This is a compile-time constant, no need to calculate it on refault.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
---
mm/workingset.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/mm/workingset.c b/mm/workingset.c
index 61ead9e..3ef92f6 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -152,6 +152,10 @@
* refault distance will immediately activate the refaulting page.
*/
+#define EVICTION_SHIFT (RADIX_TREE_EXCEPTIONAL_ENTRY + \
+ ZONES_SHIFT + NODES_SHIFT)
+#define EVICTION_MASK (~0UL >> EVICTION_SHIFT)
+
static void *pack_shadow(unsigned long eviction, struct zone *zone)
{
eviction = (eviction << NODES_SHIFT) | zone_to_nid(zone);
@@ -168,7 +172,6 @@ static void unpack_shadow(void *shadow,
unsigned long entry = (unsigned long)shadow;
unsigned long eviction;
unsigned long refault;
- unsigned long mask;
int zid, nid;
entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT;
@@ -181,8 +184,7 @@ static void unpack_shadow(void *shadow,
*zone = NODE_DATA(nid)->node_zones + zid;
refault = atomic_long_read(&(*zone)->inactive_age);
- mask = ~0UL >> (NODES_SHIFT + ZONES_SHIFT +
- RADIX_TREE_EXCEPTIONAL_SHIFT);
+
/*
* The unsigned subtraction here gives an accurate distance
* across inactive_age overflows in most cases.
@@ -199,7 +201,7 @@ static void unpack_shadow(void *shadow,
* inappropriate activation leading to pressure on the active
* list is not a problem.
*/
- *distance = (refault - eviction) & mask;
+ *distance = (refault - eviction) & EVICTION_MASK;
}
/**
--
2.7.0
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