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Message-Id: <1445478147-29782-1-git-send-email-mike.kravetz@oracle.com> Date: Wed, 21 Oct 2015 18:42:27 -0700 From: Mike Kravetz <mike.kravetz@...cle.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Hugh Dickins <hughd@...gle.com>, Davidlohr Bueso <dave@...olabs.net>, Andrew Morton <akpm@...ux-foundation.org>, Mike Kravetz <mike.kravetz@...cle.com> Subject: [PATCH] mm/hugetlb: i_mmap_lock_write before unmapping in remove_inode_hugepages 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. Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com> --- fs/hugetlbfs/inode.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index f25b72f..0f3999d 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -428,9 +428,11 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart, * until we finish removing the page. */ if (page_mapped(page)) { + i_mmap_lock_write(mapping); hugetlb_vmdelete_list(&mapping->i_mmap, next * pages_per_huge_page(h), (next + 1) * pages_per_huge_page(h)); + i_mmap_unlock_write(mapping); } lock_page(page); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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