sorry for noise,there has a fix:

[PATCH] acpi/button.c: fix defined but not used warning
https://lkml.org/lkml/2018/7/11/231

On 2018/7/13 15:19, YueHaibing wrote:
> When CONFIG_PROC_FS isn't set, gcc warning this:
> 
> drivers/acpi/button.c:255:12: warning: ‘acpi_button_state_seq_show’ defined 
> but not used [-Wunused-function]
>  static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
>             ^
> fix this by adding #ifdef around it.
> 
> Signed-off-by: YueHaibing <yuehaib...@huawei.com>
> ---
>  drivers/acpi/button.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
> index 2345a5e..8538e25 100644
> --- a/drivers/acpi/button.c
> +++ b/drivers/acpi/button.c
> @@ -252,6 +252,7 @@ static int acpi_lid_notify_state(struct acpi_device 
> *device, int state)
>       return ret;
>  }
>  
> +#ifdef CONFIG_PROC_FS
>  static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
>  {
>       struct acpi_device *device = seq->private;
> @@ -262,6 +263,7 @@ static int acpi_button_state_seq_show(struct seq_file 
> *seq, void *offset)
>                  state < 0 ? "unsupported" : (state ? "open" : "closed"));
>       return 0;
>  }
> +#endif
>  
>  static int acpi_button_add_fs(struct acpi_device *device)
>  {
> 

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