linux-kernel - [PATCH v4 1/7] printk: report dropped messages on separate line

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Message-Id: <1405718885-11227-2-git-send-email-elder@linaro.org>
Date:	Fri, 18 Jul 2014 16:27:59 -0500
From:	Alex Elder <elder@...aro.org>
To:	akpm@...ux-foundation.org
Cc:	kay@...y.org, pmladek@...e.cz, bp@...e.de, john.stultz@...aro.org,
	jack@...e.cz, linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/7] printk: report dropped messages on separate line

It is possible for the log to be filled too quickly for the consoles
to be able to keep up.  This is detected in console_unlock(), and when
it occurs, a message is inserted to note the event.  When reviewing
some nearby code, Petr Mládek suggested it might be nicer if this
message were placed on a separate line.  This patch implements that
suggestion.

Suggested-by: Petr Mládek <pmladek@...e.cz>
Signed-off-by: Alex Elder <elder@...aro.org>
---
 kernel/printk/printk.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 13e839d..ffc9928 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2142,9 +2142,10 @@ again:
 		}
 
 		if (console_seq < log_first_seq) {
-			len = sprintf(text, "** %u printk messages dropped ** ",
+			len = sprintf(text,
+				      "%s** %u printk messages dropped **\n",
+				      (console_prev & LOG_CONT) ? "\n" : "",
 				      (unsigned)(log_first_seq - console_seq));
-
 			/* messages are gone, move to first one */
 			console_seq = log_first_seq;
 			console_idx = log_first_idx;
-- 
1.9.1

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