linux-kernel - Re: [PATCH 2/3] hugetlb: take hugetlb vma_lock when clearing vma

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Date:   Wed, 5 Oct 2022 14:58:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Muchun Song <songmuchun@...edance.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Michal Hocko <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        James Houghton <jthoughton@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Ray Fucillo <Ray.Fucillo@...ersystems.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 2/3] hugetlb: take hugetlb vma_lock when clearing
 vma_lock->vma pointer

Hi Mike,

I love your patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on next-20221004]
[cannot apply to linus/master v6.0]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mike-Kravetz/hugetlb-fixes-for-new-vma-lock-series/20221005-091913
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: i386-randconfig-a003-20221003
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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/49523e6ee01b312c4eebea201b3ac31836fb1227
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Mike-Kravetz/hugetlb-fixes-for-new-vma-lock-series/20221005-091913
        git checkout 49523e6ee01b312c4eebea201b3ac31836fb1227
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> mm/hugetlb.c:6945:6: warning: no previous prototype for function '__hugetlb_vma_unlock_write_put' [-Wmissing-prototypes]
   void __hugetlb_vma_unlock_write_put(struct hugetlb_vma_lock *vma_lock)
        ^
   mm/hugetlb.c:6945:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __hugetlb_vma_unlock_write_put(struct hugetlb_vma_lock *vma_lock)
   ^
   static 
   1 warning generated.


vim +/__hugetlb_vma_unlock_write_put +6945 mm/hugetlb.c

  6944	
> 6945	void __hugetlb_vma_unlock_write_put(struct hugetlb_vma_lock *vma_lock)
  6946	{
  6947		struct vm_area_struct *vma = vma_lock->vma;
  6948	
  6949		/*
  6950		 * vma_lock structure may or not be released as a result of put,
  6951		 * it certainly will no longer be attached to vma so clear pointer.
  6952		 * Semaphore synchronizes access to vma_lock->vma field.
  6953		 */
  6954		vma_lock->vma = NULL;
  6955		vma->vm_private_data = NULL;
  6956		up_write(&vma_lock->rw_sema);
  6957		kref_put(&vma_lock->refs, hugetlb_vma_lock_release);
  6958	}
  6959	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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