block/mq-deadline.c:274:12: error: 'dd_queued' defined but not used [-Werror=unused-function]

Following build warnings/ errors noticed while building linux mainline
master branch
with gcc-11 for arm architecture with clps711x_defconfig config file.

block/mq-deadline.c:274:12: error: 'dd_queued' defined but not used
[-Werror=unused-function]
  274 | static u32 dd_queued(struct deadline_data *dd, enum dd_prio prio)
      |            ^~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [/builds/linux/scripts/Makefile.build:277:
block/mq-deadline.o] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [/builds/linux/Makefile:1872: block] Error 2
make[1]: Target '__all' not remade because of errors.
make: *** [Makefile:219: __sub-make] Error 2
make: Target '__all' not remade because of errors.

Build config:
https://builds.tuxbuild.com/1xjZuKPY0IygLQHFkTFMY9TPQh4/config

Reported-by: Linux Kernel Functional Testing <redacted>

meta data:
-----------
    git_describe: v5.14-9687-g27151f177827
    git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
    git_sha: 27151f177827d478508e756c7657273261aaf8a9
    git_short_log: 27151f177827 (\Merge tag
'perf-tools-for-v5.15-2021-09-04' of
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux\)
    kconfig: [
        clps711x_defconfig
    ]
    kernel_version: 5.14.0
    target_arch: arm
    toolchain: gcc-11

steps to reproduce:
https://builds.tuxbuild.com/1xjZuKPY0IygLQHFkTFMY9TPQh4/tuxmake_reproducer.sh

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