On 3/23/23 08:58, Naresh Kamboju wrote: > Following multiple build warnings / errors noticed while building > Linux next-20230323 with clang-16 for x86_64. > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> > > Build warnings / errors: > --------- > mm/mmap.c:939:11: error: variable 'next' is used uninitialized > whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] > else if (!curr) > ^~~~~ > mm/mmap.c:952:15: note: uninitialized use occurs here > merge_next = next && mpol_equal(policy, vma_policy(next)) && > ^~~~ > mm/mmap.c:939:7: note: remove the 'if' if its condition is always true > else if (!curr) > ^~~~~~~~~~ > mm/mmap.c:912:36: note: initialize the variable 'next' to silence this warning > struct vm_area_struct *curr, *next, *res; > ^ > = NULL Same issue as https://lore.kernel.org/all/CA%2BG9fYvBxp38KEggtvtvVtGMaSBdL3NDV9ns%3DZi9-Jtx7H9g1A@xxxxxxxxxxxxxx/ Thus already resolved in the next -next hopefully. > 1 error generated. > make[3]: *** [scripts/Makefile.build:252: mm/mmap.o] Error 1 > > mm/vmalloc.c:3543:6: error: variable 'remains' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/vmalloc.c:3587:17: note: uninitialized use occurs here > return count - remains + zero_iter(iter, remains); > ^~~~~~~ > mm/vmalloc.c:3543:2: note: remove the 'if' if its condition is always false > if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > mm/vmalloc.c:3539:6: error: variable 'remains' is used uninitialized > whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized] > if (!vb) > ^~~ > mm/vmalloc.c:3587:17: note: uninitialized use occurs here > return count - remains + zero_iter(iter, remains); > ^~~~~~~ > mm/vmalloc.c:3539:2: note: remove the 'if' if its condition is always false > if (!vb) > ^~~~~~~~ > mm/vmalloc.c:3524:16: note: initialize the variable 'remains' to > silence this warning > size_t remains, n; > ^ > = 0 > 2 errors generated. > make[3]: *** [scripts/Makefile.build:252: mm/vmalloc.o] Error 1 > make[3]: Target 'mm/' not remade because of errors. > > steps to reproduce: > ---------- > > tuxmake \ > --runtime podman \ > --target-arch x86_64 \ > --toolchain clang-16 LLVM=1 LLVM_IAS=1 \ > --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2NOjxURhByyb4dR3Ld788iuYvAR/config > > Related discussion on mailing list, > - https://lore.kernel.org/llvm/202303231055.DeninwHS-lkp@xxxxxxxxx/ > - https://lore.kernel.org/llvm/14c60785-2427-45db-9613-683410ff6802@lucifer.local/T/#t > > > -- > Linaro LKFT > https://lkft.linaro.org >
