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path: root/target/linux/generic/patches-3.18/204-module_strip.patch
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From: Felix Fietkau <nbd@openwrt.org>
Subject: [PATCH] build: add a hack for removing non-essential module info

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -84,9 +84,10 @@ void trim_init_extable(struct module *m)
 
 /* Generic info of form tag = "info" */
 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
+#define MODULE_INFO_STRIP(tag, info) __MODULE_INFO_STRIP(tag, tag, info)
 
 /* For userspace: you can also call me... */
-#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
+#define MODULE_ALIAS(_alias) MODULE_INFO_STRIP(alias, _alias)
 
 /* Soft module dependencies. See man modprobe.d for details.
  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-07 06:59:31 +0000
or) MODULE_INFO(author, _author) +#define MODULE_AUTHOR(_author) MODULE_INFO_STRIP(author, _author) /* What your module does. */ -#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description) +#define MODULE_DESCRIPTION(_description) MODULE_INFO_STRIP(description, _description) -#ifdef MODULE +#if defined(MODULE) && !defined(CONFIG_MODULE_STRIPPED) /* Creates an alias so file2alias.c can find device table. */ #define MODULE_DEVICE_TABLE(type, name) \ extern const struct type##_device_id __mod_##type##__##name##_device_table \ @@ -159,7 +160,9 @@ void trim_init_extable(struct module *m) */ #if defined(MODULE) || !defined(CONFIG_SYSFS) -#define MODULE_VERSION(_version) MODULE_INFO(version, _version) +#define MODULE_VERSION(_version) MODULE_INFO_STRIP(version, _version) +#elif defined(CONFIG_MODULE_STRIPPED) +#define MODULE_VERSION(_version) __MODULE_INFO_DISABLED(version) #else #define MODULE_VERSION(_version) \ static struct module_version_attribute ___modver_attr = { \ @@ -181,7 +184,7 @@ void trim_init_extable(struct module *m) /* Optional firmware file (or files) needed by the module * format is simply firmware file name. Multiple firmware * files require multiple MODULE_FIRMWARE() specifiers */ -#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware) +#define MODULE_FIRMWARE(_firmware) MODULE_INFO_STRIP(firmware, _firmware) /* Given an address, look for it in the exception tables */ const struct exception_table_entry *search_exception_tables(unsigned long add); --- a/include/linux/moduleparam.h +++ b/include/linux/moduleparam.h @@ -16,6 +16,16 @@ /* Chosen so that structs with an unsigned long line up. */ #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long)) +/* This struct is here for syntactic coherency, it is not used */ +#define __MODULE_INFO_DISABLED(name) \ + struct __UNIQUE_ID(name) {} + +#ifdef CONFIG_MODULE_STRIPPED +#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO_DISABLED(name) +#else +#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO(tag, name, info) +#endif + #ifdef MODULE #define __MODULE_INFO(tag, name, info) \ static const char __UNIQUE_ID(name)[] \ @@ -23,8 +33,7 @@ static const char __UNIQUE_ID(name)[] = __stringify(tag) "=" info #else /* !MODULE */ /* This struct is here for syntactic coherency, it is not used */ -#define __MODULE_INFO(tag, name, info) \ - struct __UNIQUE_ID(name) {} +#define __MODULE_INFO(tag, name, info) __MODULE_INFO_DISABLED(name) #endif #define __MODULE_PARM_TYPE(name, _type) \ __MODULE_INFO(parmtype, name##type, #name ":" _type) @@ -32,7 +41,7 @@ static const char __UNIQUE_ID(name)[] /* One for each parameter, describing how to use it. Some files do multiple of these per line, so can't just use MODULE_INFO. */ #define MODULE_PARM_DESC(_parm, desc) \ - __MODULE_INFO(parm, _parm, #_parm ":" desc) + __MODULE_INFO_STRIP(parm, _parm, #_parm ":" desc) struct kernel_param; --- a/init/Kconfig +++ b/init/Kconfig @@ -1987,6 +1987,13 @@ config MODULE_COMPRESS_XZ endchoice +config MODULE_STRIPPED + bool "Reduce module size" + depends on MODULES + help + Remove module parameter descriptions, author info, version, aliases, + device tables, etc. + endif # MODULES config INIT_ALL_POSSIBLE --- a/kernel/module.c +++ b/kernel/module.c @@ -2670,6 +2670,7 @@ static struct module *setup_load_info(st static int check_modinfo(struct module *mod, struct load_info *info, int flags) { +#ifndef CONFIG_MODULE_STRIPPED const char *modmagic = get_modinfo(info, "vermagic"); int err; @@ -2695,6 +2696,7 @@ static int check_modinfo(struct module * pr_warn("%s: module is from the staging directory, the quality " "is unknown, you have been warned.\n", mod->name); } +#endif /* Set up license info based on the info section */ set_license(mod, get_modinfo(info, "license")); --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1726,7 +1726,9 @@ static void read_symbols(char *modname) symname = remove_dot(info.strtab + sym->st_name); handle_modversions(mod, &info, sym, symname); +#ifndef CONFIG_MODULE_STRIPPED handle_moddevtable(mod, &info, sym, symname); +#endif } if (!is_vmlinux(modname) || (is_vmlinux(modname) && vmlinux_section_warnings)) @@ -1870,7 +1872,9 @@ static void add_header(struct buffer *b, buf_printf(b, "#include <linux/vermagic.h>\n"); buf_printf(b, "#include <linux/compiler.h>\n"); buf_printf(b, "\n"); +#ifndef CONFIG_MODULE_STRIPPED buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); +#endif buf_printf(b, "\n"); buf_printf(b, "__visible struct module __this_module\n"); buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); @@ -1887,16 +1891,20 @@ static void add_header(struct buffer *b, static void add_intree_flag(struct buffer *b, int is_intree) { +#ifndef CONFIG_MODULE_STRIPPED if (is_intree) buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); +#endif } static void add_staging_flag(struct buffer *b, const char *name) { +#ifndef CONFIG_MODULE_STRIPPED static const char *staging_dir = "drivers/staging"; if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); +#endif } /** @@ -1989,11 +1997,13 @@ static void add_depends(struct buffer *b static void add_srcversion(struct buffer *b, struct module *mod) { +#ifndef CONFIG_MODULE_STRIPPED if (mod->srcversion[0]) { buf_printf(b, "\n"); buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", mod->srcversion); } +#endif } static void write_if_changed(struct buffer *b, const char *fname) @@ -2224,7 +2234,9 @@ int main(int argc, char **argv) add_staging_flag(&buf, mod->name); err |= add_versions(&buf, mod); add_depends(&buf, mod, modules); +#ifndef CONFIG_MODULE_STRIPPED add_moddevtable(&buf, mod); +#endif add_srcversion(&buf, mod); sprintf(fname, "%s.mod.c", mod->name);
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-07 06:59:31 +0000