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    Subject[PATCHv2, RFC 10/30] thp, mm: locking tail page is a bug
    Date
    From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    mm/filemap.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/mm/filemap.c b/mm/filemap.c
    index 0ff3403..38fdc92 100644
    --- a/mm/filemap.c
    +++ b/mm/filemap.c
    @@ -669,6 +669,7 @@ void __lock_page(struct page *page)
    {
    DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);

    + VM_BUG_ON(PageTail(page));
    __wait_on_bit_lock(page_waitqueue(page), &wait, sleep_on_page,
    TASK_UNINTERRUPTIBLE);
    }
    @@ -678,6 +679,7 @@ int __lock_page_killable(struct page *page)
    {
    DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);

    + VM_BUG_ON(PageTail(page));
    return __wait_on_bit_lock(page_waitqueue(page), &wait,
    sleep_on_page_killable, TASK_KILLABLE);
    }
    --
    1.7.10.4


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