209 lines
7.1 KiB
Diff
209 lines
7.1 KiB
Diff
From a779a482fb9b9f8fcdf8b2519c789b4b9bb5dd05 Mon Sep 17 00:00:00 2001
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 7 Jul 2017 16:56:48 +0200
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Subject: build: add a hack for removing non-essential module info
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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include/linux/module.h | 13 ++++++++-----
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include/linux/moduleparam.h | 15 ++++++++++++---
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init/Kconfig | 7 +++++++
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kernel/module.c | 5 ++++-
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scripts/mod/modpost.c | 12 ++++++++++++
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5 files changed, 43 insertions(+), 9 deletions(-)
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--- a/include/linux/module.h
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+++ b/include/linux/module.h
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@@ -158,6 +158,7 @@ extern void cleanup_module(void);
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/* Generic info of form tag = "info" */
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#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
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+#define MODULE_INFO_STRIP(tag, info) __MODULE_INFO_STRIP(tag, tag, info)
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/* For userspace: you can also call me... */
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#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
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@@ -201,12 +202,12 @@ extern void cleanup_module(void);
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* Author(s), use "Name <email>" or just "Name", for multiple
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* authors use multiple MODULE_AUTHOR() statements/lines.
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*/
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-#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
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+#define MODULE_AUTHOR(_author) MODULE_INFO_STRIP(author, _author)
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/* What your module does. */
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-#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
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+#define MODULE_DESCRIPTION(_description) MODULE_INFO_STRIP(description, _description)
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-#ifdef MODULE
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+#if defined(MODULE) && !defined(CONFIG_MODULE_STRIPPED)
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/* Creates an alias so file2alias.c can find device table. */
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#define MODULE_DEVICE_TABLE(type, name) \
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extern typeof(name) __mod_##type##__##name##_device_table \
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@@ -233,7 +234,9 @@ extern typeof(name) __mod_##type##__##na
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*/
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#if defined(MODULE) || !defined(CONFIG_SYSFS)
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-#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
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+#define MODULE_VERSION(_version) MODULE_INFO_STRIP(version, _version)
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+#elif defined(CONFIG_MODULE_STRIPPED)
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+#define MODULE_VERSION(_version) __MODULE_INFO_DISABLED(version)
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#else
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#define MODULE_VERSION(_version) \
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static struct module_version_attribute ___modver_attr = { \
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@@ -255,7 +258,7 @@ extern typeof(name) __mod_##type##__##na
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/* Optional firmware file (or files) needed by the module
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* format is simply firmware file name. Multiple firmware
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* files require multiple MODULE_FIRMWARE() specifiers */
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-#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
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+#define MODULE_FIRMWARE(_firmware) MODULE_INFO_STRIP(firmware, _firmware)
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struct notifier_block;
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--- a/include/linux/moduleparam.h
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+++ b/include/linux/moduleparam.h
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@@ -17,6 +17,16 @@
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/* Chosen so that structs with an unsigned long line up. */
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#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
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+/* This struct is here for syntactic coherency, it is not used */
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+#define __MODULE_INFO_DISABLED(name) \
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+ struct __UNIQUE_ID(name) {}
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+
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+#ifdef CONFIG_MODULE_STRIPPED
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+#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO_DISABLED(name)
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+#else
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+#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO(tag, name, info)
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+#endif
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+
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#ifdef MODULE
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#define __MODULE_INFO(tag, name, info) \
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static const char __UNIQUE_ID(name)[] \
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@@ -24,8 +34,7 @@ static const char __UNIQUE_ID(name)[]
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= __stringify(tag) "=" info
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#else /* !MODULE */
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/* This struct is here for syntactic coherency, it is not used */
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-#define __MODULE_INFO(tag, name, info) \
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- struct __UNIQUE_ID(name) {}
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+#define __MODULE_INFO(tag, name, info) __MODULE_INFO_DISABLED(name)
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#endif
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#define __MODULE_PARM_TYPE(name, _type) \
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__MODULE_INFO(parmtype, name##type, #name ":" _type)
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@@ -33,7 +42,7 @@ static const char __UNIQUE_ID(name)[]
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/* One for each parameter, describing how to use it. Some files do
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multiple of these per line, so can't just use MODULE_INFO. */
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#define MODULE_PARM_DESC(_parm, desc) \
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- __MODULE_INFO(parm, _parm, #_parm ":" desc)
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+ __MODULE_INFO_STRIP(parm, _parm, #_parm ":" desc)
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struct kernel_param;
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1903,6 +1903,13 @@ config TRIM_UNUSED_KSYMS
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If unsure, or if you need to build out-of-tree modules, say N.
