From: Joern Engel <joern@logfs.org>
Date: Wed, 20 Feb 2013 19:38:59 +0000 (-0800)
Subject: printk: add CON_ALLDATA console flag
X-Git-Tag: next-20130320~19^2~9
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5fea309688754f3d26d79a44003045fb9eaabb25;p=karo-tx-linux.git

printk: add CON_ALLDATA console flag

For consoles like netconsole and blockconsole the loglevel filtering
really doesn't make any sense.  If a line gets printed at all, please
send it down to that console, no questions asked.

For vga_con, it is a completely different matter, as the user sitting in
front of his console could get spammed by messages while trying to login
or similar.  So ignore_loglevel doesn't work as a one-size-fits-all
approach.  Add a per-console flag instead so that netconsole and
blockconsole can opt-in.

Signed-off-by: Joern Engel <joern@logfs.org>
---

diff --git a/include/linux/console.h b/include/linux/console.h
index dedb082fe50f..eed92ad1cb88 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -116,6 +116,7 @@ static inline int con_debug_leave(void)
 #define CON_BOOT	(8)
 #define CON_ANYTIME	(16) /* Safe to call when cpu is offline */
 #define CON_BRL		(32) /* Used for a braille device */
+#define CON_ALLDATA	(64) /* per-console ignore_loglevel */
 
 struct console {
 	char	name[16];
diff --git a/kernel/printk.c b/kernel/printk.c
index 267ce780abe8..5221c591ccbe 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1261,8 +1261,6 @@ static void call_console_drivers(int level, const char *text, size_t len)
 
 	trace_console(text, 0, len, len);
 
-	if (level >= console_loglevel && !ignore_loglevel)
-		return;
 	if (!console_drivers)
 		return;
 
@@ -1276,6 +1274,9 @@ static void call_console_drivers(int level, const char *text, size_t len)
 		if (!cpu_online(smp_processor_id()) &&
 		    !(con->flags & CON_ANYTIME))
 			continue;
+		if (level >= console_loglevel && !ignore_loglevel &&
+		    !(con->flags & CON_ALLDATA))
+			continue;
 		con->write(con, text, len);
 	}
 }