perf sort: Drop ip_[lr] arguments from _sort__sym_cmp()

Current _sort__sym_cmp() function is used for comparing symbols between
two hist entries on symbol, symbol_from and symbol_to sort keys.  Those
functions pass addresses of symbols but it's meaningless since it gets
over-written inside of the _sort__sym_cmp function to a start address of
the symbol.  So just get rid of them.

This might cause a difference than prior output for branch stacks since
it seems not using start address of the symbol but branch address.
However AFAICS it'd be same as it gets overwritten anyway.

Also remove redundant part of code in sort__sym_cmp().

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1360130237-9963-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/sort.c

@@ -160,9 +160,10 @@ struct sort_entry sort_dso = {
 
 /* --sort symbol */
 
-static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r,
-			      u64 ip_l, u64 ip_r)
+static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r)
 {
+	u64 ip_l, ip_r;
+
 	if (!sym_l || !sym_r)
 		return cmp_null(sym_l, sym_r);
 
@@ -178,21 +179,10 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r,
 static int64_t
 sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	u64 ip_l, ip_r;
-
 	if (!left->ms.sym && !right->ms.sym)
 		return right->level - left->level;
 
-	if (!left->ms.sym || !right->ms.sym)
-		return cmp_null(left->ms.sym, right->ms.sym);
-
-	if (left->ms.sym == right->ms.sym)
-		return 0;
-
-	ip_l = left->ms.sym->start;
-	ip_r = right->ms.sym->start;
-
-	return _sort__sym_cmp(left->ms.sym, right->ms.sym, ip_l, ip_r);
+	return _sort__sym_cmp(left->ms.sym, right->ms.sym);
 }
 
 static int _hist_entry__sym_snprintf(struct map *map, struct symbol *sym,
@@ -383,8 +373,7 @@ sort__sym_from_cmp(struct hist_entry *left, struct hist_entry *right)
 	if (!from_l->sym && !from_r->sym)
 		return right->level - left->level;
 
-	return _sort__sym_cmp(from_l->sym, from_r->sym, from_l->addr,
-			     from_r->addr);
+	return _sort__sym_cmp(from_l->sym, from_r->sym);
 }
 
 static int64_t
@@ -396,7 +385,7 @@ sort__sym_to_cmp(struct hist_entry *left, struct hist_entry *right)
 	if (!to_l->sym && !to_r->sym)
 		return right->level - left->level;
 
-	return _sort__sym_cmp(to_l->sym, to_r->sym, to_l->addr, to_r->addr);
+	return _sort__sym_cmp(to_l->sym, to_r->sym);
 }
 
 static int hist_entry__sym_from_snprintf(struct hist_entry *self, char *bf,