[PATCH v8 14/16] of/numa: remove the constraint on the distances of node pairs
From: Zhen Lei <hidden>
Date: 2016-09-01 06:58:46
Also in:
linux-arm-kernel, linux-mm, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
At present, the distances must equal in both direction for each node pairs. For example: the distance of node B->A must the same to A->B. But we really don't have to do this. End up fill default distances as below: 1. If both direction specified, keep no change. 2. If only one direction specified, assign it to the other direction. 3. If none of the two direction specified, both are assigned to REMOTE_DISTANCE. Signed-off-by: Zhen Lei <redacted> Acked-by: Rob Herring <robh@kernel.org> --- drivers/of/of_numa.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
index f63d4b0d..1840045 100644
--- a/drivers/of/of_numa.c
+++ b/drivers/of/of_numa.c@@ -127,15 +127,25 @@ static int __init of_numa_parse_distance_map_v1(struct device_node *map) numa_set_distance(nodea, nodeb, distance); pr_debug("distance[node%d -> node%d] = %d\n", nodea, nodeb, distance); - - /* Set default distance of node B->A same as A->B */ - if (nodeb > nodea) - numa_set_distance(nodeb, nodea, distance); } return 0; } +static void __init fill_default_distances(void) +{ + int i, j; + + for (i = 0; i < nr_node_ids; i++) + for (j = 0; j < nr_node_ids; j++) + if (i == j) + numa_set_distance(i, j, LOCAL_DISTANCE); + else if (!node_distance(i, j)) + numa_set_distance(i, j, + node_distance(j, i) ? : REMOTE_DISTANCE); + +} + static int __init of_numa_parse_distance_map(void) { int ret = 0;
@@ -145,8 +155,10 @@ static int __init of_numa_parse_distance_map(void) "numa-distance-map-v1"); if (np) ret = of_numa_parse_distance_map_v1(np); - of_node_put(np); + + fill_default_distances(); + return ret; } --
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