linux-kernel - drivers/net/wireless/realtek/rtw88/rtw8821c.c:71:8: warning: type qualifiers ignored on function return type

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Date:   Thu, 27 Aug 2020 18:36:30 +0800
From:   kernel test robot <lkp@...el.com>
To:     Tzu-En Huang <tehuang@...ltek.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>,
        Yan-Hsuan Chuang <yhchuang@...ltek.com>
Subject: drivers/net/wireless/realtek/rtw88/rtw8821c.c:71:8: warning: type
 qualifiers ignored on function return type

Hi Tzu-En,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   15bc20c6af4ceee97a1f90b43c0e386643c071b4
commit: f745eb9ca5bf823bc5c0f82a434cefb41c57844e rtw88: 8821c: Add 8821CE to Kconfig and Makefile
date:   6 weeks ago
config: arm-randconfig-r012-20200827 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
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
        git checkout f745eb9ca5bf823bc5c0f82a434cefb41c57844e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All warnings (new ones prefixed by >>):

>> drivers/net/wireless/realtek/rtw88/rtw8821c.c:71:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
      71 | static const u8 rtw8821c_get_swing_index(struct rtw_dev *rtwdev)
         |        ^~~~~

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f745eb9ca5bf823bc5c0f82a434cefb41c57844e
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout f745eb9ca5bf823bc5c0f82a434cefb41c57844e
vim +71 drivers/net/wireless/realtek/rtw88/rtw8821c.c

3a4312828ce13e1 Tzu-En Huang 2020-06-03  70  
3a4312828ce13e1 Tzu-En Huang 2020-06-03 @71  static const u8 rtw8821c_get_swing_index(struct rtw_dev *rtwdev)
3a4312828ce13e1 Tzu-En Huang 2020-06-03  72  {
3a4312828ce13e1 Tzu-En Huang 2020-06-03  73  	u8 i = 0;
3a4312828ce13e1 Tzu-En Huang 2020-06-03  74  	u32 swing, table_value;
3a4312828ce13e1 Tzu-En Huang 2020-06-03  75  
3a4312828ce13e1 Tzu-En Huang 2020-06-03  76  	swing = rtw_read32_mask(rtwdev, REG_TXSCALE_A, 0xffe00000);
3a4312828ce13e1 Tzu-En Huang 2020-06-03  77  	for (i = 0; i < ARRAY_SIZE(rtw8821c_txscale_tbl); i++) {
3a4312828ce13e1 Tzu-En Huang 2020-06-03  78  		table_value = rtw8821c_txscale_tbl[i];
3a4312828ce13e1 Tzu-En Huang 2020-06-03  79  		if (swing == table_value)
3a4312828ce13e1 Tzu-En Huang 2020-06-03  80  			break;
3a4312828ce13e1 Tzu-En Huang 2020-06-03  81  	}
3a4312828ce13e1 Tzu-En Huang 2020-06-03  82  
3a4312828ce13e1 Tzu-En Huang 2020-06-03  83  	return i;
3a4312828ce13e1 Tzu-En Huang 2020-06-03  84  }
3a4312828ce13e1 Tzu-En Huang 2020-06-03  85  

:::::: The code at line 71 was first introduced by commit
:::::: 3a4312828ce13e1645fd3af76e4314a2623b3361 rtw88: 8821c: add power tracking

:::::: TO: Tzu-En Huang <tehuang@...ltek.com>
:::::: CC: Kalle Valo <kvalo@...eaurora.org>

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

Download attachment ".config.gz" of type "application/gzip" (31903 bytes)