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SubjectRe: [PATCH] fbdev: fbmem: Fix the implicit type casting
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: riscv-randconfig-r042-20220130 (https://download.01.org/0day-ci/archive/20220131/202201311936.5edxEvQY-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# 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
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash drivers/video/

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'; have 'int(struct fb_info *, long unsigned int)'
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' with type 'int(struct fb_info *, int)'
591 | extern int fb_blank(struct fb_info *info, int blank);
| ^~~~~~~~
In file included from include/linux/linkage.h:7,
from include/linux/kernel.h:17,
from include/linux/cpumask.h:10,
from include/linux/smp.h:13,
from arch/riscv/include/asm/mmiowb.h:12,
from arch/riscv/include/asm/mmio.h:15,
from arch/riscv/include/asm/clint.h:10,
from arch/riscv/include/asm/timex.h:15,
from include/linux/timex.h:65,
from include/linux/time32.h:13,
from include/linux/time.h:60,
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'; have 'int(struct fb_info *, long unsigned int)'
1086 | EXPORT_SYMBOL(fb_blank);
| ^~~~~~~~
include/linux/export.h:98:28: note: in definition of macro '___EXPORT_SYMBOL'
98 | extern typeof(sym) sym; \
| ^~~
include/linux/export.h:160:41: note: in expansion of macro '__EXPORT_SYMBOL'
160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
| ^~~~~~~~~~~~~~~
include/linux/export.h:163:41: 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' with type 'int(struct fb_info *, int)'
591 | extern int fb_blank(struct fb_info *info, int blank);
| ^~~~~~~~


vim +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

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