[kbuild-all] [intel-linux-intel-lts:5.4/yocto 1129/1142] drivers/dma/dmaengine.c:603:18: warning: no previous prototype for 'dma_get_slave_channel'

tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: de9c6920ba5aa70a57dfe39b7f99a9e287ac4c50 [1129/1142] dmaengine: Move dma_get_{,any_}slave_channel() to private dmaengine.h config: microblaze-randconfig-r005-20210517 (attached as .config) compiler: microblaze-linux-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 # https://github.com/intel/linux-intel-lts/commit/de9c6920ba5aa70a57dfe39b7... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout de9c6920ba5aa70a57dfe39b7f99a9e287ac4c50 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=microblaze If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 603 | struct dma_chan *dma_get_slave_channel(struct dma_chan *chan) | ^~~~~~~~~~~~~~~~~~~~~ 634 | struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +/dma_get_slave_channel +603 drivers/dma/dmaengine.c 7bd903c5ca47fd Peter Ujfalusi 2015-12-14 598 59b5ec21446b92 Dan Williams 2009-01-06 599 /** 19d643d68bd678 Stefan Agner 2015-06-01 600 * dma_get_slave_channel - try to get specific channel exclusively 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 601 * @chan: target channel 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 602 */ 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 @603 struct dma_chan *dma_get_slave_channel(struct dma_chan *chan) 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 604 { 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 605 int err = -EBUSY; 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 606 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 607 /* lock against __dma_request_channel */ 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 608 mutex_lock(&dma_list_mutex); 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 609 d9a6c8f52d1039 Vinod Koul 2013-08-19 610 if (chan->client_count == 0) { 214fc4e423ff38 Peter Ujfalusi 2015-09-24 611 struct dma_device *device = chan->device; 214fc4e423ff38 Peter Ujfalusi 2015-09-24 612 214fc4e423ff38 Peter Ujfalusi 2015-09-24 613 dma_cap_set(DMA_PRIVATE, device->cap_mask); 214fc4e423ff38 Peter Ujfalusi 2015-09-24 614 device->privatecnt++; 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 615 err = dma_chan_get(chan); 214fc4e423ff38 Peter Ujfalusi 2015-09-24 616 if (err) { ef859312c3a16b Jarkko Nikula 2016-03-14 617 dev_dbg(chan->device->dev, ef859312c3a16b Jarkko Nikula 2016-03-14 618 "%s: failed to get %s: (%d)\n", d9a6c8f52d1039 Vinod Koul 2013-08-19 619 __func__, dma_chan_name(chan), err); 214fc4e423ff38 Peter Ujfalusi 2015-09-24 620 chan = NULL; 214fc4e423ff38 Peter Ujfalusi 2015-09-24 621 if (--device->privatecnt == 0) 214fc4e423ff38 Peter Ujfalusi 2015-09-24 622 dma_cap_clear(DMA_PRIVATE, device->cap_mask); 214fc4e423ff38 Peter Ujfalusi 2015-09-24 623 } d9a6c8f52d1039 Vinod Koul 2013-08-19 624 } else 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 625 chan = NULL; 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 626 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 627 mutex_unlock(&dma_list_mutex); 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 628 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 629 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 630 return chan; 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 631 } 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 632 EXPORT_SYMBOL_GPL(dma_get_slave_channel); 7bb587f4eef8f7 Zhangfei Gao 2013-06-28 633 8010dad55a0ab0 Stephen Warren 2013-11-26 @634 struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) 8010dad55a0ab0 Stephen Warren 2013-11-26 635 { 8010dad55a0ab0 Stephen Warren 2013-11-26 636 dma_cap_mask_t mask; 8010dad55a0ab0 Stephen Warren 2013-11-26 637 struct dma_chan *chan; 8010dad55a0ab0 Stephen Warren 2013-11-26 638 8010dad55a0ab0 Stephen Warren 2013-11-26 639 dma_cap_zero(mask); 8010dad55a0ab0 Stephen Warren 2013-11-26 640 dma_cap_set(DMA_SLAVE, mask); 8010dad55a0ab0 Stephen Warren 2013-11-26 641 8010dad55a0ab0 Stephen Warren 2013-11-26 642 /* lock against __dma_request_channel */ 8010dad55a0ab0 Stephen Warren 2013-11-26 643 mutex_lock(&dma_list_mutex); 8010dad55a0ab0 Stephen Warren 2013-11-26 644 7bd903c5ca47fd Peter Ujfalusi 2015-12-14 645 chan = find_candidate(device, &mask, NULL, NULL); 8010dad55a0ab0 Stephen Warren 2013-11-26 646 8010dad55a0ab0 Stephen Warren 2013-11-26 647 mutex_unlock(&dma_list_mutex); 8010dad55a0ab0 Stephen Warren 2013-11-26 648 7bd903c5ca47fd Peter Ujfalusi 2015-12-14 649 return IS_ERR(chan) ? NULL : chan; 8010dad55a0ab0 Stephen Warren 2013-11-26 650 } 8010dad55a0ab0 Stephen Warren 2013-11-26 651 EXPORT_SYMBOL_GPL(dma_get_any_slave_channel); 8010dad55a0ab0 Stephen Warren 2013-11-26 652 :::::: The code at line 603 was first introduced by commit :::::: 7bb587f4eef8f71ce589f360ab99bb54ab0fc85d dmaengine: add interface of dma_get_slave_channel :::::: TO: Zhangfei Gao <zhangfei.gao(a)linaro.org&gt; :::::: CC: Vinod Koul <vinod.koul(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org