Ksplice: Add functions for walking kallsyms symbols

Impact: New API

kallsyms_lookup_name only returns the first match that it finds.  Ksplice
needs information about all symbols with a given name in order to correctly
resolve local symbols.

kallsyms_on_each_symbol provides a generic mechanism for iterating over the
kallsyms table.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index 69761ce0dbf0..c3d3fc4ffb18 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -387,6 +387,10 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
 
+int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+                                             struct module *, unsigned long),
+                                   void *data);
+
 extern void __module_put_and_exit(struct module *mod, long code)
         __attribute__((noreturn));
 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
@@ -566,6 +570,14 @@ static inline unsigned long module_kallsyms_lookup_name(const char *name)
         return 0;
 }
 
+static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
+                                                           struct module *,
+                                                           unsigned long),
+                                                 void *data)
+{
+        return 0;
+}
+
 static inline int register_module_notifier(struct notifier_block * nb)
 {
         /* no events will happen anyway, so this can always succeed */