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From 79bfd044ed82290603093be1a3759672176f3e6f Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Tue, 19 Jun 2018 13:30:04 +0200
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Subject: [PATCH] printk: Make CONSOLE_LOGLEVEL_QUIET configurable
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The goal of passing the "quiet" option to the kernel is for the kernel
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to be quiet unless something really is wrong.
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Sofar passing quiet has been (mostly) equivalent to passing
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loglevel=4 on the kernel commandline. Which means to show any messages
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with a level of KERN_ERR or higher severity on the console.
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In practice this often does not result in a quiet boot though, since
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there are many false-positive or otherwise harmless error messages printed,
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defeating the purpose of the quiet option. Esp. the ACPICA code is really
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bad wrt this, but there are plenty of others too.
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This commit makes CONSOLE_LOGLEVEL_QUIET configurable.
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This for example will allow distros which want quiet to really mean quiet
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to set CONSOLE_LOGLEVEL_QUIET so that only messages with a higher severity
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then KERN_ERR (CRIT, ALERT, EMERG) get printed, avoiding an endless game
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of whack-a-mole silencing harmless error messages.
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Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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include/linux/printk.h | 6 +++---
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lib/Kconfig.debug | 11 +++++++++++
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2 files changed, 14 insertions(+), 3 deletions(-)
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diff --git a/include/linux/printk.h b/include/linux/printk.h
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index 6d7e800affd8..18602bb3eca8 100644
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--- a/include/linux/printk.h
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+++ b/include/linux/printk.h
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@@ -50,15 +50,15 @@ static inline const char *printk_skip_headers(const char *buffer)
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/* We show everything that is MORE important than this.. */
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#define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
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#define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
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-#define CONSOLE_LOGLEVEL_QUIET 4 /* Shhh ..., when booted with "quiet" */
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#define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
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#define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
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/*
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- * Default used to be hard-coded at 7, we're now allowing it to be set from
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- * kernel config.
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+ * Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
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+ * we're now allowing both to be set from kernel config.
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*/
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#define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
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+#define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
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extern int console_printk[];
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diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
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index 8838d1158d19..0d1c48dd22a9 100644
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--- a/lib/Kconfig.debug
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+++ b/lib/Kconfig.debug
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@@ -30,6 +30,17 @@ config CONSOLE_LOGLEVEL_DEFAULT
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usage in the kernel. That is controlled by the MESSAGE_LOGLEVEL_DEFAULT
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option.
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+config CONSOLE_LOGLEVEL_QUIET
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+ int "quiet console loglevel (1-15)"
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+ range 1 15
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+ default "4"
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+ help
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+ loglevel to use when "quiet" is passed on the kernel commandline.
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+
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+ When "quiet" is passed on the kernel commandline this loglevel
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+ will be used as the loglevel. IOW passing "quiet" will be the
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+ equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"
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+
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config MESSAGE_LOGLEVEL_DEFAULT
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int "Default message log level (1-7)"
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range 1 7
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--
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2.18.0
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