On Wed, Oct 26, 2022 at 01:43:48AM +0530, Naresh Kamboju wrote: > Following build warning / errors noticed while building x86_64 with clang > on Linux next-20221025 tag. > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> > > ## Build > * kernel: 6.1.0-rc2 > * git: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next > * git branch: master > * git commit: 89bf6e28373beef9577fa71f996a5f73a569617c > * git describe: next-20221025 > * test details: > https://qa-reports.linaro.org/lkft/linux-next-master-sanity/build/next-20221025 > > ## Test Regressions (compared to next-20221024) > Regressions found on x86_64: > > - clang-nightly-lkftconfig > - clang-12-lkftconfig > - clang-14-lkftconfig > - clang-13-lkftconfig > - clang-14-lkftconfig-kcsan > > make --silent --keep-going --jobs=8 > O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1 > ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'HOSTCC=sccache clang' > 'CC=sccache clang' > mm/khugepaged.c:1729:7: error: variable 'index' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (!xas_nomem(&xas, GFP_KERNEL)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:2063:47: note: uninitialized use occurs here > trace_mm_khugepaged_collapse_file(mm, hpage, index, is_shmem, > ^~~~~ > mm/khugepaged.c:1729:3: note: remove the 'if' if its condition is always false > if (!xas_nomem(&xas, GFP_KERNEL)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:1716:6: error: variable 'index' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (result != SCAN_SUCCEED) > ^~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:2063:47: note: uninitialized use occurs here > trace_mm_khugepaged_collapse_file(mm, hpage, index, is_shmem, > ^~~~~ > mm/khugepaged.c:1716:2: note: remove the 'if' if its condition is always false > if (result != SCAN_SUCCEED) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:1705:15: note: initialize the variable 'index' to > silence this warning > pgoff_t index, end = start + HPAGE_PMD_NR; > ^ > = 0 > mm/khugepaged.c:1729:7: error: variable 'nr' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (!xas_nomem(&xas, GFP_KERNEL)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:2064:15: note: uninitialized use occurs here > addr, file, nr, result); > ^~ > mm/khugepaged.c:1729:3: note: remove the 'if' if its condition is always false > if (!xas_nomem(&xas, GFP_KERNEL)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:1716:6: error: variable 'nr' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (result != SCAN_SUCCEED) > ^~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:2064:15: note: uninitialized use occurs here > addr, file, nr, result); > ^~ > mm/khugepaged.c:1716:2: note: remove the 'if' if its condition is always false > if (result != SCAN_SUCCEED) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/khugepaged.c:1710:8: note: initialize the variable 'nr' to silence > this warning > int nr; > ^ > = 0 > 4 errors generated. > make[3]: *** [scripts/Makefile.build:250: mm/khugepaged.o] Error 1 I sent https://lore.kernel.org/20221025173407.3423241-1-nathan@xxxxxxxxxx/ for this earlier today. Cheers, Nathan
