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Date: Wed, 26 Oct 2022 01:43:48 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: linux-mm <linux-mm@...ck.org>,
open list <linux-kernel@...r.kernel.org>,
lkft-triage@...ts.linaro.org, llvm@...ts.linux.dev
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Gautam Menghani <gautammenghani201@...il.com>,
David Hildenbrand <david@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Vlastimil Babka <vbabka@...e.cz>,
Yang Shi <shy828301@...il.com>,
"Zach O'Keefe" <zokeefe@...gle.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: clang: mm/khugepaged.c:1729:7: error: variable 'index' is used
uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
Following build warning / errors noticed while building x86_64 with clang
on Linux next-20221025 tag.
Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
## Build
* kernel: 6.1.0-rc2
* git: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
* git branch: master
* git commit: 89bf6e28373beef9577fa71f996a5f73a569617c
* git describe: next-20221025
* test details:
https://qa-reports.linaro.org/lkft/linux-next-master-sanity/build/next-20221025
## Test Regressions (compared to next-20221024)
Regressions found on x86_64:
- clang-nightly-lkftconfig
- clang-12-lkftconfig
- clang-14-lkftconfig
- clang-13-lkftconfig
- clang-14-lkftconfig-kcsan
make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1
ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'HOSTCC=sccache clang'
'CC=sccache clang'
mm/khugepaged.c:1729:7: error: variable 'index' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!xas_nomem(&xas, GFP_KERNEL)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:2063:47: note: uninitialized use occurs here
trace_mm_khugepaged_collapse_file(mm, hpage, index, is_shmem,
^~~~~
mm/khugepaged.c:1729:3: note: remove the 'if' if its condition is always false
if (!xas_nomem(&xas, GFP_KERNEL)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:1716:6: error: variable 'index' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (result != SCAN_SUCCEED)
^~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:2063:47: note: uninitialized use occurs here
trace_mm_khugepaged_collapse_file(mm, hpage, index, is_shmem,
^~~~~
mm/khugepaged.c:1716:2: note: remove the 'if' if its condition is always false
if (result != SCAN_SUCCEED)
^~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:1705:15: note: initialize the variable 'index' to
silence this warning
pgoff_t index, end = start + HPAGE_PMD_NR;
^
= 0
mm/khugepaged.c:1729:7: error: variable 'nr' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!xas_nomem(&xas, GFP_KERNEL)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:2064:15: note: uninitialized use occurs here
addr, file, nr, result);
^~
mm/khugepaged.c:1729:3: note: remove the 'if' if its condition is always false
if (!xas_nomem(&xas, GFP_KERNEL)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:1716:6: error: variable 'nr' is used uninitialized
whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (result != SCAN_SUCCEED)
^~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:2064:15: note: uninitialized use occurs here
addr, file, nr, result);
^~
mm/khugepaged.c:1716:2: note: remove the 'if' if its condition is always false
if (result != SCAN_SUCCEED)
^~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/khugepaged.c:1710:8: note: initialize the variable 'nr' to silence
this warning
int nr;
^
= 0
4 errors generated.
make[3]: *** [scripts/Makefile.build:250: 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-14
--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
tuxmake --runtime podman --target-arch x86_64 --toolchain clang-14
--kconfig https://builds.tuxbuild.com/2Gc0JDbUOIN0veL39dqIt03qgEi/config
LLVM=1 LLVM_IAS=1
Build link,
- https://builds.tuxbuild.com/2Gc0JDbUOIN0veL39dqIt03qgEi/
--
Linaro LKFT
https://lkft.linaro.org
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