On Sun, Mar 14, 2021 at 12:08 PM kernel test robot <lkp(a)intel.com&gt; wrote: > CC: linux-kernel(a)vger.kernel.org > TO: Guo Ren <guoren(a)linux.alibaba.com&gt; > CC: Palmer Dabbelt <palmerdabbelt(a)google.com&gt; > > Hi Guo, > > FYI, the error/warning still remains. > > tree: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 88fe49249c99de14e543c632a46248d85411ab9e > commit: afc76b8b80112189b6f11e67e19cf58301944814 riscv: Using > PATCHABLE_FUNCTION_ENTRY instead of MCOUNT > date: 8 weeks ago > config: riscv-randconfig-r003-20210314 (attached as .config) > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project > 7ee96429a0b057bcc97331a6a762fc3cd00aed61) > 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 riscv cross compiling tool for clang build > # apt-get install binutils-riscv64-linux-gnu > # > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... > git remote add linus > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout afc76b8b80112189b6f11e67e19cf58301944814 > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross > ARCH=riscv > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > All errors (new ones prefixed by >>): > > >> clang-13: error: unsupported option '-fpatchable-function-entry=8' for > target 'riscv64-unknown-linux-gnu' > I implemented clang -fpatchable-function-entry for x86 and AArch64. I am working on the RISC-V support. It should be available from 13.0.0 onwards.