module: Export symbols needed for Ksplice

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).

Cc: Anders Kaseorg <andersk@mit.edu>
Cc: Jeff Arnold <jbarnold@mit.edu>
Signed-off-by: Tim Abbott <tabbott@mit.edu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 47 insertions, 24 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index c3d3fc4ffb18..d246da0b0f8c 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -354,6 +354,8 @@ 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.*/
@@ -379,6 +381,31 @@ static inline int within_module_init(unsigned long addr, struct module *mod)
                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. */
 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
@@ -452,6 +479,7 @@ static inline void __module_get(struct module *module)
 #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
index dd4389be9152..5fd00766a4dc 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -68,7 +68,8 @@
 
 /* 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? */
@@ -186,17 +187,6 @@ extern const unsigned long __start___kcrctab_unused_gpl[];
 #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,
@@ -217,10 +207,8 @@ static bool each_symbol_in_section(const struct symsearch *arr,
 }
 
 /* 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[] = {
@@ -273,6 +261,7 @@ static bool each_symbol(bool (*fn)(const struct symsearch *arr,
         }
         return false;
 }
+EXPORT_SYMBOL_GPL(each_symbol);
 
 struct find_symbol_arg {
         /* Input */
@@ -330,11 +319,11 @@ static bool find_symbol_in_section(const struct symsearch *syms,
 
 /* 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;
 
@@ -353,9 +342,10 @@ static const struct kernel_symbol *find_symbol(const char *name,
         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;
 
@@ -365,6 +355,7 @@ static struct module *find_module(const char *name)
         }
         return NULL;
 }
+EXPORT_SYMBOL_GPL(find_module);
 
 #ifdef CONFIG_SMP
 
@@ -641,7 +632,7 @@ static int already_uses(struct module *a, struct module *b)
 }
 
 /* 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;
@@ -674,6 +665,7 @@ static int use_module(struct module *a, struct module *b)
         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)
@@ -951,10 +943,11 @@ static inline void module_unload_free(struct module *mod)
 {
 }
 
-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)
 {
@@ -2803,6 +2796,7 @@ __notrace_funcgraph struct module *__module_address(unsigned long addr)
                         return mod;
         return NULL;
 }
+EXPORT_SYMBOL_GPL(__module_address);
 
 /*
  * is_module_text_address - is this address inside module code?
@@ -2841,6 +2835,7 @@ struct module *__module_text_address(unsigned long addr)
         }
         return mod;
 }
+EXPORT_SYMBOL_GPL(__module_text_address);
 
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)