Commit 9743d12d authored by Feng Tang's avatar Feng Tang Committed by Andrew Morton
Browse files

panic: add 'panic_sys_info=' setup option for kernel cmdline 

'panic_sys_info=' sysctl interface is already added for runtime setting. 
Add counterpart kernel cmdline option for boottime setting.

Link: https://lkml.kernel.org/r/20250703021004.42328-5-feng.tang@linux.alibaba.com


Signed-off-by: default avatarFeng Tang <feng.tang@linux.alibaba.com>
Suggested-by: default avatarPetr Mladek <pmladek@suse.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent d7477559

Documentation/admin-guide/kernel-parameters.txt

+15 −0
Original line number Diff line number Diff line
@@ -4563,6 +4563,21 @@ 
			Use this option carefully, maybe worth to setup a

			bigger log buffer with "log_buf_len" along with this.



	panic_sys_info= A comma separated list of extra information to be dumped

                        on panic.

                        Format: val[,val...]

                        Where @val can be any of the following:



                        tasks:          print all tasks info

                        mem:            print system memory info

			timers:         print timers info

                        locks:          print locks info if CONFIG_LOCKDEP is on

                        ftrace:         print ftrace buffer

                        all_bt:         print all CPUs backtrace (if available in the arch)

                        blocked_tasks:  print only tasks in uninterruptible (blocked) state



                        This is a human readable alternative to the 'panic_print' option.



	parkbd.port=	[HW] Parallel port number the keyboard adapter is

			connected to, default is 0.

			Format: <parport#>

kernel/panic.c

+9 −0
Original line number Diff line number Diff line
@@ -143,6 +143,15 @@ static __init int kernel_panic_sysctls_init(void) 
late_initcall(kernel_panic_sysctls_init);

#endif



/* The format is "panic_sys_info=tasks,mem,locks,ftrace,..." */

static int __init setup_panic_sys_info(char *buf)

{

	/* There is no risk of race in kernel boot phase */

	panic_print = sys_info_parse_param(buf);

	return 1;

}

__setup("panic_sys_info=", setup_panic_sys_info);



static atomic_t warn_count = ATOMIC_INIT(0);



#ifdef CONFIG_SYSFS