linux-kernel - Re: [PATCH -next] reboot: Fix build warning without CONFIG

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Date:   Tue, 26 Apr 2022 19:26:00 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     tangmeng@...ontech.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] reboot: Fix build warning without CONFIG_SYSFS

Your subject says CONFIG_SYSFS but this is for CONFIG_SYSCTL right?
Can you fix and resubmit  and based it on sysctl-next [0]?

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@...wei.com>
> > ---
> >  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,
> >  };
> >