[RFC 2/4] mm: introduce __swapcache_free

[Minchan Kim <minchan@kernel.org>]

The __swapcache_free is almost same with swapcache_free
but only difference is that caller should pass stable swap_info_struct.

This function will be used by next patchsets.

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 mm/swapfile.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 2966978..33ebdd5 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -634,20 +634,26 @@ void swap_free(swp_entry_t entry)
 	}
 }
 
+
+void __swapcache_free(struct swap_info_struct *p,
+			swp_entry_t entry, struct page *page)
+{
+	unsigned char count;
+	count = swap_entry_free(p, entry, SWAP_HAS_CACHE);
+	mem_cgroup_uncharge_swapcache(page, entry, count != 0);
+}
+
 /*
  * Called after dropping swapcache to decrease refcnt to swap entries.
  */
 void swapcache_free(swp_entry_t entry, struct page *page)
 {
 	struct swap_info_struct *p;
-	unsigned char count;
 
 	p = swap_info_get(entry);
 	if (p) {
 		spin_lock(&p->lock);
-		count = swap_entry_free(p, entry, SWAP_HAS_CACHE);
-		if (page)
-			mem_cgroup_uncharge_swapcache(page, entry, count != 0);
+		__swapcache_free(p, entry, page);
 		spin_unlock(&p->lock);
 	}
 }
-- 
1.8.2.1

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