linux-kernel - Re: [PATCH] mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING

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Message-ID: <CANn89iKP5D2CvVg28-FmPsJ7U9uLuBy-UtunS=arhKSwf0H=gg@mail.gmail.com>
Date:   Fri, 1 Oct 2021 14:52:35 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        syzbot <syzkaller@...glegroups.com>,
        "Huang, Ying" <ying.huang@...el.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING
 | MPOL_LOCAL in mbind()

On Fri, Oct 1, 2021 at 1:25 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Eric,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on hnaz-mm/master]
>
> url:    https://github.com/0day-ci/linux/commits/Eric-Dumazet/mm-mempolicy-do-not-allow-illegal-MPOL_F_NUMA_BALANCING-MPOL_LOCAL-in-mbind/20211002-015054
> base:   https://github.com/hnaz/linux-mm master
> config: ia64-defconfig (attached as .config)
> compiler: ia64-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/0day-ci/linux/commit/fe87354835a4bf5cad6d885f0ba558c767fee6f1
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Eric-Dumazet/mm-mempolicy-do-not-allow-illegal-MPOL_F_NUMA_BALANCING-MPOL_LOCAL-in-mbind/20211002-015054
>         git checkout fe87354835a4bf5cad6d885f0ba558c767fee6f1
>         # save the attached .config to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>    mm/mempolicy.c: In function 'sanitize_mpol_flags':
> >> mm/mempolicy.c:1452:26: warning: comparison between pointer and integer
>     1452 |                 if (mode != MPOL_BIND)
>          |                          ^~

Oh well, last minute changes, and indeed my compiler warned me while I
was away :/

mm/mempolicy.c:1452:12: warning: comparison between pointer and
integer ('int *' and 'int') [-Wpointer-integer-compare]
                if (mode != MPOL_BIND)
                    ~~~~ ^  ~~~~~~~~~

I am sending a v2, thanks.

>
>
> vim +1452 mm/mempolicy.c
>
>   1440
>   1441  /* Basic parameter sanity check used by both mbind() and set_mempolicy() */
>   1442  static inline int sanitize_mpol_flags(int *mode, unsigned short *flags)
>   1443  {
>   1444          *flags = *mode & MPOL_MODE_FLAGS;
>   1445          *mode &= ~MPOL_MODE_FLAGS;
>   1446
>   1447          if ((unsigned int)(*mode) >=  MPOL_MAX)
>   1448                  return -EINVAL;
>   1449          if ((*flags & MPOL_F_STATIC_NODES) && (*flags & MPOL_F_RELATIVE_NODES))
>   1450                  return -EINVAL;
>   1451          if (*flags & MPOL_F_NUMA_BALANCING) {
> > 1452                  if (mode != MPOL_BIND)
>   1453                          return -EINVAL;
>   1454                  *flags |= (MPOL_F_MOF | MPOL_F_MORON);
>   1455          }
>   1456          return 0;
>   1457  }
>   1458
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org