[kbuild-all] [linux-next:master 6537/8629] drivers/dma/sf-pdma/sf-pdma.c:287:23: warning: unused variable 'desc'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 860461e4fcaa76200d2d1a53523e0ff7be92e6e8 commit: 8f6b6d0606023c8403ac04ba42177ecbb55769f6 [6537/8629] dmaengine: sf-pdma: Fix an error that calls callback twice config: mips-randconfig-r014-20200917 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1321160a26e7e489baf9b10d6de90a342f898960) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu git checkout 8f6b6d0606023c8403ac04ba42177ecbb55769f6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): struct sf_pdma_desc = chan->desc; ^ fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 1321160a26e7e489baf9b10d6de90a342f898960) Target: mips-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-1321160a26/bin clang-12: note: diagnostic msg: Makefile arch drivers include kernel scripts source usr # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 8f6b6d0606023c8403ac04ba42177ecbb55769f6 vim +/desc +287 drivers/dma/sf-pdma/sf-pdma.c 6973886ad58e6b4 Green Wan 2019-11-07 283 6973886ad58e6b4 Green Wan 2019-11-07 284 static void sf_pdma_donebh_tasklet(unsigned long arg) 6973886ad58e6b4 Green Wan 2019-11-07 285 { 6973886ad58e6b4 Green Wan 2019-11-07 286 struct sf_pdma_chan *chan = (struct sf_pdma_chan *)arg; 6973886ad58e6b4 Green Wan 2019-11-07 @287 struct sf_pdma_desc *desc = chan->desc; 6973886ad58e6b4 Green Wan 2019-11-07 288 unsigned long flags; 6973886ad58e6b4 Green Wan 2019-11-07 289 6973886ad58e6b4 Green Wan 2019-11-07 290 spin_lock_irqsave(&chan->lock, flags); 6973886ad58e6b4 Green Wan 2019-11-07 291 if (chan->xfer_err) { 6973886ad58e6b4 Green Wan 2019-11-07 292 chan->retries = MAX_RETRY; 6973886ad58e6b4 Green Wan 2019-11-07 293 chan->status = DMA_COMPLETE; 6973886ad58e6b4 Green Wan 2019-11-07 294 chan->xfer_err = false; 6973886ad58e6b4 Green Wan 2019-11-07 295 } 6973886ad58e6b4 Green Wan 2019-11-07 296 spin_unlock_irqrestore(&chan->lock, flags); 6973886ad58e6b4 Green Wan 2019-11-07 297 8f6b6d0606023c8 Brad Kim 2020-09-03 298 spin_lock_irqsave(&chan->vchan.lock, flags); 8f6b6d0606023c8 Brad Kim 2020-09-03 299 list_del(&chan->desc->vdesc.node); 8f6b6d0606023c8 Brad Kim 2020-09-03 300 vchan_cookie_complete(&chan->desc->vdesc); 8f6b6d0606023c8 Brad Kim 2020-09-03 301 spin_unlock_irqrestore(&chan->vchan.lock, flags); 6973886ad58e6b4 Green Wan 2019-11-07 302 } 6973886ad58e6b4 Green Wan 2019-11-07 303 :::::: The code at line 287 was first introduced by commit :::::: 6973886ad58e6b4988813331abb76ae0b364a9c2 dmaengine: sf-pdma: add platform DMA support for HiFive Unleashed A00 :::::: TO: Green Wan <green.wan(a)sifive.com&gt; :::::: CC: Vinod Koul <vkoul(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org