linux-kernel - [next] x86: fs/hugetlbfs/inode.c:673:16: error: variable 'm_index' is uninitialized when used here [-Werror,-Wuninitialized]

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Date:   Thu, 25 Aug 2022 16:13:30 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        regressions@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Cc:     Muchun Song <songmuchun@...edance.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        David Hildenbrand <david@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        James Houghton <jthoughton@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Michal Hocko <mhocko@...e.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Xu <peterx@...hat.com>,
        Prakash Sangappa <prakash.sangappa@...cle.com>
Subject: [next] x86: fs/hugetlbfs/inode.c:673:16: error: variable 'm_index' is
 uninitialized when used here [-Werror,-Wuninitialized]

The x86_64 and i386 clang builds failed due to these warnings / errors
on Linux next-20220825.

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

fs/hugetlbfs/inode.c:673:16: error: variable 'm_index' is
uninitialized when used here [-Werror,-Wuninitialized]
                                                m_start, m_index, truncate_op);
                                                         ^~~~~~~
fs/hugetlbfs/inode.c:651:26: note: initialize the variable 'm_index'
to silence this warning
        pgoff_t m_start, m_index;
                                ^
                                 = 0
1 error generated.
make[3]: *** [scripts/Makefile.build:250: fs/hugetlbfs/inode.o] Error 1
make[3]: Target '__build' not remade because of errors.
make[2]: *** [scripts/Makefile.build:525: fs/hugetlbfs] Error 2

Build link: https://builds.tuxbuild.com/2Dpvef6uVvzHMztbfQRmxJfPXZT/

Steps to reproduce:
-------------------
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake

tuxmake --runtime podman --target-arch x86_64 --toolchain clang-14
--kconfig https://builds.tuxbuild.com/2Dpvef6uVvzHMztbfQRmxJfPXZT/config
LLVM=1 LLVM_IAS=1

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