Re: [PATCH -next] reboot: Fix build warning without CONFIG_SYSFS

[YueHaibing]

On 2022/4/27 10:26, Luis Chamberlain wrote:
> Your subject says CONFIG_SYSFS but this is for CONFIG_SYSCTL right?
> Can you fix and resubmit  and based it on sysctl-next [0]?

Sorry, will fix and resend.

> 
> If I've missed any other patches please resubmit as well and use
> the [PATCH sysctl-next] as prefix.
> 
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/log/?h=sysctl-next
> 
>   Luis
> 
> On Wed, Apr 27, 2022 at 09:56:35AM +0800, YueHaibing wrote:
>> ping...
>>
>> On 2022/4/7 15:48, YueHaibing wrote:
>>> If CONFIG_SYSFS is n, build warn:
>>>
>>> kernel/reboot.c:443:20: error: ‘kernel_reboot_sysctls_init’ defined but not used [-Werror=unused-function]
>>>  static void __init kernel_reboot_sysctls_init(void)
>>>                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> Move kernel_reboot_sysctls_init() to #ifdef block to fix this.
>>>
>>> Fixes: 6e73c8344931 ("kernel/reboot: move reboot sysctls to its own file")
>>> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
>>> ---
>>>  kernel/reboot.c | 54 ++++++++++++++++++++++++-------------------------
>>>  1 file changed, 27 insertions(+), 27 deletions(-)
>>>
>>> diff --git a/kernel/reboot.c b/kernel/reboot.c
>>> index ed4e6dfb7d44..ecbf09ea03c5 100644
>>> --- a/kernel/reboot.c
>>> +++ b/kernel/reboot.c
>>> @@ -421,33 +421,6 @@ void ctrl_alt_del(void)
>>>  static char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
>>>  static const char reboot_cmd[] = "/sbin/reboot";
>>>  
>>> -#ifdef CONFIG_SYSCTL
>>> -static struct ctl_table kern_reboot_table[] = {
>>> -	{
>>> -		.procname       = "poweroff_cmd",
>>> -		.data           = &poweroff_cmd,
>>> -		.maxlen         = POWEROFF_CMD_PATH_LEN,
>>> -		.mode           = 0644,
>>> -		.proc_handler   = proc_dostring,
>>> -	},
>>> -	{
>>> -		.procname       = "ctrl-alt-del",
>>> -		.data           = &C_A_D,
>>> -		.maxlen         = sizeof(int),
>>> -		.mode           = 0644,
>>> -		.proc_handler   = proc_dointvec,
>>> -	},
>>> -	{ }
>>> -};
>>> -
>>> -static void __init kernel_reboot_sysctls_init(void)
>>> -{
>>> -	register_sysctl_init("kernel", kern_reboot_table);
>>> -}
>>> -#else
>>> -#define kernel_reboot_sysctls_init() do { } while (0)
>>> -#endif /* CONFIG_SYSCTL */
>>> -
>>>  static int run_cmd(const char *cmd)
>>>  {
>>>  	char **argv;
>>> @@ -895,6 +868,33 @@ static struct attribute *reboot_attrs[] = {
>>>  	NULL,
>>>  };
>>>  
>>> +#ifdef CONFIG_SYSCTL
>>> +static struct ctl_table kern_reboot_table[] = {
>>> +	{
>>> +		.procname       = "poweroff_cmd",
>>> +		.data           = &poweroff_cmd,
>>> +		.maxlen         = POWEROFF_CMD_PATH_LEN,
>>> +		.mode           = 0644,
>>> +		.proc_handler   = proc_dostring,
>>> +	},
>>> +	{
>>> +		.procname       = "ctrl-alt-del",
>>> +		.data           = &C_A_D,
>>> +		.maxlen         = sizeof(int),
>>> +		.mode           = 0644,
>>> +		.proc_handler   = proc_dointvec,
>>> +	},
>>> +	{ }
>>> +};
>>> +
>>> +static void __init kernel_reboot_sysctls_init(void)
>>> +{
>>> +	register_sysctl_init("kernel", kern_reboot_table);
>>> +}
>>> +#else
>>> +#define kernel_reboot_sysctls_init() do { } while (0)
>>> +#endif /* CONFIG_SYSCTL */
>>> +
>>>  static const struct attribute_group reboot_attr_group = {
>>>  	.attrs = reboot_attrs,
>>>  };
>>>
> .
>