[RFC PATCH v3 3/6] workignset: simplify the initilization code

[Kairui Song <ryncsn@gmail.com>]

From: Kairui Song <kasong@tencent.com>

Use the new introduced EVICTION_BITS to replace timestamp_bits, compiler
should be able to optimize out the previous variable but this should
make the code more clear and unified.

Signed-off-by: Kairui Song <kasong@tencent.com>
---
 mm/workingset.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/workingset.c b/mm/workingset.c
index b0704cbfc667..278c3b9eb549 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -772,7 +772,6 @@ static struct lock_class_key shadow_nodes_key;
 
 static int __init workingset_init(void)
 {
-	unsigned int timestamp_bits;
 	unsigned int max_order;
 	int ret;
 
@@ -784,12 +783,11 @@ static int __init workingset_init(void)
 	 * some more pages at runtime, so keep working with up to
 	 * double the initial memory by using totalram_pages as-is.
 	 */
-	timestamp_bits = BITS_PER_LONG - EVICTION_SHIFT;
 	max_order = fls_long(totalram_pages() - 1);
-	if (max_order > timestamp_bits)
-		bucket_order = max_order - timestamp_bits;
+	if (max_order > EVICTION_BITS)
+		bucket_order = max_order - EVICTION_BITS;
 	pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
-	       timestamp_bits, max_order, bucket_order);
+		EVICTION_BITS, max_order, bucket_order);
 
 	ret = prealloc_shrinker(&workingset_shadow_shrinker, "mm-shadow");
 	if (ret)
-- 
2.41.0