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panic: add note that 'panic_print' parameter is deprecated

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Just like for 'panic_print's systcl interface, add similar note for setup
of kernel cmdline parameter and parameter under /sys/module/kernel/.

Also add __core_param_cb() macro, which enables to add special get/set
operation for a kernel parameter.

Link: https://lkml.kernel.org/r/20250825025701.81921-4-feng.tang@linux.alibaba.com
Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Askar Safin <safinaskar@zohomail.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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Feng Tang
2025-08-25 10:57:00 +08:00
committed by Andrew Morton
parent 8c2b91fbb0
commit 2683df6539
2 changed files with 31 additions and 1 deletions
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13
include/linux/moduleparam.h
View File

@@ -349,6 +349,19 @@ static inline void kernel_param_unlock(struct module *mod)
__module_param_call("", name, &param_ops_##type, &var, perm, \
-1, KERNEL_PARAM_FL_UNSAFE)
/**
* __core_param_cb - similar like core_param, with a set/get ops instead of type.
* @name: the name of the cmdline and sysfs parameter (often the same as var)
* @var: the variable
* @ops: the set & get operations for this parameter.
* @perm: visibility in sysfs
*
* Ideally this should be called 'core_param_cb', but the name has been
* used for module core parameter, so add the '__' prefix
*/
#define __core_param_cb(name, ops, arg, perm) \
__module_param_call("", name, ops, arg, perm, -1, 0)
#endif /* !MODULE */
/**

19
kernel/panic.c
View File

@@ -937,12 +937,29 @@ EXPORT_SYMBOL(__stack_chk_fail);
#endif
core_param(panic, panic_timeout, int, 0644);
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 panic_print_set(const char *val, const struct kernel_param *kp)
{
pr_info_once("Kernel: 'panic_print' parameter will be obsoleted by both 'panic_sys_info' and 'panic_console_replay'\n");
return param_set_ulong(val, kp);
}
static int panic_print_get(char *val, const struct kernel_param *kp)
{
pr_info_once("Kernel: 'panic_print' parameter will be obsoleted by both 'panic_sys_info' and 'panic_console_replay'\n");
return param_get_ulong(val, kp);
}
static const struct kernel_param_ops panic_print_ops = {
.set = panic_print_set,
.get = panic_print_get,
};
__core_param_cb(panic_print, &panic_print_ops, &panic_print, 0644);
static int __init oops_setup(char *s)
{
if (!s)