linux-kernel - Re: [PATCH v8 15/23] mm/hugetlb: Handle pte markers in page faults

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Date:   Wed, 6 Apr 2022 11:02:12 -0400
From:   Peter Xu <peterx@...hat.com>
To:     kernel test robot <lkp@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kbuild-all@...ts.01.org, Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH v8 15/23] mm/hugetlb: Handle pte markers in page faults

On Wed, Apr 06, 2022 at 09:37:00PM +0800, kernel test robot wrote:
> Hi Peter,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on hnaz-mm/master]
> [cannot apply to arnd-asm-generic/master linus/master linux/master v5.18-rc1 next-20220406]
> [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/intel-lab-lkp/linux/commits/Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20220405-100136
> base:   https://github.com/hnaz/linux-mm master
> config: s390-randconfig-r044-20220406 (https://download.01.org/0day-ci/archive/20220406/202204062154.2txNJyaf-lkp@intel.com/config)
> compiler: s390-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/intel-lab-lkp/linux/commit/e7e7aaec811e2817cd169f0cc1d8f81bdf1f05c3
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20220405-100136
>         git checkout e7e7aaec811e2817cd169f0cc1d8f81bdf1f05c3
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    mm/hugetlb.c: In function 'hugetlb_fault':
> >> mm/hugetlb.c:5678:13: error: implicit declaration of function 'huge_pte_none_mostly'; did you mean 'pte_none_mostly'? [-Werror=implicit-function-declaration]
>     5678 |         if (huge_pte_none_mostly(entry)) {
>          |             ^~~~~~~~~~~~~~~~~~~~
>          |             pte_none_mostly
>    cc1: some warnings being treated as errors

Ah, the s390 stub was forgotten again, sorry.  I hope someday s390 will
start to include asm-generic/hugetlb.h like all the rest archs, because
that's really from the gut feeling of how it should happen.. or the dir
should be renamed to asm-generic-without-s390/. :(

An expected fix patch attached (to be squashed into patch "mm: Introduce
PTE_MARKER swap entry").

Thanks,

-- 
Peter Xu

View attachment "0001-fixup-mm-Introduce-PTE_MARKER-swap-entry.patch" of type "text/plain" (790 bytes)