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Merge branch 'for-5.15-verbose-console' into for-linus

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This commit is contained in:
Petr Mladek 2021-08-30 14:56:28 +02:00
commit baa99c9267
3 changed files with 22 additions and 10 deletions
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9
Documentation/admin-guide/kernel-parameters.txt
View File

@ -4167,6 +4167,15 @@
Format: <bool> (1/Y/y=enable, 0/N/n=disable)
default: disabled
printk.console_no_auto_verbose=
Disable console loglevel raise on oops, panic
or lockdep-detected issues (only if lock debug is on).
With an exception to setups with low baudrate on
serial console, keeping this 0 is a good choice
in order to provide more debug information.
Format: <bool>
default: 0 (auto_verbose is enabled)
printk.devkmsg={on,off,ratelimit}
Control writing to /dev/kmsg.
on - unlimited logging to /dev/kmsg from userspace

11
include/linux/printk.h
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@ -70,16 +70,7 @@ extern int console_printk[];
#define minimum_console_loglevel (console_printk[2])
#define default_console_loglevel (console_printk[3])
static inline void console_silent(void)
{
console_loglevel = CONSOLE_LOGLEVEL_SILENT;
}
static inline void console_verbose(void)
{
if (console_loglevel)
console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
}
extern void console_verbose(void);
/* strlen("ratelimit") + 1 */
#define DEVKMSG_STR_MAX_SIZE 10

12
kernel/printk/printk.c
View File

@ -2380,6 +2380,18 @@ module_param_named(console_suspend, console_suspend_enabled,
MODULE_PARM_DESC(console_suspend, "suspend console during suspend"
" and hibernate operations");
static bool printk_console_no_auto_verbose;
void console_verbose(void)
{
if (console_loglevel && !printk_console_no_auto_verbose)
console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
}
EXPORT_SYMBOL_GPL(console_verbose);
module_param_named(console_no_auto_verbose, printk_console_no_auto_verbose, bool, 0644);
MODULE_PARM_DESC(console_no_auto_verbose, "Disable console loglevel raise to highest on oops/panic/etc");
/**
* suspend_console - suspend the console subsystem
*