From 5b0115fdb4f39c2e250b31ed684d147b6e8d026f Mon Sep 17 00:00:00 2001
From: Steffen Eiden <seiden@linux.ibm.com>
Date: Wed, 3 Nov 2021 13:26:25 +0000
Subject: [PATCH] zdump: refractor PTR_DIFF
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PTR_SUB already implements subtraction of pointers. Let's reuse it.

Suggested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
---
 zdump/zg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zdump/zg.h b/zdump/zg.h
index 93f66f1b..dcab7c44 100644
--- a/zdump/zg.h
+++ b/zdump/zg.h
@@ -142,7 +142,7 @@ static inline u32 zg_csum_partial(const void *buf, int len, u32 sum)
  */
 #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
 #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
-#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
+#define PTR_DIFF(x, y) ((unsigned long)PTR_SUB(x, y))
 
 /*
  * File functions