ring-buffer: only enable ring_buffer_swap_cpu when needed

[safe/jmp/linux-2.6] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index 794c862..0672ff8 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -247,6 +247,7 @@ again:
        if (err < 0)
                return err;
 
+       page = compound_head(page);
        lock_page(page);
        if (!page->mapping) {
                unlock_page(page);