linux-kernel - [jsarha:topic/cros-sof-v4.14 8447/9354] kernel/panic.c:591:6: warning: no previous declaration for '__warn

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Date:   Fri, 17 Jun 2022 23:55:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Brian Norris <briannorris@...omium.org>,
        Grant Grundler <grundler@...omium.org>
Subject: [jsarha:topic/cros-sof-v4.14 8447/9354] kernel/panic.c:591:6:
 warning: no previous declaration for '__warn_printk'

tree:   https://github.com/jsarha/linux topic/cros-sof-v4.14
head:   6f750b16c322c9191168a3a97c427c90581d9144
commit: c4256ec7a28ebcf4371230422dceae6befc40836 [8447/9354] UPSTREAM: bug: fix "cut here" location for __WARN_TAINT architectures
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220617/202206172352.f6AzDAj9-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://github.com/jsarha/linux/commit/c4256ec7a28ebcf4371230422dceae6befc40836
        git remote add jsarha https://github.com/jsarha/linux
        git fetch --no-tags jsarha topic/cros-sof-v4.14
        git checkout c4256ec7a28ebcf4371230422dceae6befc40836
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   kernel/panic.c:61:13: warning: no previous declaration for 'panic_smp_self_stop' [-Wmissing-declarations]
    void __weak panic_smp_self_stop(void)
                ^~~~~~~~~~~~~~~~~~~
   kernel/panic.c:71:13: warning: no previous declaration for 'nmi_panic_self_stop' [-Wmissing-declarations]
    void __weak nmi_panic_self_stop(struct pt_regs *regs)
                ^~~~~~~~~~~~~~~~~~~
   kernel/panic.c:82:13: warning: no previous declaration for 'crash_smp_send_stop' [-Wmissing-declarations]
    void __weak crash_smp_send_stop(void)
                ^~~~~~~~~~~~~~~~~~~
   kernel/panic.c:516:6: warning: no previous declaration for '__warn' [-Wmissing-declarations]
    void __warn(const char *file, int line, void *caller, unsigned taint,
         ^~~~~~
   kernel/panic.c: In function '__warn':
   kernel/panic.c:533:3: warning: function '__warn' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
      vprintk(args->fmt, args->args);
      ^~~~~~~
   kernel/panic.c: At top level:
>> kernel/panic.c:591:6: warning: no previous declaration for '__warn_printk' [-Wmissing-declarations]
    void __warn_printk(const char *fmt, ...)
         ^~~~~~~~~~~~~
   kernel/panic.c: In function '__warn_printk':
   kernel/panic.c:598:2: warning: function '__warn_printk' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     vprintk(fmt, args);
     ^~~~~~~


vim +/__warn_printk +591 kernel/panic.c

   583	
   584	void warn_slowpath_null(const char *file, int line)
   585	{
   586		pr_warn(CUT_HERE);
   587		__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL, NULL);
   588	}
   589	EXPORT_SYMBOL(warn_slowpath_null);
   590	#else
 > 591	void __warn_printk(const char *fmt, ...)
   592	{
   593		va_list args;
   594	
   595		pr_warn(CUT_HERE);
   596	
   597		va_start(args, fmt);
   598		vprintk(fmt, args);
   599		va_end(args);
   600	}
   601	EXPORT_SYMBOL(__warn_printk);
   602	#endif
   603	

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