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

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'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: Feng Tang <feng.tang@linux.alibaba.com>
Suggested-by: Petr 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Feng Tang
2025-07-03 10:10:03 +08:00
committed by Andrew Morton
parent d747755917
commit 9743d12d0c
2 changed files with 24 additions and 0 deletions
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15
Documentation/admin-guide/kernel-parameters.txt
View File

@@ -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#>

9
kernel/panic.c
View File

@@ -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