diff options
| author | Feng Tang <feng.tang@linux.alibaba.com> | 2025-07-03 10:10:01 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-07-19 19:08:24 -0700 |
| commit | b76e89e50fc3693b7b8a443ed906320d8ccb93fd (patch) | |
| tree | d43d537583cad2a5e31e3cdaf7fb3964ac609eaa /kernel/panic.c | |
| parent | 261743b0135d1d578cab407ba0cf226df30b43d8 (diff) | |
panic: generalize panic_print's function to show sys info
'panic_print' was introduced to help debugging kernel panic by dumping
different kinds of system information like tasks' call stack, memory,
ftrace buffer, etc. Actually this function could also be used to help
debugging other cases like task-hung, soft/hard lockup, etc. where user
may need the snapshot of system info at that time.
Extract system info dump function related code from panic.c to separate
file sys_info.[ch], for wider usage by other kernel parts for debugging.
Also modify the macro names about singulars/plurals.
Link: https://lkml.kernel.org/r/20250703021004.42328-3-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>
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 36 |
1 files changed, 4 insertions, 32 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index 9b6c5dc28a65..cbb0681177b3 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -36,6 +36,7 @@ #include <linux/sysfs.h> #include <linux/context_tracking.h> #include <linux/seq_buf.h> +#include <linux/sys_info.h> #include <trace/events/error_report.h> #include <asm/sections.h> @@ -69,14 +70,6 @@ bool panic_triggering_all_cpu_backtrace; int panic_timeout = CONFIG_PANIC_TIMEOUT; EXPORT_SYMBOL_GPL(panic_timeout); -#define PANIC_PRINT_TASK_INFO 0x00000001 -#define PANIC_PRINT_MEM_INFO 0x00000002 -#define PANIC_PRINT_TIMER_INFO 0x00000004 -#define PANIC_PRINT_LOCK_INFO 0x00000008 -#define PANIC_PRINT_FTRACE_INFO 0x00000010 -#define PANIC_CONSOLE_REPLAY 0x00000020 -#define PANIC_PRINT_ALL_CPU_BT 0x00000040 -#define PANIC_PRINT_BLOCKED_TASKS 0x00000080 unsigned long panic_print; ATOMIC_NOTIFIER_HEAD(panic_notifier_list); @@ -240,31 +233,10 @@ EXPORT_SYMBOL(nmi_panic); static void panic_console_replay(void) { - if (panic_print & PANIC_CONSOLE_REPLAY) + if (panic_print & SYS_INFO_PANIC_CONSOLE_REPLAY) console_flush_on_panic(CONSOLE_REPLAY_ALL); } -static void panic_print_sys_info(void) -{ - if (panic_print & PANIC_PRINT_TASK_INFO) - show_state(); - - if (panic_print & PANIC_PRINT_MEM_INFO) - show_mem(); - - if (panic_print & PANIC_PRINT_TIMER_INFO) - sysrq_timer_list_show(); - - if (panic_print & PANIC_PRINT_LOCK_INFO) - debug_show_all_locks(); - - if (panic_print & PANIC_PRINT_FTRACE_INFO) - ftrace_dump(DUMP_ALL); - - if (panic_print & PANIC_PRINT_BLOCKED_TASKS) - show_state_filter(TASK_UNINTERRUPTIBLE); -} - void check_panic_on_warn(const char *origin) { unsigned int limit; @@ -285,7 +257,7 @@ void check_panic_on_warn(const char *origin) */ static void panic_other_cpus_shutdown(bool crash_kexec) { - if (panic_print & PANIC_PRINT_ALL_CPU_BT) { + if (panic_print & SYS_INFO_ALL_CPU_BT) { /* Temporary allow non-panic CPUs to write their backtraces. */ panic_triggering_all_cpu_backtrace = true; trigger_all_cpu_backtrace(); @@ -410,7 +382,7 @@ void panic(const char *fmt, ...) */ atomic_notifier_call_chain(&panic_notifier_list, 0, buf); - panic_print_sys_info(); + sys_info(panic_print); kmsg_dump_desc(KMSG_DUMP_PANIC, buf); |