Re: [PATCH-next 3/3] serial/sysrq: Add MAGIC_SYSRQ_SERIAL_SEQUENCE

[kbuild test robot <lkp@xxxxxxxxx>]

Hi Dmitry,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tty/tty-testing]
[also build test ERROR on next-20200109]
[cannot apply to linux/master usb/usb-testing linus/master v5.5-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Dmitry-Safonov/serial-sysrq-Add-MAGIC_SYSRQ_SERIAL_SEQUENCE/20200110-191606
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
config: microblaze-nommu_defconfig (attached as .config)
compiler: microblaze-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> drivers/tty/serial/serial_core.c:3084:33: error: 'CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE' undeclared here (not in a function)
    const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/tty/serial/serial_core.c: In function 'uart_sysrq_on':
>> drivers/tty/serial/serial_core.c:3088:2: error: implicit declaration of function 'sysrq_toggle_support' [-Werror=implicit-function-declaration]
     sysrq_toggle_support(1);
     ^~~~~~~~~~~~~~~~~~~~
   drivers/tty/serial/serial_core.c: In function 'uart_handle_sysrq_char':
>> drivers/tty/serial/serial_core.c:3125:7: error: implicit declaration of function 'sysrq_get_mask'; did you mean 'xas_get_mark'? [-Werror=implicit-function-declaration]
      if (sysrq_get_mask()) {
          ^~~~~~~~~~~~~~
          xas_get_mark
   cc1: some warnings being treated as errors

vim +/CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE +3084 drivers/tty/serial/serial_core.c

  3083	
> 3084	const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
  3085	
  3086	static void uart_sysrq_on(struct work_struct *w)
  3087	{
> 3088		sysrq_toggle_support(1);
  3089		pr_info("SysRq is enabled by magic sequience on serial\n");
  3090	}
  3091	static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);
  3092	
  3093	static int uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
  3094	{
  3095		if (sysrq_toggle_seq[0] == '\0')
  3096			return 0;
  3097	
  3098		BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= sizeof(port->sysrq_seq)*U8_MAX);
  3099		if (sysrq_toggle_seq[port->sysrq_seq] != ch) {
  3100			port->sysrq_seq = 0;
  3101			return 0;
  3102		}
  3103	
  3104		/* Without the last \0 */
  3105		if (++port->sysrq_seq < (ARRAY_SIZE(sysrq_toggle_seq) - 1)) {
  3106			port->sysrq = jiffies + HZ*5;
  3107			return 1;
  3108		}
  3109	
  3110		schedule_work(&sysrq_enable_work);
  3111	
  3112		port->sysrq = 0;
  3113		return 1;
  3114	}
  3115	
  3116	int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
  3117	{
  3118		if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
  3119			return 0;
  3120	
  3121		if (!port->has_sysrq || !port->sysrq)
  3122			return 0;
  3123	
  3124		if (ch && time_before(jiffies, port->sysrq)) {
> 3125			if (sysrq_get_mask()) {
  3126				handle_sysrq(ch);
  3127				port->sysrq = 0;
  3128				return 1;
  3129			}
  3130			if (uart_try_toggle_sysrq(port, ch))
  3131				return 1;
  3132		}
  3133		port->sysrq = 0;
  3134	
  3135		return 0;
  3136	}
  3137	EXPORT_SYMBOL_GPL(uart_handle_sysrq_char);
  3138	

---
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