linux-kernel - Re: [PATCH] mempolicy: alloc_pages_mpol() for NUMA policy without vma: fix

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Message-ID: <38fa4314-3fc7-4e16-fc9d-2773d36a31b1@google.com>
Date:   Tue, 24 Oct 2023 08:56:20 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     kernel test robot <lkp@...el.com>
cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        oe-kbuild-all@...ts.linux.dev,
        Linux Memory Management List <linux-mm@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        domenico cerasuolo <mimmocerasuolo@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Christoph Lameter <cl@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Vishal Moola <vishal.moola@...mil.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Nhat Pham <nphamcs@...il.com>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mempolicy: alloc_pages_mpol() for NUMA policy without
 vma: fix

On Tue, 24 Oct 2023, kernel test robot wrote:

> Hi Hugh,
> 
> kernel test robot noticed the following build warnings:
> 
> 
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/UPDATE-20231024-144517/Hugh-Dickins/hugetlbfs-drop-shared-NUMA-mempolicy-pretence/20231003-173301
> base:   the 10th patch of https://lore.kernel.org/r/74e34633-6060-f5e3-aee-7040d43f2e93%40google.com
> patch link:    https://lore.kernel.org/r/00dc4f56-e623-7c85-29ea-4211e93063f6%40google.com
> patch subject: [PATCH] mempolicy: alloc_pages_mpol() for NUMA policy without vma: fix
> config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20231024/202310241551.uY40myKo-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231024/202310241551.uY40myKo-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202310241551.uY40myKo-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from mm/zswap.c:41:
>    mm/internal.h: In function 'shrinker_debugfs_name_alloc':
>    mm/internal.h:1232:9: warning: function 'shrinker_debugfs_name_alloc' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
>     1232 |         shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap);
>          |         ^~~~~~~~
>    mm/zswap.c: In function 'zswap_writeback_entry':
>    mm/zswap.c:1322:16: error: implicit declaration of function 'get_task_policy'; did you mean 'get_vma_policy'? [-Werror=implicit-function-declaration]
>     1322 |         mpol = get_task_policy(current);
>          |                ^~~~~~~~~~~~~~~
>          |                get_vma_policy
> >> mm/zswap.c:1322:14: warning: assignment to 'struct mempolicy *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>     1322 |         mpol = get_task_policy(current);
>          |              ^
>    cc1: some warnings being treated as errors

Gaah, thanks for that, I never built it without CONFIG_NUMA=y:
v2 patch with a get_task_policy() without CONFIG_NUMA coming up,
built this time.

Hugh