kernel: use -ffunction-sections, -fdata-sections and --gc-sections on ARM to reduce...

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35936 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic/patches-3.8/220-gc_sections.patch b/target/linux/generic/patches-3.8/220-gc_sections.patch
index 0edba22..5fb54a2 100644 (file)
--- a/target/linux/generic/patches-3.8/220-gc_sections.patch
+++ b/target/linux/generic/patches-3.8/220-gc_sections.patch
@@ -1,6 +1,6 @@
 --- a/arch/mips/Makefile
 +++ b/arch/mips/Makefile
-@@ -89,10 +89,12 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
+@@ -89,10 +89,14 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
  #
  cflags-y                      += -G 0 -mno-abicalls -fno-pic -pipe
  cflags-y                      += -msoft-float
@@ -9,7 +9,9 @@
  KBUILD_AFLAGS_MODULE          += -mlong-calls
  KBUILD_CFLAGS_MODULE          += -mlong-calls
  
++ifndef CONFIG_FUNCTION_TRACER
 +KBUILD_CFLAGS_KERNEL          += -ffunction-sections -fdata-sections
++endif
 +
  cflags-y += -ffreestanding
  
@@ -370,3 +372,93 @@
  #else
  #define INIT_RAM_FS
  #endif
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -17,11 +17,16 @@ LDFLAGS_vmlinux    :=-p --no-undefined -X
+ ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
+ LDFLAGS_vmlinux       += --be8
+ endif
++LDFLAGS_vmlinux += --gc-sections
+ 
+ OBJCOPYFLAGS  :=-O binary -R .comment -S
+ GZFLAGS               :=-9
+ #KBUILD_CFLAGS        +=-pipe
+ 
++ifndef CONFIG_FUNCTION_TRACER
++KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
++endif
++
+ # Never generate .eh_frame
+ KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
+ 
+--- a/arch/arm/kernel/vmlinux.lds.S
++++ b/arch/arm/kernel/vmlinux.lds.S
+@@ -12,13 +12,13 @@
+ #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) = .;
+ 
+ #ifdef CONFIG_HOTPLUG_CPU
+@@ -118,7 +118,7 @@ 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 +130,12 @@ 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
+@@ -158,24 +158,24 @@ 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/target/linux/generic/patches-3.8/305-mips_module_reloc.patch b/target/linux/generic/patches-3.8/305-mips_module_reloc.patch
index f0f5137..98d4c1d 100644 (file)
--- a/target/linux/generic/patches-3.8/305-mips_module_reloc.patch
+++ b/target/linux/generic/patches-3.8/305-mips_module_reloc.patch
@@ -12,8 +12,8 @@
 +KBUILD_CFLAGS_MODULE          += -mno-long-calls
 +endif
  
+ ifndef CONFIG_FUNCTION_TRACER
  KBUILD_CFLAGS_KERNEL          += -ffunction-sections -fdata-sections
- 
 --- a/arch/mips/include/asm/module.h
 +++ b/arch/mips/include/asm/module.h
 @@ -11,6 +11,11 @@ struct mod_arch_specific {