reduce module image and resident size

PATCH New Jan Beulich 1 participant 1 message Mar 13, 2008 Module support

Share & tools

Jan Beulich

author

2008-03-13 09:01 UTC #0 lore raw

PATCH 1/1 reduce module image and resident size

Resulting reduction (x86-64, gcc 4.1.2) with my (special purpose, i.e. much reduced) configurations:
- 16k kernel resident size
- 180k module resident size
- 10k module image size

Signed-off-by Jan Beulich <[email protected]>

---
 include/linux/module.h |    2 +-
 kernel/module.c        |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

include/linux/module.h +1 -1

@@ -190,7 +190,7 @@ void *__symbol_get_gpl(const char *symbo
 	extern typeof(sym) sym;					\
 	__CRC_SYMBOL(sym, sec)					\
 	static const char __kstrtab_##sym[]			\
-	__attribute__((section("__ksymtab_strings")))		\
+	__attribute__((section("__ksymtab_strings"), aligned(1))) \
 	= MODULE_SYMBOL_PREFIX #sym;                    	\
 	static const struct kernel_symbol __ksymtab_##sym	\
 	__used							\

kernel/module.c +2 -1

@@ -1815,8 +1815,9 @@ static struct module *load_module(void _
 	unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
 #endif
 
-	/* Don't keep modinfo section */
+	/* Don't keep modinfo and version sections. */
 	sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
+	sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
 #ifdef CONFIG_KALLSYMS
 	/* Keep symbol and string tables for decoding later. */
 	sechdrs[symindex].sh_flags |= SHF_ALLOC;