linux-kernel - [l1k:smsc95xx_5.17 209/887] drivers/dma/bcm2835-dma.c:1104:5: warning: no previous prototype for 'bcm2711_dma40_memcpy

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Date:   Fri, 8 Apr 2022 21:17:55 +0800
From:   kernel test robot <lkp@...el.com>
To:     Phil Elwell <phil@...pberrypi.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dom Cobley <popcornmix@...il.com>
Subject: [l1k:smsc95xx_5.17 209/887] drivers/dma/bcm2835-dma.c:1104:5:
 warning: no previous prototype for 'bcm2711_dma40_memcpy_init'

tree:   https://github.com/l1k/linux smsc95xx_5.17
head:   05d68ced287b30f62f18f95b5476135ef669804a
commit: 92eab2543e8b86cf7660e0cc70d5aee4313cbe58 [209/887] bcm2835-dma: Add proper 40-bit DMA support
config: arm-multi_v7_defconfig (https://download.01.org/0day-ci/archive/20220408/202204082125.AHZubaGl-lkp@intel.com/config)
compiler: arm-linux-gnueabi-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/92eab2543e8b86cf7660e0cc70d5aee4313cbe58
        git remote add l1k https://github.com/l1k/linux
        git fetch --no-tags l1k smsc95xx_5.17
        git checkout 92eab2543e8b86cf7660e0cc70d5aee4313cbe58
        # 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=arm SHELL=/bin/bash drivers/dma/

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/dma/bcm2835-dma.c:1104:5: warning: no previous prototype for 'bcm2711_dma40_memcpy_init' [-Wmissing-prototypes]
    1104 | int bcm2711_dma40_memcpy_init(void)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma/bcm2835-dma.c:1119:6: warning: no previous prototype for 'bcm2711_dma40_memcpy' [-Wmissing-prototypes]
    1119 | void bcm2711_dma40_memcpy(dma_addr_t dst, dma_addr_t src, size_t size)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +/bcm2711_dma40_memcpy_init +1104 drivers/dma/bcm2835-dma.c

  1103	
> 1104	int bcm2711_dma40_memcpy_init(void)
  1105	{
  1106		if (!memcpy_parent)
  1107			return -EPROBE_DEFER;
  1108	
  1109		if (!memcpy_chan)
  1110			return -EINVAL;
  1111	
  1112		if (!memcpy_scb)
  1113			return -ENOMEM;
  1114	
  1115		return 0;
  1116	}
  1117	EXPORT_SYMBOL(bcm2711_dma40_memcpy_init);
  1118	
> 1119	void bcm2711_dma40_memcpy(dma_addr_t dst, dma_addr_t src, size_t size)
  1120	{
  1121		struct bcm2711_dma40_scb *scb = memcpy_scb;
  1122		unsigned long flags;
  1123	
  1124		if (!scb) {
  1125			pr_err("bcm2711_dma40_memcpy not initialised!\n");
  1126			return;
  1127		}
  1128	
  1129		spin_lock_irqsave(&memcpy_lock, flags);
  1130	
  1131		scb->ti = 0;
  1132		scb->src = lower_32_bits(src);
  1133		scb->srci = upper_32_bits(src) | BCM2711_DMA40_MEMCPY_XFER_INFO;
  1134		scb->dst = lower_32_bits(dst);
  1135		scb->dsti = upper_32_bits(dst) | BCM2711_DMA40_MEMCPY_XFER_INFO;
  1136		scb->len = size;
  1137		scb->next_cb = 0;
  1138	
  1139		writel((u32)(memcpy_scb_dma >> 5), memcpy_chan + BCM2711_DMA40_CB);
  1140		writel(BCM2711_DMA40_MEMCPY_FLAGS + BCM2711_DMA40_ACTIVE,
  1141		       memcpy_chan + BCM2711_DMA40_CS);
  1142	
  1143		/* Poll for completion */
  1144		while (!(readl(memcpy_chan + BCM2711_DMA40_CS) & BCM2711_DMA40_END))
  1145			cpu_relax();
  1146	
  1147		writel(BCM2711_DMA40_END, memcpy_chan + BCM2711_DMA40_CS);
  1148	
  1149		spin_unlock_irqrestore(&memcpy_lock, flags);
  1150	}
  1151	EXPORT_SYMBOL(bcm2711_dma40_memcpy);
  1152	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp