linux-kernel - [PATCH] printk: add Kconfig for default console loglevel

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Date:	Tue, 26 Jul 2011 11:33:51 -0400
From:	Dave Reisner <d@...conindy.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Dave Reisner <dreisner@...hlinux.org>
Subject: [PATCH] printk: add Kconfig for default console loglevel

Keep the historical default of 7, but allow distributions and users to
tune this value instead of requiring a kernel cmdline parameter.

Signed-off-by: Dave Reisner <dreisner@...hlinux.org>
---
 kernel/printk.c   |    4 +++-
 lib/Kconfig.debug |   10 ++++++++++
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 37dff34..fabc216 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -58,7 +58,9 @@ void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
 
 /* We show everything that is MORE important than this.. */
 #define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */
-#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */
+
+/* default to 7 -- anything MORE serious than KERN_DEBUG */
+#define DEFAULT_CONSOLE_LOGLEVEL CONFIG_DEFAULT_CONSOLE_LOGLEVEL
 
 DECLARE_WAIT_QUEUE_HEAD(log_wait);
 
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c0cb9c4..6caa66e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -21,6 +21,16 @@ config DEFAULT_MESSAGE_LOGLEVEL
 	  that are auditing their logs closely may want to set it to a lower
 	  priority.
 
+config DEFAULT_CONSOLE_LOGLEVEL
+	int "Default console log level (1-7)"
+	range 1 7
+	default "7"
+	help
+	  Default console log level setting for printk statements.
+
+	  This was hard-coded to KERN_INFO (7) since at least 2.6.12. You may
+	  wish to turn this down to 4 for a quieter console.
+
 config ENABLE_WARN_DEPRECATED
 	bool "Enable __deprecated logic"
 	default y
-- 
1.7.6

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