linux-kernel - Re: [PATCH] mm/hugetlb: i_mmap_lock_write before unmapping in remove_inode

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Date:	Fri, 23 Oct 2015 06:45:53 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm/hugetlb: i_mmap_lock_write before unmapping in
 remove_inode_hugepages

On Wed, 21 Oct 2015, Mike Kravetz wrote:

>Code was added to remove_inode_hugepages that will unmap a page if
>it is mapped.  i_mmap_lock_write() must be taken during the call
>to hugetlb_vmdelete_list().  This is to prevent mappings(vmas) from
>being added or deleted while the list of vmas is being examined.
                                   ^^^^ interval-tree.
>
>Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>

Reviewed-by: Davidlohr Bueso <dbueso@...e.de>
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