linux-kernel - Re: [PATCH 3/3] hugetlbfs: replace hugetlb_vma_lock with invalidate

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Date:   Mon, 25 Sep 2023 15:22:29 -0400
From:   Rik van Riel <riel@...riel.com>
To:     kernel test robot <lkp@...el.com>, linux-kernel@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev, kernel-team@...a.com,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        muchun.song@...ux.dev, mike.kravetz@...cle.com, leit@...a.com,
        willy@...radead.org
Subject: Re: [PATCH 3/3] hugetlbfs: replace hugetlb_vma_lock with
 invalidate_lock

On Mon, 2023-09-25 at 10:04 +0800, kernel test robot wrote:
> Hi,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on akpm-mm/mm-everything]
> [also build test ERROR on linus/master v6.6-rc3 next-20230921]
> [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]

OK, so I have a fix for patch 3/3 that gets rid of the
compile error, but the libhugetlbfs test cases show that
patch 3/3 opens up a condition where resv_hugepages 
underflows.

I have not figured out the cause of that yet, but
patches 1 & 2 seem to survive all tests fine.

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