perf block-info: Fix wrong block address comparison in block_info__cmp()

Commit 6041441 ("perf block: Cleanup and refactor block info
functions") introduces block_info__cmp(), which compares two blocks.

But the issues are:

1. It should return the strcmp cmp value only if it's not 0.

2. When symbol names are matched, we need to compare the addresses
   of blocks further. But it wrongly uses the symbol addresses for
   comparison.

3. If the syms are both NULL, we can't consider these two blocks are
   matched.

This patch fixes above 3 issues.

Fixes: 6041441 ("perf block: Cleanup and refactor block info functions")
Signed-off-by: Jin Yao <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: Jin Yao

tools/perf/util/block-info.c

@@ -74,30 +74,21 @@ int64_t block_info__cmp(struct perf_hpp_fmt *fmt __maybe_unused,
 
 	if (!bi_l->sym || !bi_r->sym) {
 		if (!bi_l->sym && !bi_r->sym)
-			return 0;
+			return -1;
 		else if (!bi_l->sym)
 			return -1;
 		else
 			return 1;
 	}
 
-	if (bi_l->sym == bi_r->sym) {
-		if (bi_l->start == bi_r->start) {
-			if (bi_l->end == bi_r->end)
-				return 0;
-			else
-				return (int64_t)(bi_r->end - bi_l->end);
-		} else
-			return (int64_t)(bi_r->start - bi_l->start);
-	} else {
-		cmp = strcmp(bi_l->sym->name, bi_r->sym->name);
+	cmp = strcmp(bi_l->sym->name, bi_r->sym->name);
+	if (cmp)
 		return cmp;
-	}
 
-	if (bi_l->sym->start != bi_r->sym->start)
-		return (int64_t)(bi_r->sym->start - bi_l->sym->start);
+	if (bi_l->start != bi_r->start)
+		return (int64_t)(bi_r->start - bi_l->start);
 
-	return (int64_t)(bi_r->sym->end - bi_l->sym->end);
+	return (int64_t)(bi_r->end - bi_l->end);
 }
 
 static void init_block_info(struct block_info *bi, struct symbol *sym,