Simplify kallsyms_lookup()

Several kallsyms_lookup() pass dummy arguments but only need, say, module's
name.  Make kallsyms_lookup() accept NULLs where possible.

Also, makes picture clearer about what interfaces are needed for all symbol
resolving business.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 4 deletions

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c1e308a080b8..7f573136a905 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -340,10 +340,7 @@ static const char *usage_str[] =
 
 const char * __get_key_name(struct lockdep_subclass_key *key, char *str)
 {
-        unsigned long offs, size;
-        char *modname;
-
-        return kallsyms_lookup((unsigned long)key, &size, &offs, &modname, str);
+        return kallsyms_lookup((unsigned long)key, NULL, NULL, NULL, str);
 }
 
 void