linux-kernel - [PATCH v2] kdb: kdb_main: refactor code in kdb_md

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Message-ID: <20180816140141.GA28913@embeddedor.com>
Date:   Thu, 16 Aug 2018 09:01:41 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Cc:     kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH v2] kdb: kdb_main: refactor code in kdb_md_line

Replace the whole switch statement with a for loop.
This makes the code much clear and easy to read.

This also addresses the following Coverity warnings:

Addresses-Coverity-ID: 115090 ("Missing break in switch")
Addresses-Coverity-ID: 115091 ("Missing break in switch")
Addresses-Coverity-ID: 114700 ("Missing break in switch")

Suggested-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
Changes in v2:
 - Add new variable j and use it for the for loop.

 kernel/debug/kdb/kdb_main.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 2ddfce8..a9ad288 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1493,6 +1493,7 @@ static void kdb_md_line(const char *fmtstr, unsigned long addr,
 	char cbuf[32];
 	char *c = cbuf;
 	int i;
+	int j;
 	unsigned long word;
 
 	memset(cbuf, '\0', sizeof(cbuf));
@@ -1538,25 +1539,9 @@ static void kdb_md_line(const char *fmtstr, unsigned long addr,
 			wc.word = word;
 #define printable_char(c) \
 	({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
-			switch (bytesperword) {
-			case 8:
+			for (j = 0; j < bytesperword; j++)
 				*c++ = printable_char(*cp++);
-				*c++ = printable_char(*cp++);
-				*c++ = printable_char(*cp++);
-				*c++ = printable_char(*cp++);
-				addr += 4;
-			case 4:
-				*c++ = printable_char(*cp++);
-				*c++ = printable_char(*cp++);
-				addr += 2;
-			case 2:
-				*c++ = printable_char(*cp++);
-				addr++;
-			case 1:
-				*c++ = printable_char(*cp++);
-				addr++;
-				break;
-			}
+			addr += bytesperword;
 #undef printable_char
 		}
 	}
-- 
2.7.4