diff options
| author | Sreenath Vijayan <sreenath.vijayan@sony.com> | 2024-03-13 15:50:52 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-11 14:22:52 +0200 |
| commit | 693f75b91a9171e99f84fc193e39f48e21ba4a4f (patch) | |
| tree | 7d8b0475ced8f67d8992b942f08e3a8b86398cf4 /include/linux/printk.h | |
| parent | 25ca2d573ebae939d19f5df5fef2c58ef83ed97a (diff) | |
printk: Add function to replay kernel log on consoles
Add a generic function console_replay_all() for replaying
the kernel log on consoles, in any context. It would allow
viewing the logs on an unresponsive terminal via sysrq.
Reuse the existing code from console_flush_on_panic() for
resetting the sequence numbers, by introducing a new helper
function __console_rewind_all(). It is safe to be called
under console_lock().
Try to acquire lock on the console subsystem without waiting.
If successful, reset the sequence number to oldest available
record on all consoles and call console_unlock() which will
automatically flush the messages to the consoles.
Suggested-by: John Ogness <john.ogness@linutronix.de>
Suggested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Shimoyashiki Taichi <taichi.shimoyashiki@sony.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sreenath Vijayan <sreenath.vijayan@sony.com>
Link: https://lore.kernel.org/r/90ee131c643a5033d117b556c0792de65129d4c3.1710220326.git.sreenath.vijayan@sony.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/printk.h')
| -rw-r--r-- | include/linux/printk.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h index 5e038e782256..1c5936ab991f 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -195,6 +195,7 @@ void show_regs_print_info(const char *log_lvl); extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold; extern asmlinkage void dump_stack(void) __cold; void printk_trigger_flush(void); +void console_replay_all(void); #else static inline __printf(1, 0) int vprintk(const char *s, va_list args) @@ -274,6 +275,9 @@ static inline void dump_stack(void) static inline void printk_trigger_flush(void) { } +static inline void console_replay_all(void) +{ +} #endif bool this_cpu_in_panic(void); |