linux-kernel - [ogabbay:habanalabs-next 33/34] drivers/misc/habanalabs/gaudi/gaudi.c:5041:5: warning: no previous prototype for 'gaudi_get_dma_desc_list

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Date:   Tue, 12 Apr 2022 00:39:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ohad Sharabi <osharabi@...ana.ai>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Oded Gabbay <ogabbay@...nel.org>
Subject: [ogabbay:habanalabs-next 33/34]
 drivers/misc/habanalabs/gaudi/gaudi.c:5041:5: warning: no previous prototype
 for 'gaudi_get_dma_desc_list_size'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git habanalabs-next
head:   e3e6111dba082a2d77e80ae99a2de75adff9b875
commit: 7d3600a8f9ffc668f66678211d41eadb224a4dd8 [33/34] habanalabs: use for_each_sgtable_dma_sg for dma sgt
config: sparc-buildonly-randconfig-r006-20220411 (https://download.01.org/0day-ci/archive/20220412/202204120049.nXnmmmRn-lkp@intel.com/config)
compiler: sparc64-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://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git/commit/?id=7d3600a8f9ffc668f66678211d41eadb224a4dd8
        git remote add ogabbay https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git
        git fetch --no-tags ogabbay habanalabs-next
        git checkout 7d3600a8f9ffc668f66678211d41eadb224a4dd8
        # 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=sparc SHELL=/bin/bash drivers/misc/

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/misc/habanalabs/gaudi/gaudi.c:5041:5: warning: no previous prototype for 'gaudi_get_dma_desc_list_size' [-Wmissing-prototypes]
    5041 | u32 gaudi_get_dma_desc_list_size(struct hl_device *hdev,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/gaudi_get_dma_desc_list_size +5041 drivers/misc/habanalabs/gaudi/gaudi.c

  5040	
> 5041	u32 gaudi_get_dma_desc_list_size(struct hl_device *hdev,
  5042						struct sg_table *sgt)
  5043	{
  5044		struct scatterlist *sg, *sg_next_iter;
  5045		u32 count, dma_desc_cnt;
  5046		u64 len, len_next;
  5047		dma_addr_t addr, addr_next;
  5048	
  5049		dma_desc_cnt = 0;
  5050	
  5051		for_each_sgtable_dma_sg(sgt, sg, count) {
  5052			len = sg_dma_len(sg);
  5053			addr = sg_dma_address(sg);
  5054	
  5055			if (len == 0)
  5056				break;
  5057	
  5058			while ((count + 1) < sgt->nents) {
  5059				sg_next_iter = sg_next(sg);
  5060				len_next = sg_dma_len(sg_next_iter);
  5061				addr_next = sg_dma_address(sg_next_iter);
  5062	
  5063				if (len_next == 0)
  5064					break;
  5065	
  5066				if ((addr + len == addr_next) &&
  5067					(len + len_next <= DMA_MAX_TRANSFER_SIZE)) {
  5068					len += len_next;
  5069					count++;
  5070					sg = sg_next_iter;
  5071				} else {
  5072					break;
  5073				}
  5074			}
  5075	
  5076			dma_desc_cnt++;
  5077		}
  5078	
  5079		return dma_desc_cnt * sizeof(struct packet_lin_dma);
  5080	}
  5081	

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