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Message-Id: <20090207124640.2E724DDDDF@ozlabs.org>
Date: Sat, 07 Feb 2009 23:15:22 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: linux-kernel@...r.kernel.org
Cc: Tim Abbott <tabbott@....edu>
Subject: [PATCH 7/9] module: Export symbols needed for Ksplice
From: Tim Abbott <tabbott@....edu>
Impact: Expose some module.c symbols
Ksplice uses several functions from module.c in order to resolve
symbols and implement dependency handling. Calling these functions
requires holding module_mutex, so it is exported.
(This is just the module part of a bigger add-exports patch from Tim).b
Cc: Anders Kaseorg <andersk@....edu>
Cc: Jeff Arnold <jbarnold@....edu>
Signed-off-by: Tim Abbott <tabbott@....edu>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
include/linux/module.h | 28 ++++++++++++++++++++++++++++
kernel/module.c | 41 +++++++++++++++++------------------------
2 files changed, 45 insertions(+), 24 deletions(-)
diff --git a/include/linux/module.h b/include/linux/module.h
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -350,6 +350,8 @@ struct module
#define MODULE_ARCH_INIT {}
#endif
+extern struct mutex module_mutex;
+
/* FIXME: It'd be nice to isolate modules during init, too, so they
aren't used before they (may) fail. But presently too much code
(IDE & SCSI) require entry into the module during init.*/
@@ -374,6 +376,31 @@ static inline int within_module_init(uns
return (unsigned long)mod->module_init <= addr &&
addr < (unsigned long)mod->module_init + mod->init_size;
}
+
+/* Search for module by name: must hold module_mutex. */
+struct module *find_module(const char *name);
+
+struct symsearch {
+ const struct kernel_symbol *start, *stop;
+ const unsigned long *crcs;
+ enum {
+ NOT_GPL_ONLY,
+ GPL_ONLY,
+ WILL_BE_GPL_ONLY,
+ } licence;
+ bool unused;
+};
+
+/* Search for an exported symbol by name. */
+const struct kernel_symbol *find_symbol(const char *name,
+ struct module **owner,
+ const unsigned long **crc,
+ bool gplok,
+ bool warn);
+
+/* Walk the exported symbol table */
+bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
+ unsigned int symnum, void *data), void *data);
/* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
symnum out of range. */
@@ -448,6 +475,7 @@ static inline void __module_get(struct m
#define symbol_put_addr(p) do { } while(0)
#endif /* CONFIG_MODULE_UNLOAD */
+int use_module(struct module *a, struct module *b);
/* This is a #define so the string doesn't get put in every .o file */
#define module_name(mod) \
diff --git a/kernel/module.c b/kernel/module.c
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -67,7 +67,8 @@
/* List of modules, protected by module_mutex or preempt_disable
* (delete uses stop_machine/add uses RCU list operations). */
-static DEFINE_MUTEX(module_mutex);
+DEFINE_MUTEX(module_mutex);
+EXPORT_SYMBOL_GPL(module_mutex);
static LIST_HEAD(modules);
/* Waiting for a module to finish initializing? */
@@ -185,17 +186,6 @@ extern const unsigned long __start___kcr
#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
#endif
-struct symsearch {
- const struct kernel_symbol *start, *stop;
- const unsigned long *crcs;
- enum {
- NOT_GPL_ONLY,
- GPL_ONLY,
- WILL_BE_GPL_ONLY,
- } licence;
- bool unused;
-};
-
static bool each_symbol_in_section(const struct symsearch *arr,
unsigned int arrsize,
struct module *owner,
@@ -216,10 +206,8 @@ static bool each_symbol_in_section(const
}
/* Returns true as soon as fn returns true, otherwise false. */
-static bool each_symbol(bool (*fn)(const struct symsearch *arr,
- struct module *owner,
- unsigned int symnum, void *data),
- void *data)
+bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
+ unsigned int symnum, void *data), void *data)
{
struct module *mod;
const struct symsearch arr[] = {
@@ -272,6 +260,7 @@ static bool each_symbol(bool (*fn)(const
}
return false;
}
+EXPORT_SYMBOL_GPL(each_symbol);
struct find_symbol_arg {
/* Input */
@@ -329,11 +318,11 @@ static bool find_symbol_in_section(const
/* Find a symbol and return it, along with, (optional) crc and
* (optional) module which owns it */
-static const struct kernel_symbol *find_symbol(const char *name,
- struct module **owner,
- const unsigned long **crc,
- bool gplok,
- bool warn)
+const struct kernel_symbol *find_symbol(const char *name,
+ struct module **owner,
+ const unsigned long **crc,
+ bool gplok,
+ bool warn)
{
struct find_symbol_arg fsa;
@@ -352,9 +341,10 @@ static const struct kernel_symbol *find_
DEBUGP("Failed to find symbol %s\n", name);
return NULL;
}
+EXPORT_SYMBOL_GPL(find_symbol);
/* Search for module by name: must hold module_mutex. */
-static struct module *find_module(const char *name)
+struct module *find_module(const char *name)
{
struct module *mod;
@@ -364,6 +354,7 @@ static struct module *find_module(const
}
return NULL;
}
+EXPORT_SYMBOL_GPL(find_module);
#ifdef CONFIG_SMP
/* Number of blocks used and allocated. */
@@ -607,7 +598,7 @@ static int already_uses(struct module *a
}
/* Module a uses b */
-static int use_module(struct module *a, struct module *b)
+int use_module(struct module *a, struct module *b)
{
struct module_use *use;
int no_warn, err;
@@ -640,6 +631,7 @@ static int use_module(struct module *a,
no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
return 1;
}
+EXPORT_SYMBOL_GPL(use_module);
/* Clear the unload stuff of the module. */
static void module_unload_free(struct module *mod)
@@ -917,10 +909,11 @@ static inline void module_unload_free(st
{
}
-static inline int use_module(struct module *a, struct module *b)
+int use_module(struct module *a, struct module *b)
{
return strong_try_module_get(b) == 0;
}
+EXPORT_SYMBOL_GPL(use_module);
static inline void module_unload_init(struct module *mod)
{
--
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