linux-kernel - [l1k:bcm2835_spi_clkcache 1/1] drivers/spi/spi-bcm2835.c:1048:6: warning: no previous prototype for 'bcm2835_spi_set

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Date:   Thu, 30 Sep 2021 15:54:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [l1k:bcm2835_spi_clkcache 1/1] drivers/spi/spi-bcm2835.c:1048:6:
 warning: no previous prototype for 'bcm2835_spi_set_clk'

tree:   https://github.com/l1k/linux bcm2835_spi_clkcache
head:   e46f7c6c25bbb03644fd48964df89fa755e0778b
commit: e46f7c6c25bbb03644fd48964df89fa755e0778b [1/1] spi: bcm2835: Avoid unnecessary recalculation of CLK register
config: h8300-randconfig-r023-20210930 (attached as .config)
compiler: h8300-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/l1k/linux/commit/e46f7c6c25bbb03644fd48964df89fa755e0778b
        git remote add l1k https://github.com/l1k/linux
        git fetch --no-tags l1k bcm2835_spi_clkcache
        git checkout e46f7c6c25bbb03644fd48964df89fa755e0778b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=h8300 

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/spi/spi-bcm2835.c:1048:6: warning: no previous prototype for 'bcm2835_spi_set_clk' [-Wmissing-prototypes]
    1048 | void bcm2835_spi_set_clk(struct bcm2835_spi *bs, struct spi_transfer *tfr)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/bcm2835_spi_set_clk +1048 drivers/spi/spi-bcm2835.c

  1047	
> 1048	void bcm2835_spi_set_clk(struct bcm2835_spi *bs, struct spi_transfer *tfr)
  1049	{
  1050		unsigned long spi_hz = bs->speed_hz = tfr->speed_hz;
  1051		unsigned long cdiv;
  1052	
  1053		if (spi_hz >= bs->clk_hz / 2) {
  1054			cdiv = 2; /* clk_hz/2 is the fastest we can go */
  1055		} else if (spi_hz) {
  1056			/* CDIV must be a multiple of two */
  1057			cdiv = DIV_ROUND_UP(bs->clk_hz, spi_hz);
  1058			cdiv += (cdiv % 2);
  1059	
  1060			if (cdiv >= 65536)
  1061				cdiv = 0; /* 0 is the slowest we can go */
  1062		} else {
  1063			cdiv = 0; /* 0 is the slowest we can go */
  1064		}
  1065	
  1066		tfr->effective_speed_hz = bs->effective_speed_hz =
  1067			cdiv ? (bs->clk_hz / cdiv) : (bs->clk_hz / 65536);
  1068	
  1069		bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv);
  1070	}
  1071	

---
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" (33048 bytes)