linux-kernel - [jirislaby:devel 57/73] include/linux/consolemap.h:50:16: error: 'c' undeclared; did you mean 'vc'?

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Date:   Wed, 4 May 2022 22:51:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [jirislaby:devel 57/73] include/linux/consolemap.h:50:16: error: 'c'
 undeclared; did you mean 'vc'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel
head:   fab642eca5e0ca41e656c8a0685cadf975b7ff88
commit: b2c621c008e401176daf2b3a1ca78fa8d6ff01af [57/73] consolemap.h: convert macros to static inlines
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220504/202205042242.hQmWKqlu-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commit/?id=b2c621c008e401176daf2b3a1ca78fa8d6ff01af
        git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git
        git fetch --no-tags jirislaby devel
        git checkout b2c621c008e401176daf2b3a1ca78fa8d6ff01af
        # 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 as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/vt_kern.h:16,
                    from kernel/panic.c:19:
   include/linux/consolemap.h: In function 'conv_uni_to_8bit':
>> include/linux/consolemap.h:50:16: error: 'c' undeclared (first use in this function); did you mean 'vc'?
      50 |         return c & 0xff;
         |                ^
         |                vc
   include/linux/consolemap.h:50:16: note: each undeclared identifier is reported only once for each function it appears in
   kernel/panic.c: In function '__warn':
   kernel/panic.c:617:17: warning: function '__warn' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     617 |                 vprintk(args->fmt, args->args);
         |                 ^~~~~~~
   kernel/panic.c: At top level:
   kernel/panic.c:662:6: warning: no previous prototype for '__warn_printk' [-Wmissing-prototypes]
     662 | void __warn_printk(const char *fmt, ...)
         |      ^~~~~~~~~~~~~
   kernel/panic.c: In function '__warn_printk':
   kernel/panic.c:669:9: warning: function '__warn_printk' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     669 |         vprintk(fmt, args);
         |         ^~~~~~~
--
   In file included from include/linux/vt_kern.h:16,
                    from lib/bust_spinlocks.c:17:
   include/linux/consolemap.h: In function 'conv_uni_to_8bit':
>> include/linux/consolemap.h:50:16: error: 'c' undeclared (first use in this function); did you mean 'vc'?
      50 |         return c & 0xff;
         |                ^
         |                vc
   include/linux/consolemap.h:50:16: note: each undeclared identifier is reported only once for each function it appears in


vim +50 include/linux/consolemap.h

    47	
    48	static inline int conv_uni_to_8bit(u32 uni)
    49	{
  > 50		return c & 0xff;
    51	}
    52	

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