linux-kernel - 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]

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Date:   Tue, 25 Oct 2022 09:49:24 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     clang-built-linux <clang-built-linux@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: 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@...aro.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