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102494e6776f316b6cf2924976681d790f278cf1 >> commit: 9a655bd0773b41af6d8515502de102544f3ec4c1 [169/175] mm-huge_memoryc-introduce-folio_split_unmapped-v2 >> config: i386-buildonly-randconfig-002-20251119 (https://download.01.org/0day-ci/archive/20251120/202511200534.o4hsMNEt-lkp@intel.com/config) >> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) >> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251120/202511200534.o4hsMNEt-lkp@intel.com/reproduce) >> >> If you fix the issue in a separate patch/commit (i.e. not just a new version of >> the same patch/commit), kindly add following tags >> | Reported-by: kernel test robot >> | Closes: https://lore.kernel.org/oe-kbuild-all/202511200534.o4hsMNEt-lkp@intel.com/ >> >> All errors (new ones prefixed by >>): >> >>>> ld.lld: error: undefined symbol: shmem_uncharge >> >>> referenced by huge_memory.c:4053 (mm/huge_memory.c:4053) >> >>> mm/huge_memory.o:(__folio_split) in archive vmlinux.a >> > > On first glance it seems a bit strange since I did not change the use of shmem_uncharge, the > computation of nr_shmem_dropped did change. I see the config has CONFIG_SHMEM not set, I wonder > why this triggers with my changes only. > > I've tried reproducing with clang-21 and the provided configuration without any success. > My command line was CC=clang-21 and LD=ld.lld-21, but I am going to try with the script mentioned > I've done more testing and followed the instructions provided to reproduce the problem with the provided config (CONFIG_SHMEM=n) 1. I cannot reproduce the issue with COMPILER=clang-21 2. I can reproduce the issue with COMPILER=clang-20 Turns out the compiler does not like my change because it can no longer predict if nr_shmem_dropped is 0 and thus optimize out the call to shmem_uncharge(), which it did prior to the change Looks like I need to use if (shmem_mapping(mapping) && nr_shmem_dropped) shmem_uncharge(mapping->host, nr_shmem_dropped); Fun times :) Balbir