'panic_sys_info=' sysctl interface is already added for runtime setting.
Add counterpart kernel cmdline option for boottime setting.
Suggested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com>
---
Documentation/admin-guide/kernel-parameters.txt | 15 +++++++++++++++
kernel/panic.c | 9 +++++++++
2 files changed, 24 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index abb2ade021ee..39ddef7c5857 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4541,6 +4541,21 @@
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#>
diff --git a/kernel/panic.c b/kernel/panic.c
index d7aa427dc23c..d9d4fcd5e318 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -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
--
2.43.5