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Date:   Mon, 31 Jan 2022 20:27:32 +0800
From:   kernel test robot <lkp@intel.com>
To:     Yizhuo Zhai <yzhai003@ucr.edu>
Cc:     kbuild-all@lists.01.org, linux-fbdev@vger.kernel.org,
        Xiyu Yang <xiyuyang19@fudan.edu.cn>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Helge Deller <deller@gmx.de>, Zheyu Ma <zheyuma97@gmail.com>,
        linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>,
        Yizhuo Zhai <yzhai003@ucr.edu>, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] fbdev: fbmem: Fix the implicit type casting
Message-ID: <202201311943.VXU6K1gH-lkp@intel.com>
References: <20220131065719.1552958-1-yzhai003@ucr.edu>
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In-Reply-To: <20220131065719.1552958-1-yzhai003@ucr.edu>
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Hi Yizhuo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.17-rc2 next-20220131]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yizhuo-Zhai/fbdev-fbmem-Fix-the-implicit-type-casting/20220131-150528
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 26291c54e111ff6ba87a164d85d4a4e134b7315c
config: i386-randconfig-c001-20220131 (https://download.01.org/0day-ci/archive/20220131/202201311943.VXU6K1gH-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/b8f540468e70290c8278fc2611adc2f9b38f821f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yizhuo-Zhai/fbdev-fbmem-Fix-the-implicit-type-casting/20220131-150528
        git checkout b8f540468e70290c8278fc2611adc2f9b38f821f
        # save the config file to linux build tree
        mkdir build_dir
        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@intel.com>

All errors (new ones prefixed by >>):

>> drivers/video/fbdev/core/fbmem.c:1067:1: error: conflicting types for 'fb_blank'
    1067 | fb_blank(struct fb_info *info, unsigned long blank)
         | ^~~~~~~~
   In file included from drivers/video/fbdev/core/fbmem.c:34:
   include/linux/fb.h:591:12: note: previous declaration of 'fb_blank' was here
     591 | extern int fb_blank(struct fb_info *info, int blank);
         |            ^~~~~~~~
   In file included from include/linux/linkage.h:7,
                    from arch/x86/include/asm/cache.h:5,
                    from include/linux/cache.h:6,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:19,
                    from include/linux/module.h:13,
                    from drivers/video/fbdev/core/fbmem.c:14:
   drivers/video/fbdev/core/fbmem.c:1086:15: error: conflicting types for 'fb_blank'
    1086 | EXPORT_SYMBOL(fb_blank);
         |               ^~~~~~~~
   include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL'
      98 |  extern typeof(sym) sym;       \
         |                     ^~~
   include/linux/export.h:160:34: note: in expansion of macro '__EXPORT_SYMBOL'
     160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
         |                                  ^~~~~~~~~~~~~~~
   include/linux/export.h:163:29: note: in expansion of macro '_EXPORT_SYMBOL'
     163 | #define EXPORT_SYMBOL(sym)  _EXPORT_SYMBOL(sym, "")
         |                             ^~~~~~~~~~~~~~
   drivers/video/fbdev/core/fbmem.c:1086:1: note: in expansion of macro 'EXPORT_SYMBOL'
    1086 | EXPORT_SYMBOL(fb_blank);
         | ^~~~~~~~~~~~~
   In file included from drivers/video/fbdev/core/fbmem.c:34:
   include/linux/fb.h:591:12: note: previous declaration of 'fb_blank' was here
     591 | extern int fb_blank(struct fb_info *info, int blank);
         |            ^~~~~~~~


vim +/fb_blank +1067 drivers/video/fbdev/core/fbmem.c

  1065	
  1066	int
> 1067	fb_blank(struct fb_info *info, unsigned long blank)
  1068	{
  1069		struct fb_event event;
  1070		int ret = -EINVAL;
  1071	
  1072		if (blank > FB_BLANK_POWERDOWN)
  1073			blank = FB_BLANK_POWERDOWN;
  1074	
  1075		event.info = info;
  1076		event.data = &blank;
  1077	
  1078		if (info->fbops->fb_blank)
  1079			ret = info->fbops->fb_blank(blank, info);
  1080	
  1081		if (!ret)
  1082			fb_notifier_call_chain(FB_EVENT_BLANK, &event);
  1083	
  1084		return ret;
  1085	}
  1086	EXPORT_SYMBOL(fb_blank);
  1087	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org