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authorOlof Johansson <olof@lixom.net>2016-12-12 16:45:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 18:55:09 -0800
commita8cfdc68f6cfc0c7ffc6d664406fe7f06f17eef4 (patch)
tree3a4aa16fa248384237ec776eddf4046ef9e8f59e /lib
parent0a4824bf8f8b88ba62c3c6e01608e8bfc2a99a17 (diff)
downloadlinux-stericsson-a8cfdc68f6cfc0c7ffc6d664406fe7f06f17eef4.tar.gz
printk: add Kconfig option to set default console loglevel
Add a configuration option to set the default console loglevel. This is, as before, still possible to override at runtime through bootargs (loglevel=<x>), sysrq and /proc/printk. There are cases where adding additional arguments on the commandline is impractical, and changing the default for the kernel when being built makes more sense. Provide such a method here, for those who choose to do so. Also, while touching this code, clarify the difference between MESSAGE_LOGLEVEL_DEFAULT and CONSOLE_LOGLEVEL_DEFAULT. Link: http://lkml.kernel.org/r/1479676829-30031-1-git-send-email-olof@lixom.net Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 9bb7d825ba14..65a619e0ad5d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -15,6 +15,21 @@ config PRINTK_TIME
The behavior is also controlled by the kernel command line
parameter printk.time=1. See Documentation/kernel-parameters.txt
+config CONSOLE_LOGLEVEL_DEFAULT
+ int "Default console loglevel (1-15)"
+ range 1 15
+ default "7"
+ help
+ Default loglevel to determine what will be printed on the console.
+
+ Setting a default here is equivalent to passing in loglevel=<x> in
+ the kernel bootargs. loglevel=<x> continues to override whatever
+ value is specified here as well.
+
+ Note: This does not affect the log level of un-prefixed prink()
+ usage in the kernel. That is controlled by the MESSAGE_LOGLEVEL_DEFAULT
+ option.
+
config MESSAGE_LOGLEVEL_DEFAULT
int "Default message log level (1-7)"
range 1 7
@@ -26,6 +41,10 @@ config MESSAGE_LOGLEVEL_DEFAULT
that are auditing their logs closely may want to set it to a lower
priority.
+ Note: This does not affect what message level gets printed on the console
+ by default. To change that, use loglevel=<x> in the kernel bootargs,
+ or pick a different CONSOLE_LOGLEVEL_DEFAULT configuration value.
+
config BOOT_PRINTK_DELAY
bool "Delay each boot printk message by N milliseconds"
depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY