diff options
Diffstat (limited to 'target/linux/generic/hack-5.10/221-module_exports.patch')
| -rw-r--r-- | target/linux/generic/hack-5.10/221-module_exports.patch | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/generic/hack-5.10/221-module_exports.patch b/target/linux/generic/hack-5.10/221-module_exports.patch new file mode 100644 index 0000000000..9dd57ba933 --- /dev/null +++ b/target/linux/generic/hack-5.10/221-module_exports.patch @@ -0,0 +1,102 @@ +From b14784e7883390c20ed3ff904892255404a5914b Mon Sep 17 00:00:00 2001 +From: Felix Fietkau <nbd@nbd.name> +Date: Fri, 7 Jul 2017 17:05:53 +0200 +Subject: add an optional config option for stripping all unnecessary symbol exports from the kernel image + +lede-commit: bb5a40c64b7c4f4848509fa0a6625055fc9e66cc +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + include/asm-generic/vmlinux.lds.h | 18 +++++++++++++++--- + include/linux/export.h | 9 ++++++++- + scripts/Makefile.build | 2 +- + 3 files changed, 24 insertions(+), 5 deletions(-) + +--- a/include/asm-generic/vmlinux.lds.h ++++ b/include/asm-generic/vmlinux.lds.h +@@ -81,6 +81,16 @@ + #define RO_EXCEPTION_TABLE + #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 ++ + /* Align . to a 8 byte boundary equals to maximum function alignment. */ + #define ALIGN_FUNCTION() . = ALIGN(8) + +@@ -470,14 +480,14 @@ + /* Kernel symbol table: Normal symbols */ \ + __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ + __start___ksymtab = .; \ +- KEEP(*(SORT(___ksymtab+*))) \ ++ SYMTAB_KEEP \ + __stop___ksymtab = .; \ + } \ + \ + /* Kernel symbol table: GPL-only symbols */ \ + __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ + __start___ksymtab_gpl = .; \ +- KEEP(*(SORT(___ksymtab_gpl+*))) \ ++ SYMTAB_KEEP_GPL \ + __stop___ksymtab_gpl = .; \ + } \ + \ +@@ -539,7 +549,7 @@ + \ + /* Kernel symbol table: strings */ \ + __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ +- *(__ksymtab_strings) \ ++ *(__ksymtab_strings+*) \ + } \ + \ + /* __*init sections */ \ +@@ -1008,6 +1018,8 @@ + + #define COMMON_DISCARDS \ + SANITIZER_DISCARDS \ ++ SYMTAB_DISCARD \ ++ SYMTAB_DISCARD_GPL \ + *(.discard) \ + *(.discard.*) \ + *(.modinfo) \ +--- a/include/linux/export.h ++++ b/include/linux/export.h +@@ -82,6 +82,12 @@ struct kernel_symbol { + + #else + ++#ifdef MODULE ++#define __EXPORT_SUFFIX(sym) ++#else ++#define __EXPORT_SUFFIX(sym) "+" #sym ++#endif ++ + /* + * For every exported symbol, do the following: + * +@@ -99,7 +105,7 @@ struct kernel_symbol { + extern const char __kstrtab_##sym[]; \ + extern const char __kstrtabns_##sym[]; \ + __CRC_SYMBOL(sym, sec); \ +- asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \ ++ asm(" .section \"__ksymtab_strings" __EXPORT_SUFFIX(sym) "\",\"aMS\",%progbits,1 \n" \ + "__kstrtab_" #sym ": \n" \ + " .asciz \"" #sym "\" \n" \ + "__kstrtabns_" #sym ": \n" \ +--- a/scripts/Makefile.build ++++ b/scripts/Makefile.build +@@ -366,7 +366,7 @@ targets += $(lib-y) $(always-y) $(MAKECM + # Linker scripts preprocessor (.lds.S -> .lds) + # --------------------------------------------------------------------------- + quiet_cmd_cpp_lds_S = LDS $@ +- cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ ++ cmd_cpp_lds_S = $(CPP) $(EXTRA_LDSFLAGS) $(cpp_flags) -P -U$(ARCH) \ + -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< + + $(obj)/%.lds: $(src)/%.lds.S FORCE |