Regressions found on arm, arm64 and x86_64 building warnings with clang-20 and clang-nightly started from Linux next-20250603

Regressions found on arm, arm64 and x86_64 - selftests/filesystem

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

First seen on the next-20250603 Good: next-20250530 Bad: next-20250603

Test regression: arm arm64 x86_64 clang warning null passed to a callee that requires a non-null argument [-Wnonnull]

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

## Build warnings make[4]: Entering directory '/builds/linux/tools/testing/selftests/filesystems' CC devpts_pts CC file_stressor CC anon_inode_test anon_inode_test.c:45:37: warning: null passed to a callee that requires a non-null argument [-Wnonnull] 45 | ASSERT_LT(execveat(fd_context, "", NULL, NULL, AT_EMPTY_PATH), 0); | ^~~~

## Source * Kernel version: 6.15.0-next-20250605 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: a0bea9e39035edc56a994630e6048c8a191a99d8 * Toolchain: Debian clang version 21.0.0 (++20250529012636+c474f8f2404d-1~exp1~20250529132821.1479)

## Build * Test log: https://qa-reports.linaro.org/api/testruns/28651387/log_file/ * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2xzM4wMl8SvuLKE3mw3cs... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2xzM4wMl8SvuLKE3mw3cs...

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