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panic: add note that panic_print sysctl interface is deprecated

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Add a dedicated core parameter 'panic_console_replay' for controlling
console replay, and add note that 'panic_print' sysctl interface will be
obsoleted by 'panic_sys_info' and 'panic_console_replay'.  When it
happens, the SYS_INFO_PANIC_CONSOLE_REPLAY can be removed as well.

Link: https://lkml.kernel.org/r/20250703021004.42328-6-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 10:10:04 +08:00
committed by Andrew Morton
parent 9743d12d0c
commit ee13240cd7
2 changed files with 17 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/admin-guide/kernel-parameters.txt
View File

@@ -4578,6 +4578,10 @@
This is a human readable alternative to the 'panic_print' option.
panic_console_replay
When panic happens, replay all kernel messages on
consoles at the end of panic.
parkbd.port= [HW] Parallel port number the keyboard adapter is
connected to, default is 0.
Format: <parport#>

21
kernel/panic.c
View File

@@ -64,6 +64,7 @@ int panic_on_warn __read_mostly;
unsigned long panic_on_taint;
bool panic_on_taint_nousertaint = false;
static unsigned int warn_limit __read_mostly;
static bool panic_console_replay;
bool panic_triggering_all_cpu_backtrace;
@@ -77,6 +78,13 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
EXPORT_SYMBOL(panic_notifier_list);
#ifdef CONFIG_SYSCTL
static int sysctl_panic_print_handler(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
pr_info_once("Kernel: 'panic_print' sysctl interface will be obsoleted by both 'panic_sys_info' and 'panic_console_replay'\n");
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
static const struct ctl_table kern_panic_table[] = {
#ifdef CONFIG_SMP
{
@@ -108,7 +116,7 @@ static const struct ctl_table kern_panic_table[] = {
.data = &panic_print,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
.proc_handler = sysctl_panic_print_handler,
},
{
.procname = "panic_on_warn",
@@ -247,12 +255,6 @@ void nmi_panic(struct pt_regs *regs, const char *msg)
}
EXPORT_SYMBOL(nmi_panic);
static void panic_console_replay(void)
{
if (panic_print & SYS_INFO_PANIC_CONSOLE_REPLAY)
console_flush_on_panic(CONSOLE_REPLAY_ALL);
}
void check_panic_on_warn(const char *origin)
{
unsigned int limit;
@@ -427,7 +429,9 @@ void panic(const char *fmt, ...)
debug_locks_off();
console_flush_on_panic(CONSOLE_FLUSH_PENDING);
panic_console_replay();
if ((panic_print & SYS_INFO_PANIC_CONSOLE_REPLAY) ||
panic_console_replay)
console_flush_on_panic(CONSOLE_REPLAY_ALL);
if (!panic_blink)
panic_blink = no_blink;
@@ -869,6 +873,7 @@ core_param(panic_print, panic_print, ulong, 0644);
core_param(pause_on_oops, pause_on_oops, int, 0644);
core_param(panic_on_warn, panic_on_warn, int, 0644);
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
core_param(panic_console_replay, panic_console_replay, bool, 0644);
static int __init oops_setup(char *s)
{