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+config MODULE_STRIPPED
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+ bool "Reduce module size"
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+ depends on MODULES
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+ help
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+ Remove module parameter descriptions, author info, version, aliases,
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+ device tables, etc.
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+
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endif # MODULES
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config MODULES_TREE_LOOKUP
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--- a/kernel/module.c
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+++ b/kernel/module.c
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@@ -3006,9 +3006,11 @@ static struct module *setup_load_info(st
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static int check_modinfo(struct module *mod, struct load_info *info, int flags)
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{
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- const char *modmagic = get_modinfo(info, "vermagic");
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int err;
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+#ifndef CONFIG_MODULE_STRIPPED
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+ const char *modmagic = get_modinfo(info, "vermagic");
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+
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if (flags & MODULE_INIT_IGNORE_VERMAGIC)
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modmagic = NULL;
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@@ -3029,6 +3031,7 @@ static int check_modinfo(struct module *
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mod->name);
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add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
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}
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+#endif
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check_modinfo_retpoline(mod, info);
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--- a/scripts/mod/modpost.c
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+++ b/scripts/mod/modpost.c
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@@ -1982,7 +1982,9 @@ static void read_symbols(char *modname)
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symname = remove_dot(info.strtab + sym->st_name);
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handle_modversions(mod, &info, sym, symname);
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+#ifndef CONFIG_MODULE_STRIPPED
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handle_moddevtable(mod, &info, sym, symname);
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+#endif
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}
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if (!is_vmlinux(modname) ||
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(is_vmlinux(modname) && vmlinux_section_warnings))
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@@ -2143,8 +2145,10 @@ static void add_header(struct buffer *b,
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buf_printf(b, "#include <linux/vermagic.h>\n");
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buf_printf(b, "#include <linux/compiler.h>\n");
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buf_printf(b, "\n");
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+#ifndef CONFIG_MODULE_STRIPPED
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buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
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buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
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+#endif
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buf_printf(b, "\n");
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buf_printf(b, "__visible struct module __this_module\n");
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buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
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@@ -2161,8 +2165,10 @@ static void add_header(struct buffer *b,
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static void add_intree_flag(struct buffer *b, int is_intree)
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{
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+#ifndef CONFIG_MODULE_STRIPPED
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if (is_intree)
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buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
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+#endif
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}
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/* Cannot check for assembler */
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@@ -2175,10 +2181,12 @@ static void add_retpoline(struct buffer
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static void add_staging_flag(struct buffer *b, const char *name)
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{
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+#ifndef CONFIG_MODULE_STRIPPED
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static const char *staging_dir = "drivers/staging";
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if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
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buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
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+#endif
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}
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/**
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@@ -2277,11 +2285,13 @@ static void add_depends(struct buffer *b
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static void add_srcversion(struct buffer *b, struct module *mod)
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{
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+#ifndef CONFIG_MODULE_STRIPPED
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if (mod->srcversion[0]) {
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buf_printf(b, "\n");
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buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
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mod->srcversion);
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}
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+#endif
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}
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static void write_if_changed(struct buffer *b, const char *fname)
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@@ -2518,7 +2528,9 @@ int main(int argc, char **argv)
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add_staging_flag(&buf, mod->name);
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err |= add_versions(&buf, mod);
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add_depends(&buf, mod, modules);
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+#ifndef CONFIG_MODULE_STRIPPED
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add_moddevtable(&buf, mod);
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+#endif
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add_srcversion(&buf, mod);
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sprintf(fname, "%s.mod.c", mod->name);
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