of_table_end)
++ KEEP(*(__clk_of_table)) \
++ KEEP(*(__clk_of_table_end))
+ #else
+ #define CLK_OF_TABLES()
+ #endif
+@@ -170,7 +170,7 @@
+ #define KERNEL_DTB() \
+ STRUCT_ALIGN(); \
+ VMLINUX_SYMBOL(__dtb_start) = .; \
+- *(.dtb.init.rodata) \
++ KEEP(*(.dtb.init.rodata)) \
+ VMLINUX_SYMBOL(__dtb_end) = .;
+
+ /* .data section */
+@@ -186,16 +186,17 @@
+ /* 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
+@@ -249,32 +250,32 @@
+ /* 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) = .; \
+ } \
+ \
+ /* 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) = .; \
+ } \
+ \
+@@ -283,49 +284,49 @@
+ /* 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) = .; \
+ } \
+ \
+@@ -339,14 +340,14 @@
+ /* 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) = .; \
+ } \
+ \
+@@ -365,14 +366,14 @@
+ /* 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) = .; \
+@@ -428,7 +429,7 @@
+ #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
+@@ -456,7 +457,7 @@
+ . = 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) = .; \
+ }
+
+@@ -472,8 +473,8 @@
+ #ifdef CONFIG_CONSTRUCTORS
+ #define KERNEL_CTORS() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__ctors_start) = .; \
+- *(.ctors) \
+- *(.init_array) \
++ KEEP(*(.ctors)) \
++ KEEP(*(.init_array)) \
+ VMLINUX_SYMBOL(__ctors_end) = .;
+ #else
+ #define KERNEL_CTORS()
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -18,11 +18,16 @@ ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
+ LDFLAGS_vmlinux += --be8
+ LDFLAGS_MODULE += --be8
+ 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
+@@ -12,13 +12,13 @@
+ #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(32); \
+ VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
+@@ -93,7 +93,7 @@ SECTIONS
+ .text : { /* Real text segment */
+ _stext = .; /* Text and read-only data */
+ __exception_text_start = .;
+- *(.exception.text)
++ KEEP(*(.exception.text))
+ __exception_text_end = .;
+ IRQENTRY_TEXT
+ TEXT_TEXT
+@@ -118,7 +118,7 @@ SECTIONS
+ __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+ __start___ex_table = .;
+ #ifdef CONFIG_MMU
+- *(__ex_table)
++ KEEP(*(__ex_table))
+ #endif
+ __stop___ex_table = .;
+ }
+@@ -130,12 +130,12 @@ 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
+@@ -154,14 +154,14 @@ 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 = .;
+@@ -175,24 +175,24 @@ 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
+@@ -120,6 +120,7 @@ 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