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-rw-r--r--target/linux/generic/hack-4.9/220-gc_sections.patch438
1 files changed, 438 insertions, 0 deletions
diff --git a/target/linux/generic/hack-4.9/220-gc_sections.patch b/target/linux/generic/hack-4.9/220-gc_sections.patch
new file mode 100644
index 0000000000..d6f7da0e72
--- /dev/null
+++ b/target/linux/generic/hack-4.9/220-gc_sections.patch
@@ -0,0 +1,438 @@
+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(-)
+
+diff --git a/Makefile b/Makefile
+index 42435dfa5fc3..66cdf6a59b53 100644
+--- 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)))$(EXTRAVERSION)
+@@ -631,11 +636,6 @@ include arch/$(SRCARCH)/Makefile
+ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
+ KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
+
+-ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+-KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
+-KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
+-endif
+-
+ ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
+ KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) $(EXTRA_OPTIMIZATION)
+ else
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index b5d529fdffab..7f69418bf02c 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -81,6 +81,7 @@ config ARM
+ select HAVE_UID16
+ select HAVE_VIRT_CPU_ACCOUNTING_GEN
+ select IRQ_FORCED_THREADING
++ select LD_DEAD_CODE_DATA_ELIMINATION
+ select MODULES_USE_ELF_REL
+ select NO_BOOTMEM
+ select OF_EARLY_FLATTREE if OF
+diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
+index d50430c40045..6bdeb009a46d 100644
+--- a/arch/arm/boot/compressed/Makefile
++++ b/arch/arm/boot/compressed/Makefile
+@@ -102,6 +102,7 @@ ifeq ($(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.
+diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
+index f7f55df0bf7b..e9d70c92d99f 100644
+--- a/arch/arm/kernel/vmlinux.lds.S
++++ b/arch/arm/kernel/vmlinux.lds.S
+@@ -17,7 +17,7 @@
+ #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 \
+@@ -28,11 +28,11 @@
+ #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
+@@ -105,7 +105,7 @@ SECTIONS
+ _stext = .; /* Text and read-only data */
+ IDMAP_TEXT
+ __exception_text_start = .;
+- *(.exception.text)
++ KEEP(*(.exception.text))
+ __exception_text_end = .;
+ IRQENTRY_TEXT
+ SOFTIRQENTRY_TEXT
+@@ -134,7 +134,7 @@ SECTIONS
+ __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+ __start___ex_table = .;
+ #ifdef CONFIG_MMU
+- *(__ex_table)
++ KEEP(*(__ex_table))
+ #endif
+ __stop___ex_table = .;
+ }
+@@ -146,12 +146,12 @@ 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
+@@ -171,14 +171,14 @@ 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 = .;
+@@ -194,24 +194,24 @@ 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 : {
+diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
+index 3a97487b8b81..05e7bfeab2f9 100644
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -55,6 +55,7 @@ config MIPS
+ select CLONE_BACKWARDS
+ select HAVE_DEBUG_STACKOVERFLOW
+ select HAVE_CC_STACKPROTECTOR
++ select LD_DEAD_CODE_DATA_ELIMINATION
+ select CPU_PM if CPU_IDLE
+ select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_BINFMT_ELF_STATE
+diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
+index d5de67591735..de5f682b5597 100644
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -71,7 +71,7 @@ SECTIONS
+ /* Exception table for data bus errors */
+ __dbe_table : {
+ __start___dbe_table = .;
+- *(__dbe_table)
++ KEEP(*(__dbe_table))
+ __stop___dbe_table = .;
+ }
+
+@@ -121,7 +121,7 @@ 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 = .;
+ }
+
+diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
+index 31e1d639abed..83784d9492b1 100644
+--- a/include/asm-generic/vmlinux.lds.h
++++ b/include/asm-generic/vmlinux.lds.h
+@@ -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()
+@@ -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()
+@@ -156,7 +156,7 @@
+ #ifdef CONFIG_SERIAL_EARLYCON
+ #define EARLYCON_TABLE() STRUCT_ALIGN(); \
+ VMLINUX_SYMBOL(__earlycon_table) = .; \
+- *(__earlycon_table) \
++ KEEP(*(__earlycon_table)) \
+ VMLINUX_SYMBOL(__earlycon_table_end) = .;
+ #else
+ #define EARLYCON_TABLE()
+@@ -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)
+@@ -193,7 +193,7 @@
+ #define KERNEL_DTB() \
+ STRUCT_ALIGN(); \
+ VMLINUX_SYMBOL(__dtb_start) = .; \
+- *(.dtb.init.rodata) \
++ KEEP(*(.dtb.init.rodata)) \
+ VMLINUX_SYMBOL(__dtb_end) = .;
+
+ /*
+@@ -214,16 +214,17 @@
+ /* 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
+@@ -291,35 +292,35 @@
+ /* 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) = .; \
+ } \
+ \
+@@ -397,7 +398,7 @@
+ \
+ /* Kernel symbol table: strings */ \
+ __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
+- KEEP(*(__ksymtab_strings)) \
++ *(__ksymtab_strings) \
+ } \
+ \
+ /* __*init sections */ \
+@@ -410,14 +411,14 @@
+ /* 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) = .; \
+@@ -482,7 +483,7 @@
+ #define ENTRY_TEXT \
+ ALIGN_FUNCTION(); \
+ VMLINUX_SYMBOL(__entry_text_start) = .; \
+- *(.entry.text) \
++ KEEP(*(.entry.text)) \
+ VMLINUX_SYMBOL(__entry_text_end) = .;
+
+ #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
+@@ -520,7 +521,7 @@
+ . = 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) = .; \
+ }
+
+@@ -536,9 +537,9 @@
+ #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()
+@@ -595,7 +596,7 @@
+ #define SBSS(sbss_align) \
+ . = ALIGN(sbss_align); \
+ .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
+- *(.sbss) \
++ *(.sbss .sbss.*) \
+ *(.scommon) \
+ }
+
+@@ -662,7 +663,7 @@
+ . = 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
+@@ -674,7 +675,7 @@
+ . = ALIGN(4); \
+ .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__tracedata_start) = .; \
+- *(.tracedata) \
++ KEEP(*(.tracedata)) \
+ VMLINUX_SYMBOL(__tracedata_end) = .; \
+ }
+ #else
+@@ -691,7 +692,7 @@
+ #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) \
+--
+2.11.0
+