diff options
Diffstat (limited to 'target/linux/generic/hack-5.10/220-gc_sections.patch')
| -rw-r--r-- | target/linux/generic/hack-5.10/220-gc_sections.patch | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/target/linux/generic/hack-5.10/220-gc_sections.patch b/target/linux/generic/hack-5.10/220-gc_sections.patch new file mode 100644 index 0000000000..810c5aecf5 --- /dev/null +++ b/target/linux/generic/hack-5.10/220-gc_sections.patch @@ -0,0 +1,120 @@ +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> +--- +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -113,6 +113,7 @@ config ARM + select HAVE_UID16 + select HAVE_VIRT_CPU_ACCOUNTING_GEN + select IRQ_FORCED_THREADING ++ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION + select MODULES_USE_ELF_REL + select NEED_DMA_MAP_STATE + select OF_EARLY_FLATTREE if OF +--- a/arch/arm/boot/compressed/Makefile ++++ b/arch/arm/boot/compressed/Makefile +@@ -98,6 +98,7 @@ $(foreach o, $(libfdt_objs) atags_to_fdt + ifdef building_out_of_srctree + $(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c)) + endif ++KBUILD_CFLAGS_KERNEL := $(patsubst -f%-sections,,$(KBUILD_CFLAGS_KERNEL)) + + targets := vmlinux vmlinux.lds piggy_data piggy.o \ + lib1funcs.o ashldi3.o bswapsdi2.o \ +--- a/arch/arm/kernel/vmlinux.lds.S ++++ b/arch/arm/kernel/vmlinux.lds.S +@@ -100,24 +100,24 @@ 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 = .; + } + +--- a/arch/arm/include/asm/vmlinux.lds.h ++++ b/arch/arm/include/asm/vmlinux.lds.h +@@ -23,19 +23,19 @@ + #define ARM_MMU_DISCARD(x) + #else + #define ARM_MMU_KEEP(x) +-#define ARM_MMU_DISCARD(x) x ++#define ARM_MMU_DISCARD(x) KEEP(x) + #endif + + #define PROC_INFO \ + . = ALIGN(4); \ + __proc_info_begin = .; \ +- *(.proc.info.init) \ ++ KEEP(*(.proc.info.init)) \ + __proc_info_end = .; + + #define IDMAP_TEXT \ + ALIGN_FUNCTION(); \ + __idmap_text_start = .; \ +- *(.idmap.text) \ ++ KEEP(*(.idmap.text)) \ + __idmap_text_end = .; \ + + #define ARM_DISCARD \ +@@ -96,12 +96,12 @@ + . = 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 = .; \ + } + +@@ -112,14 +112,14 @@ + #define ARM_VECTORS \ + __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 = .; \ |