Hi Long, [auto build test WARNING on robh/for-next] [also build test WARNING on v4.10-rc8 next-20170216] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Long-Cheng/add-uart-DMA-function/20170216-200846 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 6.2.0 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=ia64 All warnings (new ones prefixed by >>): drivers/dma/mtk_uart_dma.c: In function 'mtk_dma_tx_write': >> drivers/dma/mtk_uart_dma.c:230:37: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare] if (atomic_inc_and_test(&c->entry) > 1) { ^ vim +/1 +230 drivers/dma/mtk_uart_dma.c 214 if (atomic_dec_and_test(&c->loopcnt)) 215 complete(&c->done); 216 } 217 } 218 219 static int mtk_dma_tx_write(struct dma_chan *chan) 220 { 221 struct mtk_chan *c = to_mtk_dma_chan(chan); 222 struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device); 223 struct timespec a, b; 224 int txcount = c->remain_size; 225 unsigned int tx_size = c->cfg.dst_addr_width*1024; 226 unsigned int len, left; 227 unsigned int wpt; 228 ktime_t begin, end; 229 > 230 if (atomic_inc_and_test(&c->entry) > 1) { 231 if (vchan_issue_pending(&c->vc) && !c->desc) { 232 spin_lock(&mtkd->lock); 233 list_add_tail(&c->node, &mtkd->pending); 234 spin_unlock(&mtkd->lock); 235 tasklet_schedule(&mtkd->task); 236 } 237 } else { 238 while (mtk_dma_chan_read(c, VFF_LEFT_SIZE) >= c->trig) { --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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