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    SubjectRe: [PATCHv2, RFC 11/30] thp, mm: handle tail pages in page_cache_get_speculative()
    Hi Kirill,
    On 03/15/2013 01:50 AM, Kirill A. Shutemov wrote:
    > 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)

    What's the different between page_cache_get_speculative and page_cache_get?

    > {
    > 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;
    > }



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