Re: [RFC PATCH v2 3/3] mm/mempolicy: wire up syscall set_mempolicy_home_node

[Nick Desaulniers <ndesaulniers@google.com>]

On Wed, Oct 20, 2021 at 11:01 PM Aneesh Kumar K.V
<aneesh.kumar@linux.ibm.com> wrote:
>
> On 10/21/21 00:54, kernel test robot wrote:
> > Hi "Aneesh,
> >
> > [FYI, it's a private test report for your RFC patch.]
> > [auto build test WARNING on arm64/for-next/core]
> > [also build test WARNING on linus/master v5.15-rc6]
> > [cannot apply to hnaz-mm/master tip/x86/asm next-20211020]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch]
> >
> > url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/mm-mempolicy-use-policy_node-helper-with-MPOL_PREFERRED_MANY/20211020-172721
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
> > config: arm64-randconfig-r033-20211019 (attached as .config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9660563950aaed54020bfdf0be07e7096a9553e4)
> > reproduce (this is a W=1 build):

^ W=1

> >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # install arm64 cross compiling tool for clang build
> >          # apt-get install binutils-aarch64-linux-gnu
> >          # https://github.com/0day-ci/linux/commit/10f30e8157782f17ae682c2bbca95c226af3612a
> >          git remote add linux-review https://github.com/0day-ci/linux
> >          git fetch --no-tags linux-review Aneesh-Kumar-K-V/mm-mempolicy-use-policy_node-helper-with-MPOL_PREFERRED_MANY/20211020-172721
> >          git checkout 10f30e8157782f17ae682c2bbca95c226af3612a
> >          # save the attached .config to linux build tree
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> >             asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs)   \
> >                                    ^
> >     <scratch space>:60:1: note: expanded from here
> >     __arm64_sys_process_madvise
> >     ^
> >     kernel/sys_ni.c:291:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> >     arch/arm64/include/asm/syscall_wrapper.h:76:13: note: expanded from macro 'COND_SYSCALL'
> >             asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs)   \
> >                        ^
>
> Is this clang specific? I am not able to recreate this with gcc 10 cross
> compiling.

Did you build with `make ... W=1`? I suspect GCC will print those
additional warnings, too, at W=1.
-- 
Thanks,
~Nick Desaulniers