linux-kernel - powerpc: pervasive.c:: error: unannotated fall-through between switch labels

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Date:   Wed, 17 Nov 2021 18:23:20 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        lkft-triage@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Subject: powerpc: pervasive.c:: error: unannotated fall-through between switch labels

Regression found on ppc clang-nightly build.
Following build warnings / errors reported on linux next 20211117.

metadata:
    git_describe: next-20211117
    git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
    git_short_log: fd96a4057bd0 (\"Add linux-next specific files for 20211117\")
    target_arch: ppc
    toolchain: clang-nightly

build error :
--------------
<stdin>:1559:2: warning: syscall futex_waitv not implemented [-W#warnings]
#warning syscall futex_waitv not implemented
 ^
1 warning generated.
arch/powerpc/platforms/cell/pervasive.c:81:2: error: unannotated
fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
        case SRR1_WAKEEE:
        ^
arch/powerpc/platforms/cell/pervasive.c:81:2: note: insert 'break;' to
avoid fall-through
        case SRR1_WAKEEE:
        ^
        break;
1 error generated.


Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

build link:
-----------
https://builds.tuxbuild.com/211sfsuxt3flikHFzRts8cFUwqe/build.log

build config:
-------------
https://builds.tuxbuild.com/211sfsuxt3flikHFzRts8cFUwqe/config

# To install tuxmake on your system globally
# sudo pip3 install -U tuxmake
tuxmake --runtime podman --target-arch powerpc --toolchain
clang-nightly --kconfig defconfig LLVM_IAS=0

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