On Fri, 4 Sep 2020 15:24:22 +0200 mateusznosek0@xxxxxxxxx wrote:
> From: Mateusz Nosek <mateusznosek0@xxxxxxxxx>
>
> Previously variable 'tmp' was initialized, but was not read later
> before reassigning. So the initialization can be removed.
>
> ...
>
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5637,7 +5637,7 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask)
> int n, val;
> int min_val = INT_MAX;
> int best_node = NUMA_NO_NODE;
> - const struct cpumask *tmp = cpumask_of_node(0);
> + const struct cpumask *tmp;
>
> /* Use the local node if we haven't already */
> if (!node_isset(node, *used_node_mask)) {
OK. But we may as well kill tmp altogether?
--- a/mm/page_alloc.c~mm-page_allocc-clean-code-by-removing-unnecessary-initialization-fix
+++ a/mm/page_alloc.c
@@ -5637,7 +5637,6 @@ static int find_next_best_node(int node,
int n, val;
int min_val = INT_MAX;
int best_node = NUMA_NO_NODE;
- const struct cpumask *tmp;
/* Use the local node if we haven't already */
if (!node_isset(node, *used_node_mask)) {
@@ -5658,8 +5657,7 @@ static int find_next_best_node(int node,
val += (n < node);
/* Give preference to headless and unused nodes */
- tmp = cpumask_of_node(n);
- if (!cpumask_empty(tmp))
+ if (!cpumask_empty(cpumask_of_node(n)))
val += PENALTY_FOR_NODE_WITH_CPUS;
/* Slight preference for less loaded node */
_
