[kbuild-all] drivers/dma/imx-sdma.c:1334:23: warning: comparison of unsigned expression >= 0 is always true

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8b6ddd10d678bebec32381f71b6b420bafc43ad0 commit: 25962e1a7f1d522f1b57ead2f266fab570042a70 dmaengine: imx-sdma: Fix the event id check to include RX event for UART6 date: 4 months ago config: arm-randconfig-r006-20200621 (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 25962e1a7f1d522f1b57ead2f266fab570042a70 # 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(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): drivers/dma/imx-sdma.c: In function 'sdma_free_chan_resources': 1334 | if (sdmac->event_id0 >= 0) | ^~ drivers/dma/imx-sdma.c: In function 'sdma_config': drivers/dma/imx-sdma.c:1635:23: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 1635 | if (sdmac->event_id0 >= 0) { | ^~ vim +1334 drivers/dma/imx-sdma.c 1324 1325 static void sdma_free_chan_resources(struct dma_chan *chan) 1326 { 1327 struct sdma_channel *sdmac = to_sdma_chan(chan); 1328 struct sdma_engine *sdma = sdmac->sdma; 1329 1330 sdma_terminate_all(chan); 1331 1332 sdma_channel_synchronize(chan); 1333 1335 sdma_event_disable(sdmac, sdmac->event_id0); 1336 if (sdmac->event_id1) 1337 sdma_event_disable(sdmac, sdmac->event_id1); 1338 1339 sdmac->event_id0 = 0; 1340 sdmac->event_id1 = 0; 1341 sdmac->context_loaded = false; 1342 1343 sdma_set_channel_priority(sdmac, 0); 1344 1345 clk_disable(sdma->clk_ipg); 1346 clk_disable(sdma->clk_ahb); 1347 } 1348 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org