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authorHauke Mehrtens <hauke@hauke-m.de>2020-02-23 13:20:11 +0100
committerKoen Vandeputte <koen.vandeputte@ncentric.com>2020-02-28 17:50:45 +0100
commitc16517d26de30c90dabce1e456615fd7fbdce07c (patch)
treee7371ee12a3c413a064885b634ee4c975ad7f96a /target/linux/generic/hack-5.4/220-gc_sections.patch
parent955634b473284847e3c8281a6ac85655329d8b06 (diff)
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kernel: copy kernel 4.19 code to 5.4
No changes were done to the patches while coping them. Currently they do not apply on top of kernel 5.4. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Diffstat (limited to 'target/linux/generic/hack-5.4/220-gc_sections.patch')
-rw-r--r--target/linux/generic/hack-5.4/220-gc_sections.patch192
1 files changed, 192 insertions, 0 deletions
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 0000000000..77422e821b
--- /dev/null
+++ b/target/linux/generic/hack-5.4/220-gc_sections.patch
@@ -0,0 +1,192 @@
+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/Makefile
++++ b/Makefile
+@@ -294,6 +294,11 @@ else
+ scripts/Kbuild.include: ;
+ include scripts/Kbuild.include
+
++ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
++KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
++LDFLAGS_vmlinux += --gc-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)
+@@ -782,11 +787,6 @@ ifdef CONFIG_DEBUG_SECTION_MISMATCH
+ KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
+ endif
+
+-ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+-KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
+-LDFLAGS_vmlinux += --gc-sections
+-endif
+-
+ # arch Makefile may override CC so keep this after arch Makefile is included
+ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -98,6 +98,7 @@ config ARM
+ select HAVE_UID16
+ select HAVE_VIRT_CPU_ACCOUNTING_GEN
+ select IRQ_FORCED_THREADING
++ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
+ select MODULES_USE_ELF_REL
+ select NEED_DMA_MAP_STATE
+ select NO_BOOTMEM
+--- a/arch/arm/boot/compressed/Makefile
++++ b/arch/arm/boot/compressed/Makefile
+@@ -106,6 +106,7 @@ ifeq ($(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
+@@ -22,13 +22,13 @@
+ #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 HYPERVISOR_TEXT \
+@@ -39,11 +39,11 @@
+ #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 \
+@@ -86,12 +86,12 @@
+ . = 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 = .; \
+ }
+
+@@ -102,14 +102,14 @@
+ #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 = .; \
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -43,6 +43,7 @@ config MIPS
+ select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT
+ select HAVE_CBPF_JIT if (!64BIT && !CPU_MICROMIPS)
+ select HAVE_EBPF_JIT if (64BIT && !CPU_MICROMIPS)
++ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
+ select HAVE_CONTEXT_TRACKING
+ select HAVE_COPY_THREAD_TLS
+ select HAVE_C_RECORDMCOUNT
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -72,7 +72,7 @@ SECTIONS
+ /* Exception table for data bus errors */
+ __dbe_table : {
+ __start___dbe_table = .;
+- *(__dbe_table)
++ KEEP(*(__dbe_table))
+ __stop___dbe_table = .;
+ }
+
+@@ -123,7 +123,7 @@ 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 = .;
+ }
+