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authornbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2013-01-26 16:26:13 +0000
committernbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2013-01-26 16:26:13 +0000
commitedf06589cc0ad9474b6c17aa84af90a932eaca13 (patch)
tree24d7f96936770d3e3ee904982008bfcf174acc7e /target/linux/generic/patches-3.7/221-module_exports.patch
parent0a3970a70de5376f9a7ddef0c0b68acf9eb8caab (diff)
kernel: use -ffunction-sections, -fdata-sections and --gc-sections on mips
in combination with kernel symbol export stripping this significantly reduces the kernel image size git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35320 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-3.7/221-module_exports.patch')
-rw-r--r--target/linux/generic/patches-3.7/221-module_exports.patch88
1 files changed, 88 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.7/221-module_exports.patch b/target/linux/generic/patches-3.7/221-module_exports.patch
new file mode 100644
index 0000000000..da08de626a
--- /dev/null
+++ b/target/linux/generic/patches-3.7/221-module_exports.patch
@@ -0,0 +1,88 @@
+--- a/include/asm-generic/vmlinux.lds.h
++++ b/include/asm-generic/vmlinux.lds.h
+@@ -52,6 +52,16 @@
+ #define LOAD_OFFSET 0
+ #endif
+
++#ifndef SYMTAB_KEEP
++#define SYMTAB_KEEP KEEP(*(SORT(___ksymtab+*)))
++#define SYMTAB_KEEP_GPL KEEP(*(SORT(___ksymtab_gpl+*)))
++#endif
++
++#ifndef SYMTAB_DISCARD
++#define SYMTAB_DISCARD
++#define SYMTAB_DISCARD_GPL
++#endif
++
+ #ifndef SYMBOL_PREFIX
+ #define VMLINUX_SYMBOL(sym) sym
+ #else
+@@ -277,14 +287,14 @@
+ /* Kernel symbol table: Normal symbols */ \
+ __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start___ksymtab) = .; \
+- KEEP(*(SORT(___ksymtab+*))) \
++ SYMTAB_KEEP \
+ VMLINUX_SYMBOL(__stop___ksymtab) = .; \
+ } \
+ \
+ /* Kernel symbol table: GPL-only symbols */ \
+ __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
+- KEEP(*(SORT(___ksymtab_gpl+*))) \
++ SYMTAB_KEEP_GPL \
+ VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
+ } \
+ \
+@@ -346,7 +356,7 @@
+ \
+ /* Kernel symbol table: strings */ \
+ __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
+- *(__ksymtab_strings) \
++ *(__ksymtab_strings+*) \
+ } \
+ \
+ /* __*init sections */ \
+@@ -680,6 +690,8 @@
+ EXIT_TEXT \
+ EXIT_DATA \
+ EXIT_CALL \
++ SYMTAB_DISCARD \
++ SYMTAB_DISCARD_GPL \
+ *(.discard) \
+ *(.discard.*) \
+ }
+--- a/scripts/Makefile.build
++++ b/scripts/Makefile.build
+@@ -348,7 +348,7 @@ targets += $(extra-y) $(MAKECMDGOALS) $(
+ # Linker scripts preprocessor (.lds.S -> .lds)
+ # ---------------------------------------------------------------------------
+ quiet_cmd_cpp_lds_S = LDS $@
+- cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
++ cmd_cpp_lds_S = $(CPP) $(EXTRA_LDSFLAGS) $(cpp_flags) -P -C -U$(ARCH) \
+ -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
+
+ $(obj)/%.lds: $(src)/%.lds.S FORCE
+--- a/include/linux/export.h
++++ b/include/linux/export.h
+@@ -45,12 +45,19 @@ extern struct module __this_module;
+ #define __CRC_SYMBOL(sym, sec)
+ #endif
+
++#ifdef MODULE
++#define __EXPORT_SUFFIX(sym)
++#else
++#define __EXPORT_SUFFIX(sym) "+" #sym
++#endif
++
+ /* For every exported symbol, place a struct in the __ksymtab section */
+ #define __EXPORT_SYMBOL(sym, sec) \
+ extern typeof(sym) sym; \
+ __CRC_SYMBOL(sym, sec) \
+ static const char __kstrtab_##sym[] \
+- __attribute__((section("__ksymtab_strings"), aligned(1))) \
++ __attribute__((section("__ksymtab_strings" \
++ __EXPORT_SUFFIX(sym)), aligned(1))) \
+ = MODULE_SYMBOL_PREFIX #sym; \
+ static const struct kernel_symbol __ksymtab_##sym \
+ __used \