Hi Andrew, It's probably a bug fix that unveils the link errors. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f921b263d9602fb7873710c2df70671f2ffcf658 commit: 0585aae2b6b48d94a903a1e4d51751204a46ea61 [4332/4339] x86-atomic-move-__atomic_add_unless-out-of-line-fix config: um-allnoconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 0585aae2b6b48d94a903a1e4d51751204a46ea61 # save the attached .config to linux build tree make ARCH=um All errors (new ones prefixed by >>): kernel/built-in.o: In function `copy_process.isra.10.part.11': >> fork.c:(.text+0xf59): undefined reference to `__arch_atomic_add_unless' kernel/built-in.o: In function `get_mm_exe_file': >> (.text+0x1818): undefined reference to `__arch_atomic_add_unless' kernel/built-in.o: In function `get_task_exe_file': (.text+0x1878): undefined reference to `__arch_atomic_add_unless' kernel/built-in.o: In function `get_task_cred': (.text+0x18383): undefined reference to `__arch_atomic_add_unless' kernel/built-in.o: In function `prepare_kernel_cred': (.text+0x186cd): undefined reference to `__arch_atomic_add_unless' kernel/built-in.o:(.text+0x2137d): more undefined references to `__arch_atomic_add_unless' follow collect2: error: ld returned 1 exit status --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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