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From: Sumit Garg <sumit.garg@linaro.org>
To: daniel.thompson@linaro.org
Cc: kgdb-bugreport@lists.sourceforge.net, jason.wessel@windriver.com,
	dianders@chromium.org, pmladek@suse.com,
	sergey.senozhatsky@gmail.com, gregkh@linuxfoundation.org,
	jslaby@suse.com, linux-kernel@vger.kernel.org,
	Sumit Garg <sumit.garg@linaro.org>
Subject: [PATCH v6 1/4] kdb: Re-factor kdb_printf() message write code
Date: Thu,  4 Jun 2020 15:31:16 +0530	[thread overview]
Message-ID: <1591264879-25920-2-git-send-email-sumit.garg@linaro.org> (raw)
In-Reply-To: <1591264879-25920-1-git-send-email-sumit.garg@linaro.org>

Re-factor kdb_printf() message write code in order to avoid duplication
of code and thereby increase readability.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Revieved-by: Petr Mladek <pmladek@suse.com>
---
 kernel/debug/kdb/kdb_io.c | 57 +++++++++++++++++++++++------------------------
 1 file changed, 28 insertions(+), 29 deletions(-)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 924bc92..2d42a02 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -542,6 +542,29 @@ static int kdb_search_string(char *searched, char *searchfor)
 	return 0;
 }
 
+static void kdb_msg_write(const char *msg, int msg_len)
+{
+	struct console *c;
+
+	if (msg_len == 0)
+		return;
+
+	if (dbg_io_ops && !dbg_io_ops->is_console) {
+		const char *cp = msg;
+		int len = msg_len;
+
+		while (len--) {
+			dbg_io_ops->write_char(*cp);
+			cp++;
+		}
+	}
+
+	for_each_console(c) {
+		c->write(c, msg, msg_len);
+		touch_nmi_watchdog();
+	}
+}
+
 int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
 {
 	int diag;
@@ -553,7 +576,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
 	int this_cpu, old_cpu;
 	char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
 	char *moreprompt = "more> ";
-	struct console *c;
 	unsigned long uninitialized_var(flags);
 
 	/* Serialize kdb_printf if multiple cpus try to write at once.
@@ -687,22 +709,11 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
 	 */
 	retlen = strlen(kdb_buffer);
 	cp = (char *) printk_skip_headers(kdb_buffer);
-	if (!dbg_kdb_mode && kgdb_connected) {
+	if (!dbg_kdb_mode && kgdb_connected)
 		gdbstub_msg_write(cp, retlen - (cp - kdb_buffer));
-	} else {
-		if (dbg_io_ops && !dbg_io_ops->is_console) {
-			len = retlen - (cp - kdb_buffer);
-			cp2 = cp;
-			while (len--) {
-				dbg_io_ops->write_char(*cp2);
-				cp2++;
-			}
-		}
-		for_each_console(c) {
-			c->write(c, cp, retlen - (cp - kdb_buffer));
-			touch_nmi_watchdog();
-		}
-	}
+	else
+		kdb_msg_write(cp, retlen - (cp - kdb_buffer));
+
 	if (logging) {
 		saved_loglevel = console_loglevel;
 		console_loglevel = CONSOLE_LOGLEVEL_SILENT;
@@ -751,19 +762,7 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
 			moreprompt = "more> ";
 
 		kdb_input_flush();
-
-		if (dbg_io_ops && !dbg_io_ops->is_console) {
-			len = strlen(moreprompt);
-			cp = moreprompt;
-			while (len--) {
-				dbg_io_ops->write_char(*cp);
-				cp++;
-			}
-		}
-		for_each_console(c) {
-			c->write(c, moreprompt, strlen(moreprompt));
-			touch_nmi_watchdog();
-		}
+		kdb_msg_write(moreprompt, strlen(moreprompt));
 
 		if (logging)
 			printk("%s", moreprompt);
-- 
2.7.4


  reply	other threads:[~2020-06-04 10:01 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-04 10:01 [PATCH v6 0/4] kdb: Improve console handling Sumit Garg
2020-06-04 10:01 ` Sumit Garg [this message]
2020-06-04 10:01 ` [PATCH v6 2/4] kdb: Check status of console prior to invoking handlers Sumit Garg
2020-06-04 10:01 ` [PATCH v6 3/4] kdb: Make kdb_printf() console handling more robust Sumit Garg
2020-06-04 10:01 ` [PATCH v6 4/4] kdb: Switch to use safer dbg_io_ops over console APIs Sumit Garg
2020-06-04 21:12   ` Doug Anderson
2020-06-05  9:53   ` Petr Mladek
2020-06-26 12:13   ` Daniel Thompson
2020-06-26 14:19     ` Greg KH
2020-06-05  3:57 ` [PATCH v6 0/4] kdb: Improve console handling Sergey Senozhatsky

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