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authorArjan van de Ven <arjan@linux.intel.com>2006-06-28 04:26:45 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-28 14:59:04 -0700
commitf71d20e961474dde77e6558396efb93d6ac80a4b (patch)
tree669610f79521fd173c28fc47bef39ecd4cdf52ab /include/linux/module.h
parentf5e54d6e53a20cef45af7499e86164f0e0d16bb2 (diff)
downloadop-kernel-dev-f71d20e961474dde77e6558396efb93d6ac80a4b.zip
op-kernel-dev-f71d20e961474dde77e6558396efb93d6ac80a4b.tar.gz
[PATCH] Add EXPORT_UNUSED_SYMBOL and EXPORT_UNUSED_SYMBOL_GPL
Temporarily add EXPORT_UNUSED_SYMBOL and EXPORT_UNUSED_SYMBOL_GPL. These will be used as a transition measure for symbols that aren't used in the kernel and are on the way out. When a module uses such a symbol, a warning is printk'd at modprobe time. The main reason for removing unused exports is size: eacho export takes roughly between 100 and 150 bytes of kernel space in the binary. This patch gives users the option to immediately get this size gain via a config option. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/module.h')
-rw-r--r--include/linux/module.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/module.h b/include/linux/module.h
index 9ebbb74..9e9dc7c 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -203,6 +203,15 @@ void *__symbol_get_gpl(const char *symbol);
#define EXPORT_SYMBOL_GPL_FUTURE(sym) \
__EXPORT_SYMBOL(sym, "_gpl_future")
+
+#ifdef CONFIG_UNUSED_SYMBOLS
+#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
+#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
+#else
+#define EXPORT_UNUSED_SYMBOL(sym)
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)
+#endif
+
#endif
struct module_ref
@@ -261,6 +270,15 @@ struct module
unsigned int num_gpl_syms;
const unsigned long *gpl_crcs;
+ /* unused exported symbols. */
+ const struct kernel_symbol *unused_syms;
+ unsigned int num_unused_syms;
+ const unsigned long *unused_crcs;
+ /* GPL-only, unused exported symbols. */
+ const struct kernel_symbol *unused_gpl_syms;
+ unsigned int num_unused_gpl_syms;
+ const unsigned long *unused_gpl_crcs;
+
/* symbols that will be GPL-only in the near future. */
const struct kernel_symbol *gpl_future_syms;
unsigned int num_gpl_future_syms;
@@ -456,6 +474,8 @@ void module_remove_driver(struct device_driver *);
#define EXPORT_SYMBOL(sym)
#define EXPORT_SYMBOL_GPL(sym)
#define EXPORT_SYMBOL_GPL_FUTURE(sym)
+#define EXPORT_UNUSED_SYMBOL(sym)
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)
/* Given an address, look for it in the exception tables. */
static inline const struct exception_table_entry *
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