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, 3 insertions, 3 deletions

diff --git a/arch/sh64/kernel/unwind.c b/arch/sh64/kernel/unwind.c
index f934f97f9f9c..1214c78e3584 100644
--- a/arch/sh64/kernel/unwind.c
+++ b/arch/sh64/kernel/unwind.c
@@ -46,15 +46,15 @@ static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,
                       struct pt_regs *regs)
 {
         const char *sym;
-        char *modname, namebuf[128];
-        unsigned long offset, size;
+        char namebuf[128];
+        unsigned long offset;
         unsigned long prologue = 0;
         unsigned long fp_displacement = 0;
         unsigned long fp_prev = 0;
         unsigned long offset_r14 = 0, offset_r18 = 0;
         int i, found_prologue_end = 0;
 
-        sym = kallsyms_lookup(pc, &size, &offset, &modname, namebuf);
+        sym = kallsyms_lookup(pc, NULL, &offset, NULL, namebuf);
         if (!sym)
                 return -EINVAL;