diff options
Diffstat (limited to 'target/linux/generic/hack-4.9/220-gc_sections.patch')
| -rw-r--r-- | target/linux/generic/hack-4.9/220-gc_sections.patch | 438 |
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 + |