linux-kernel - [PATCH 2/3] kdb: drop newline in unknown command output

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Date:   Fri, 8 Dec 2017 10:19:23 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        kgdb-bugreport@...ts.sourceforge.net
Cc:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [PATCH 2/3] kdb: drop newline in unknown command output

From: Randy Dunlap <rdunlap@...radead.org>

When an unknown command is entered, kdb prints "Unknown kdb command:"
and then the unknown text, including the newline character. This
causes the ending single-quote mark to be printed on the next line
by itself, so just change the ending newline character to a null
character (end of string) so that it won't be "printed."

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Jason Wessel <jason.wessel@...driver.com>
Cc: kgdb-bugreport@...ts.sourceforge.net
---
 kernel/debug/kdb/kdb_main.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- lnx-415-rc1.orig/kernel/debug/kdb/kdb_main.c
+++ lnx-415-rc1/kernel/debug/kdb/kdb_main.c
@@ -1150,6 +1150,16 @@ void kdb_set_current_task(struct task_st
 	kdb_current_regs = NULL;
 }
 
+static void drop_newline(char *buf)
+{
+	size_t len = strlen(buf);
+
+	if (len == 0)
+		return;
+	if (*(buf + len - 1) == '\n')
+		*(buf + len - 1) = '\0';
+}
+
 /*
  * kdb_local - The main code for kdb.  This routine is invoked on a
  *	specific processor, it is not global.  The main kdb() routine
@@ -1327,6 +1337,7 @@ do_full_getstr:
 		cmdptr = cmd_head;
 		diag = kdb_parse(cmdbuf);
 		if (diag == KDB_NOTFOUND) {
+			drop_newline(cmdbuf);
 			kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
 			diag = 0;
 		}