[PATCH 10/10] zsmalloc: implement zs_zpool_shrink() with zs_shrink()

[Dan Streetman]

Implement the zs_zpool_shrink() function, which previously just returned
EINVAL, by calling the zs_shrink() function to shrink the zs_pool by one
zspage.  The zs_shrink() function is called in a loop until the requested
number of pages have been reclaimed, or an error occurs.

Signed-off-by: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
---
 mm/zsmalloc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index f769c21..4937b2b 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -292,7 +292,20 @@ static void zs_zpool_free(void *pool, unsigned long handle)
 static int zs_zpool_shrink(void *pool, unsigned int pages,
 			unsigned int *reclaimed)
 {
-	return -EINVAL;
+	int total = 0, ret = 0;
+
+	while (total < pages) {
+		ret = zs_shrink(pool);
+		WARN_ON(!ret);
+		if (ret <= 0)
+			break;
+		total += ret;
+		ret = 0;
+	}
+
+	if (reclaimed)
+		*reclaimed = total;
+	return ret;
 }
 
 static void *zs_zpool_map(void *pool, unsigned long handle,
-- 
1.8.3.1

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