linux-kernel - next: x86: clang: mm/khugepaged.c:1428:45: error: variable 'pmd' is uninitialized when used here

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Date:   Thu, 24 Nov 2022 21:07:48 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, llvm@...ts.linux.dev,
        regressions@...ts.linux.dev, lkft-triage@...ts.linaro.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>, vishal.moola@...il.com,
        Matthew Wilcox <willy@...radead.org>
Subject: next: x86: clang: mm/khugepaged.c:1428:45: error: variable 'pmd' is
 uninitialized when used here

LKFT CI system noticed clang-15 build failures on x86_64 and i386.

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

make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1
ARCH=x86_64 SRCARCH=x86 CROSS_COMPILE=x86_64-linux-gnu-
'HOSTCC=sccache clang' 'CC=sccache clang'
mm/khugepaged.c:1428:45: error: variable 'pmd' is uninitialized when
used here [-Werror,-Wuninitialized]
        page_table_check_pte_clear_range(mm, addr, pmd);
                                                   ^~~
mm/khugepaged.c:1415:2: note: variable 'pmd' is declared here
        pmd_t pmd;
        ^
1 error generated.
make[3]: *** [scripts/Makefile.build:252: mm/khugepaged.o] Error 1

steps to reproduce:
------------------
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake
#
# See https://docs.tuxmake.org/ for complete documentation.
# Original tuxmake command with fragments listed below.
# tuxmake --runtime podman --target-arch x86_64 --toolchain clang-15
--kconfig defconfig --kconfig-add
https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/lkft.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/lkft-crypto.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/distro-overrides.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/systemd.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/virtio.config
--kconfig-add CONFIG_IGB=y --kconfig-add
CONFIG_UNWINDER_FRAME_POINTER=y LLVM=1 LLVM_IAS=1


Build results compare:
https://qa-reports.linaro.org/lkft/linux-next-master-sanity/build/next-20221124/testrun/13170041/suite/build/test/clang-lkftconfig/history/

Build log link,
https://builds.tuxbuild.com/2Hz2wymTKCJRrwkDTV5zeM4SkJ0/

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