From 1c1c53d43b387d02174911ecb42ce846577b0ea0 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@google.com>
Date: Thu, 12 Jan 2012 17:20:04 -0800
Subject: [PATCH] mm: remove del_page_from_lru, add page_off_lru
del_page_from_lru() repeats del_page_from_lru_list(), also working out
which LRU the page was on, clearing the relevant bits. Decouple those
functions: remove del_page_from_lru() and add page_off_lru().
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/mm_inline.h | 15 +++++++++------
mm/swap.c | 4 ++--
2 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 8f84d2e53d0f..227fd3e9a9c9 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -54,8 +54,14 @@ static inline enum lru_list page_lru_base_type(struct page *page)
return LRU_INACTIVE_ANON;
}
-static inline void
-del_page_from_lru(struct zone *zone, struct page *page)
+/**
+ * page_off_lru - which LRU list was page on? clearing its lru flags.
+ * @page: the page to test
+ *
+ * Returns the LRU list a page was on, as an index into the array of LRU
+ * lists; and clears its Unevictable or Active flags, ready for freeing.
+ */
+static inline enum lru_list page_off_lru(struct page *page)
{
enum lru_list lru;
@@ -69,9 +75,7 @@ del_page_from_lru(struct zone *zone, struct page *page)
lru += LRU_ACTIVE;
}
}
- mem_cgroup_lru_del_list(page, lru);
- list_del(&page->lru);
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, -hpage_nr_pages(page));
+ return lru;
}
/**
@@ -92,7 +96,6 @@ static inline enum lru_list page_lru(struct page *page)
if (PageActive(page))
lru += LRU_ACTIVE;
}
-
return lru;
}
diff --git a/mm/swap.c b/mm/swap.c
index 0d1b24b3fa87..b0f529b38979 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -53,7 +53,7 @@ static void __page_cache_release(struct page *page)
spin_lock_irqsave(&zone->lru_lock, flags);
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru(zone, page);
+ del_page_from_lru_list(zone, page, page_off_lru(page));
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
@@ -617,7 +617,7 @@ void release_pages(struct page **pages, int nr, int cold)
}
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru(zone, page);
+ del_page_from_lru_list(zone, page, page_off_lru(page));
}
list_add(&page->lru, &pages_to_free);