The following build warnings / errors are noticed with arc, arm, arm64 defconfig with clang-20 and gcc-12 toolchains.

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

Build regression: next-20250821 tinyconfig kernel panic.c error implicit declaration of function 'panic_print_deprecated'; did you mean 'panic_print_set'? [-Werror=implicit-function-declaration]

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

* arc, build - gcc-9-tinyconfig

* arm, build - clang-20-tinyconfig - clang-nightly-tinyconfig - gcc-13-tinyconfig - gcc-8-tinyconfig

* arm64, build - clang-20-tinyconfig - clang-nightly-tinyconfig - gcc-13-tinyconfig - gcc-8-tinyconfig

* parisc, build - gcc-11-tinyconfig

* powerpc, build - clang-20-tinyconfig - clang-nightly-tinyconfig - gcc-13-tinyconfig - gcc-8-tinyconfig

## Build log kernel/panic.c: In function 'panic_print_set': kernel/panic.c:954:9: error: implicit declaration of function 'panic_print_deprecated'; did you mean 'panic_print_set'? [-Werror=implicit-function-declaration] 954 | panic_print_deprecated(); | ^~~~~~~~~~~~~~~~~~~~~~ | panic_print_set cc1: some warnings being treated as errors

## Source * Kernel version: 6.17.0-rc2 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git describe: next-20250821 * Git commit: 7fa4d8dc380fbd81a9d702a855c50690c9c6442c * Architectures: arc arm arm64 * Toolchains: clang-20 gcc-12 * Kconfigs: defconfig

## Build * Build log: https://qa-reports.linaro.org/api/testruns/29616870/log_file/ * Build details: https://regressions.linaro.org/lkft/linux-next-master/next-20250821/build/cl... * Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/31aRY2vQ0c... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/31aRY2vQ0cMol9wA63TKk... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/31aRY2vQ0cMol9wA63TKk...

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