linux-kernel - Re: [PATCH 2/2] printk: Add boottime and real timestamps

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Date:   Thu, 27 Jul 2017 11:02:52 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Prarit Bhargava <prarit@...hat.com>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Jonathan Corbet <corbet@....net>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Christoffer Dall <cdall@...aro.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Olof Johansson <olof@...om.net>, Theodore Ts'o <tytso@....edu>,
        Josh Poimboeuf <jpoimboe@...hat.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/2] printk: Add boottime and real timestamps

Hi Prarit,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc2]
[cannot apply to next-20170726]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Prarit-Bhargava/printk-allow-different-timestamps-for-printk-time/20170727-104148
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/printk/printk.c: In function 'printk_late_init':
>> kernel/printk/printk.c:2746:6: error: 'printk_time_setting' undeclared (first use in this function)
     if (printk_time_setting == 0)
         ^~~~~~~~~~~~~~~~~~~
   kernel/printk/printk.c:2746:6: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/printk/printk.c:2747:25: error: 'printk_time' undeclared (first use in this function)
      printk_time_setting = printk_time;
                            ^~~~~~~~~~~

vim +/printk_time_setting +2746 kernel/printk/printk.c

  2724	
  2725	/*
  2726	 * Some boot consoles access data that is in the init section and which will
  2727	 * be discarded after the initcalls have been run. To make sure that no code
  2728	 * will access this data, unregister the boot consoles in a late initcall.
  2729	 *
  2730	 * If for some reason, such as deferred probe or the driver being a loadable
  2731	 * module, the real console hasn't registered yet at this point, there will
  2732	 * be a brief interval in which no messages are logged to the console, which
  2733	 * makes it difficult to diagnose problems that occur during this time.
  2734	 *
  2735	 * To mitigate this problem somewhat, only unregister consoles whose memory
  2736	 * intersects with the init section. Note that code exists elsewhere to get
  2737	 * rid of the boot console as soon as the proper console shows up, so there
  2738	 * won't be side-effects from postponing the removal.
  2739	 */
  2740	static int __init printk_late_init(void)
  2741	{
  2742		struct console *con;
  2743		int ret;
  2744	
  2745		/* initialize printk_time settings */
> 2746		if (printk_time_setting == 0)
> 2747			printk_time_setting = printk_time;
  2748	
  2749		for_each_console(con) {
  2750			if (!keep_bootcon && con->flags & CON_BOOT) {
  2751				/*
  2752				 * Make sure to unregister boot consoles whose data
  2753				 * resides in the init section before the init section
  2754				 * is discarded. Boot consoles whose data will stick
  2755				 * around will automatically be unregistered when the
  2756				 * proper console replaces them.
  2757				 */
  2758				if (init_section_intersects(con, sizeof(*con)))
  2759					unregister_console(con);
  2760			}
  2761		}
  2762		ret = cpuhp_setup_state_nocalls(CPUHP_PRINTK_DEAD, "printk:dead", NULL,
  2763						console_cpu_notify);
  2764		WARN_ON(ret < 0);
  2765		ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "printk:online",
  2766						console_cpu_notify, NULL);
  2767		WARN_ON(ret < 0);
  2768		return 0;
  2769	}
  2770	late_initcall(printk_late_init);
  2771	

---
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