The following build warnings were noticed while building selftests/mm with clang nightly toolchain for arm64 and x86_64 architectures.

Regressions found on arm64 and x86_64 - Build/clang-nightly-lkftconfig-kselftest

Regression Analysis: - New regression? Yes - Reproducibility? Yes

Build regression: selftests mm pkey_sighandler_tests.c warning duplicate 'inline' declaration specifier [-Wduplicate-decl-specifier]

Build regression: selftests mm mremap_test.c warning pointer comparison always evaluates to false [-Wtautological-compare]

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

## Build log make[4]: Entering directory '/builds/linux/tools/testing/selftests/mm' /bin/sh ./check_config.sh clang --target=aarch64-linux-gnu -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument --target=aarch64-linux-gnu -fintegrated-as CC cow CC compaction_test CC gup_longterm CC gup_test CC hmm-tests CC hugetlb-madvise CC hugetlb-read-hwpoison CC hugetlb-soft-offline CC hugepage-mmap CC hugepage-mremap CC hugepage-shm CC hugepage-vmemmap CC khugepaged CC madv_populate CC map_fixed_noreplace CC map_hugetlb CC map_populate CC memfd_secret CC migration CC mkdirty CC mlock-random-test CC mlock2-tests CC mrelease_test CC mremap_dontunmap CC mremap_test mremap_test.c:425:31: warning: pointer comparison always evaluates to false [-Wtautological-compare] 425 | if (addr + c.dest_alignment < addr) { | ^ 1 warning generated. CC mseal_test CC on-fault-limit CC pagemap_ioctl CC pfnmap CC thuge-gen CC transhuge-stress CC uffd-stress CC uffd-unit-tests CC uffd-wp-mremap CC split_huge_page_test CC ksm_tests CC ksm_functional_tests CC mdwe_test CC hugetlb_fault_after_madv CC hugetlb_madv_vs_map CC hugetlb_dio CC droppable CC guard-regions CC merge CC protection_keys CC pkey_sighandler_tests pkey_sighandler_tests.c:44:15: warning: duplicate 'inline' declaration specifier [-Wduplicate-decl-specifier] 44 | static inline __always_inline | ^ /usr/lib/gcc-cross/aarch64-linux-gnu/12/../../../../aarch64-linux-gnu/include/sys/cdefs.h:424:26: note: expanded from macro '__always_inline' 424 | # define __always_inline __inline __attribute__ ((__always_inline__)) | ^ 1 warning generated. CC va_high_addr_switch CC virtual_address_range CC write_to_hugetlbfs

Warning: missing Module.symvers, please have the kernel built first. page_frag test will be skipped.

make[4]: Leaving directory '/builds/linux/tools/testing/selftests/mm'

## Source * Kernel version: 6.16.0-rc2 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: 050f8ad7b58d9079455af171ac279c4b9b828c11 * Git describe: next-20250616 * Project details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250616/ * Architectures: arm64, x86_64 * Toolchains: clang nightly * Kconfigs: selftest/mm/config+defconfig+

## Build arm64 * Build log: https://qa-reports.linaro.org/api/testruns/28765515/log_file/ * Build details: https://regressions.linaro.org/lkft/linux-next-master/next-20250616/log-pars... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2ya0viPHafKAe0u89drIv... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2ya0viPHafKAe0u89drIv...

## Steps to reproduce on arm64 - tuxmake --runtime podman --target-arch arm64 --toolchain clang-20 \ --kconfig defconfig \ --kconfig-add https://gitlab.com/Linaro/lkft/kernel-fragments/-/raw/main/netdev.config \ --kconfig-add https://gitlab.com/Linaro/lkft/kernel-fragments/-/raw/main/systemd.config \ --kconfig-add CONFIG_SYN_COOKIES=y \ --kconfig-add CONFIG_SCHEDSTATS=y LLVM=1 LLVM_IAS=1 debugkernel dtbs dtbs-legacy headers kernel kselftest modules

-- Linaro LKFT https://lkft.linaro.org