ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/generic/hack-5.4/220-gc_sections.patch b/target/linux/generic/hack-5.4/220-gc_sections.patch
new file mode 100644
index 0000000..da85f16
--- /dev/null
+++ b/target/linux/generic/hack-5.4/220-gc_sections.patch
@@ -0,0 +1,139 @@
+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(-)
+
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -112,6 +112,7 @@ 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
+@@ -108,6 +108,7 @@ 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.
+--- 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/kernel/vmlinux.lds.h
++++ b/arch/arm/kernel/vmlinux.lds.h
+@@ -22,7 +22,7 @@
+ #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
+
+ /*
+@@ -41,7 +41,7 @@
+ #define PROC_INFO \
+ . = ALIGN(4); \
+ __proc_info_begin = .; \
+- *(.proc.info.init) \
++ KEEP(*(.proc.info.init)) \
+ __proc_info_end = .;
+
+ #define HYPERVISOR_TEXT \
+@@ -52,11 +52,11 @@
+ #define IDMAP_TEXT \
+ ALIGN_FUNCTION(); \
+ __idmap_text_start = .; \
+- *(.idmap.text) \
++ KEEP(*(.idmap.text)) \
+ __idmap_text_end = .; \
+ . = ALIGN(PAGE_SIZE); \
+ __hyp_idmap_text_start = .; \
+- *(.hyp.idmap.text) \
++ KEEP(*(.hyp.idmap.text)) \
+ __hyp_idmap_text_end = .;
+
+ #define ARM_DISCARD \
+@@ -99,12 +99,12 @@
+ . = 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 = .; \
+ }
+
+@@ -116,7 +116,7 @@
+ __vectors_lma = .; \
+ OVERLAY 0xffff0000 : NOCROSSREFS AT(__vectors_lma) { \
+ .vectors { \
+- *(.vectors) \
++ KEEP(*(.vectors)) \
+ } \
+ .vectors.bhb.loop8 { \
+ *(.vectors.bhb.loop8) \
+@@ -134,7 +134,7 @@
+ \
+ __stubs_lma = .; \
+ .stubs ADDR(.vectors) + 0x1000 : AT(__stubs_lma) { \
+- *(.stubs) \
++ KEEP(*(.stubs)) \
+ } \
+ ARM_LMA(__stubs, .stubs); \
+ . = __stubs_lma + SIZEOF(.stubs); \