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- commit 6ea15ff33fe825577346d10d6588a3f4379b6f83
- Author: Arnd Bergmann <arnd@arndb.de>
- Date: Sat Aug 6 22:46:26 2016 +0200
- [EXPERIMENTAL, v3] enable thin archives and --gc-sections on ARM
- I'm still build testing with an experimental change to enable
- thin architeves and --gc-sections on ARM, which should bring
- multiple benefits
- - improve build times
- - allow 'allyesconfig' to succeed without exceeding the
- section size when linking drivers/built-in.o
- - reduce the kernel image size
- Signed-off-by: Arnd Bergmann <arnd@arndb.de>
- diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
- index 5a5399b711c6..b827337a51b5 100644
- --- a/arch/arm/Kconfig
- +++ b/arch/arm/Kconfig
- @@ -91,6 +91,7 @@ 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
- @@ -100,6 +101,7 @@ config ARM
- select PERF_USE_VMALLOC
- select RTC_LIB
- select SYS_SUPPORTS_APM_EMULATION
- + select THIN_ARCHIVES
- # Above selects are sorted alphabetically; please add new ones
- # according to that. Thanks.
- help
- diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
- index d1b06cd79b23..469b78f5f529 100644
- --- a/arch/arm/kernel/Makefile
- +++ b/arch/arm/kernel/Makefile
- @@ -13,6 +13,9 @@ endif
- CFLAGS_REMOVE_return_address.o = -pg
- +ccflags-y += -fno-function-sections -fno-data-sections
- +subdir-ccflags-y += -fno-function-sections -fno-data-sections
- +
- # Object file lists.
- obj-y := elf.o entry-common.o irq.o opcodes.o \
- diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
- index 004b7da48218..6ab1816d995a 100644
- --- a/arch/arm/kernel/vmlinux-xip.lds.S
- +++ b/arch/arm/kernel/vmlinux-xip.lds.S
- @@ -15,17 +15,17 @@
- #define PROC_INFO \
- . = ALIGN(4); \
- VMLINUX_SYMBOL(__proc_info_begin) = .; \
- - *(.proc.info.init) \
- + KEEP(*(.proc.info.init)) \
- VMLINUX_SYMBOL(__proc_info_end) = .;
- #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
- @@ -45,6 +45,16 @@
- #define ARM_EXIT_DISCARD(x) x
- #endif
- +#undef TEXT_TEXT
- +#define TEXT_TEXT \
- + ALIGN_FUNCTION(); \
- + *(.text.hot .text.hot.*) \
- + *(.text.unlikely .text.unlikely.*) \
- + *(.text .text.*) \
- + *(.ref.text) \
- + MEM_KEEP(init.text) \
- + MEM_KEEP(exit.text) \
- +
- OUTPUT_ARCH(arm)
- ENTRY(stext)
- @@ -118,7 +128,7 @@ SECTIONS
- __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
- __start___ex_table = .;
- #ifdef CONFIG_MMU
- - *(__ex_table)
- + KEEP(*(__ex_table))
- #endif
- __stop___ex_table = .;
- }
- @@ -130,12 +140,12 @@ 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
- @@ -150,7 +160,7 @@ SECTIONS
- */
- __vectors_start = .;
- .vectors 0xffff0000 : AT(__vectors_start) {
- - *(.vectors)
- + KEEP(*(.vectors))
- }
- . = __vectors_start + SIZEOF(.vectors);
- __vectors_end = .;
- @@ -173,24 +183,24 @@ 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/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
- index 823d18b39725..161822dc7cac 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 \
- @@ -35,6 +35,16 @@
- *(.hyp.idmap.text) \
- VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
- +#undef TEXT_TEXT
- +#define TEXT_TEXT \
- + ALIGN_FUNCTION(); \
- + *(.text.hot .text.hot.*) \
- + *(.text.unlikely .text.unlikely.*) \
- + *(.text .text.*) \
- + *(.ref.text) \
- + MEM_KEEP(init.text) \
- + MEM_KEEP(exit.text) \
- +
- #ifdef CONFIG_HOTPLUG_CPU
- #define ARM_CPU_DISCARD(x)
- #define ARM_CPU_KEEP(x) x
- @@ -170,7 +180,7 @@ SECTIONS
- */
- __vectors_start = .;
- .vectors 0xffff0000 : AT(__vectors_start) {
- - *(.vectors)
- + KEEP(*(.vectors))
- }
- . = __vectors_start + SIZEOF(.vectors);
- __vectors_end = .;
- @@ -193,24 +203,24 @@ 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 : {
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