[PATCH 2/4] mm/thp: clean up lru_add_page_tail

[Alex Shi]

Since the first parameter is only used by head page, it's better to make
it explicit.

Signed-off-by: Alex Shi <alex....@linux.alibaba.com>
Reviewed-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: Matthew Wilcox <wi...@infradead.org>
Cc: Hugh Dickins <hu...@google.com>
Cc: linux...@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/huge_memory.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index bc905e7079bf..8cecd39bd8b7 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2315,19 +2315,19 @@ static void remap_page(struct page *page)
        }
 }
 
-static void lru_add_page_tail(struct page *page, struct page *page_tail,
+static void lru_add_page_tail(struct page *head, struct page *page_tail,
                                struct lruvec *lruvec, struct list_head *list)
 {
-       VM_BUG_ON_PAGE(!PageHead(page), page);
-       VM_BUG_ON_PAGE(PageCompound(page_tail), page);
-       VM_BUG_ON_PAGE(PageLRU(page_tail), page);
+       VM_BUG_ON_PAGE(!PageHead(head), head);
+       VM_BUG_ON_PAGE(PageCompound(page_tail), head);
+       VM_BUG_ON_PAGE(PageLRU(page_tail), head);
        lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock);
 
        if (!list)
                SetPageLRU(page_tail);
 
-       if (likely(PageLRU(page)))
-               list_add_tail(&page_tail->lru, &page->lru);
+       if (likely(PageLRU(head)))
+               list_add_tail(&page_tail->lru, &head->lru);
        else if (list) {
                /* page reclaim is reclaiming a huge page */
                get_page(page_tail);
-- 
1.8.3.1