Clang Build warning detected - include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *' [-Werror,-Wnon-literal-null-conversion]
Following build warning / errors noticed while building x86_64 with clang on Linux next-20221025 tag.
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Build * kernel: 6.1.0-rc1 * git: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next * git branch: master * git commit: 76cf65d1377f733af1e2a55233e3353ffa577f54 * git describe: next-20221024 * test details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20221024
## Test Regressions (compared to next-20221021) * i386, build - clang-12-lkftconfig - clang-13-lkftconfig - clang-14-lkftconfig - clang-nightly-lkftconfig
* x86_64, build - clang-12-lkftconfig - clang-13-lkftconfig - clang-14-lkftconfig - clang-nightly-lkftconfig
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=clang CC=clang In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:20: In file included from include/linux/mm.h:31: include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *' [-Werror,-Wnon-literal-null-conversion] return false; ^~~~~ 1 error generated. make[2]: *** [scripts/Makefile.build:118: arch/x86/kernel/asm-offsets.s] Error 1
-- Linaro LKFT https://lkft.linaro.org
On Mon, Oct 24, 2022 at 9:19 PM Naresh Kamboju naresh.kamboju@linaro.org wrote:
Following build warning / errors noticed while building x86_64 with clang on Linux next-20221025 tag.
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Hi Naresh, Thanks for the report. It looks like AKPM is already aware. https://lore.kernel.org/llvm/20221022163356.f5e08eeefe66fc71845be861@linux-f...
Naresh, for future reports, can you use our newer mailing list llvm@lists.linux.dev rather than our older one (clang-built-linux@googlegroups.com). I haven't actually closed the old one, but the new one is syndicated on lore. https://lore.kernel.org/llvm/
## Build
- kernel: 6.1.0-rc1
- git: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
- git branch: master
- git commit: 76cf65d1377f733af1e2a55233e3353ffa577f54
- git describe: next-20221024
- test details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20221024
## Test Regressions (compared to next-20221021)
i386, build
- clang-12-lkftconfig
- clang-13-lkftconfig
- clang-14-lkftconfig
- clang-nightly-lkftconfig
x86_64, build
- clang-12-lkftconfig
- clang-13-lkftconfig
- clang-14-lkftconfig
- clang-nightly-lkftconfig
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=clang CC=clang In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:20: In file included from include/linux/mm.h:31: include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *' [-Werror,-Wnon-literal-null-conversion] return false; ^~~~~ 1 error generated. make[2]: *** [scripts/Makefile.build:118: arch/x86/kernel/asm-offsets.s] Error 1
-- Linaro LKFT https://lkft.linaro.org
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Naresh Kamboju -
Nick Desaulniers