Remove duplication of the message about deprecated 'panic_print'
parameter.

Also make the wording more direct. Make it clear that the new
parameters already exist and should be used instead.

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
Changes since v1:

  - fixed compilation with CONFIG_SYSCTL disabled (kernel test
    robot <lkp@intel.com>)

Thanks Lance Yang <lance.yang@linux.dev> for debugging the compilation
error reported by the test robot.

 kernel/panic.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index 12a10e17ab4a..24bca263f896 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -77,6 +77,11 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
+static void panic_print_deprecated(void)
+{
+	pr_info_once("Kernel: The 'panic_print' parameter is now deprecated. Please use 'panic_sys_info' and 'panic_console_replay' instead.\n");
+}
+
 #ifdef CONFIG_SYSCTL
 
 /*
@@ -125,7 +130,7 @@ static int proc_taint(const struct ctl_table *table, int write,
 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");
+	panic_print_deprecated();
 	return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 }
 
@@ -944,13 +949,13 @@ 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");
+	panic_print_deprecated();
 	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");
+	panic_print_deprecated();
 	return  param_get_ulong(val, kp);
 }
 
-- 
2.50.1

On Wed, Aug 20, 2025 at 11:40:32AM +0200, Petr Mladek wrote:
> Remove duplication of the message about deprecated 'panic_print'
> parameter.
> 
> Also make the wording more direct. Make it clear that the new
> parameters already exist and should be used instead.
> 
> Signed-off-by: Petr Mladek <pmladek@suse.com>

Thanks for the cleanup!

Reviewed-by: Feng Tang <feng.tang@linux.alibaba.com>

> ---
> Changes since v1:
> 
>   - fixed compilation with CONFIG_SYSCTL disabled (kernel test
>     robot <lkp@intel.com>)
> 
> Thanks Lance Yang <lance.yang@linux.dev> for debugging the compilation
> error reported by the test robot.
> 
>  kernel/panic.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 12a10e17ab4a..24bca263f896 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -77,6 +77,11 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
>  
>  EXPORT_SYMBOL(panic_notifier_list);
>  
> +static void panic_print_deprecated(void)
> +{
> +	pr_info_once("Kernel: The 'panic_print' parameter is now deprecated. Please use 'panic_sys_info' and 'panic_console_replay' instead.\n");
> +}
> +
>  #ifdef CONFIG_SYSCTL
>  
>  /*
> @@ -125,7 +130,7 @@ static int proc_taint(const struct ctl_table *table, int write,
>  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");
> +	panic_print_deprecated();
>  	return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
>  }
>  
> @@ -944,13 +949,13 @@ 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");
> +	panic_print_deprecated();
>  	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");
> +	panic_print_deprecated();
>  	return  param_get_ulong(val, kp);
>  }
>  
> -- 
> 2.50.1

On 2025/8/20 17:40, Petr Mladek wrote:
> Remove duplication of the message about deprecated 'panic_print'
> parameter.
> 
> Also make the wording more direct. Make it clear that the new
> parameters already exist and should be used instead.
> 
> Signed-off-by: Petr Mladek <pmladek@suse.com>

Confirmed that it fixes the build error when CONFIG_SYSCTL is
disabled.

Tested-by: Lance Yang <lance.yang@linux.dev>