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>

3 files changed, 5 insertions, 9 deletions

diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index 5f75b3e65986..89c03707eccc 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -216,11 +216,8 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
                 /* Handle some frequent special cases.... */
                 {
                         char symname[KSYM_NAME_LEN+1];
-                        char *modname;
-                        unsigned long symsize, offset;
 
-                        kallsyms_lookup(info->ip, &symsize, &offset,
-                                        &modname, symname);
+                        kallsyms_lookup(info->ip, NULL, NULL, NULL, symname);
 
                         dbg("info->ip = 0x%lx, name = %s\n", info->ip, symname);
 
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index b481db1dacb4..28fdf4f50c27 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -1217,7 +1217,6 @@ static void get_function_bounds(unsigned long pc, unsigned long *startp,
 {
         unsigned long size, offset;
         const char *name;
-        char *modname;
 
         *startp = *endp = 0;
         if (pc == 0)
@@ -1225,7 +1224,7 @@ static void get_function_bounds(unsigned long pc, unsigned long *startp,
         if (setjmp(bus_error_jmp) == 0) {
                 catch_memory_errors = 1;
                 sync();
-                name = kallsyms_lookup(pc, &size, &offset, &modname, tmpstr);
+                name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr);
                 if (name != NULL) {
                         *startp = pc - offset;
                         *endp = pc - offset + size;
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;