From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 13 Mar 2008 09:02:17 +0000 (+0000)
Subject: module: reduce module image and resident size
X-Git-Tag: v2.6.26-rc1~23^2~4
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ea01e798e2d27fd04142e0473ca36570fa9d9218;p=linux-2.6-omap-h63xx.git

module: 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 <jbeulich@novell.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

diff --git a/include/linux/module.h b/include/linux/module.h
index a29c2ebb7c3..3e03b1acbc9 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -190,7 +190,7 @@ void *__symbol_get_gpl(const char *symbol);
 	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							\
diff --git a/kernel/module.c b/kernel/module.c
index b0d7c2a41bd..031bf26af8e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1828,8 +1828,9 @@ static struct module *load_module(void __user *umod,
 	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;