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    Subject[PATCHv2, RFC 11/30] thp, mm: handle tail pages in page_cache_get_speculative()
    Date
    From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

    For tail page we call __get_page_tail(). It has the same semantics, but
    for tail page.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    include/linux/pagemap.h | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
    index 3521b0d..408c4e3 100644
    --- a/include/linux/pagemap.h
    +++ b/include/linux/pagemap.h
    @@ -159,6 +159,9 @@ static inline int page_cache_get_speculative(struct page *page)
    {
    VM_BUG_ON(in_interrupt());

    + if (unlikely(PageTail(page)))
    + return __get_page_tail(page);
    +
    #ifdef CONFIG_TINY_RCU
    # ifdef CONFIG_PREEMPT_COUNT
    VM_BUG_ON(!in_atomic());
    @@ -185,7 +188,6 @@ static inline int page_cache_get_speculative(struct page *page)
    return 0;
    }
    #endif
    - VM_BUG_ON(PageTail(page));

    return 1;
    }
    --
    1.7.10.4


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