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Merge tag 'sched_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull scheduler fix from Borislav Petkov:
 "Revert an attempt to not spread IRQ threads on isolated CPUs which has
  a bunch of problems"

* tag 'sched_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "lib: Restrict cpumask_local_spread to houskeeping CPUs"
This commit is contained in:
Linus Torvalds
2021-02-07 10:03:43 -08:00
parent 814daadbf0 2452483d95
commit 6fed85df5d
1 changed files with 5 additions and 11 deletions
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16
lib/cpumask.c
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@@ -6,7 +6,6 @@
#include <linux/export.h>
#include <linux/memblock.h>
#include <linux/numa.h>
#include <linux/sched/isolation.h>
/**
* cpumask_next - get the next cpu in a cpumask
@@ -206,27 +205,22 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask)
*/
unsigned int cpumask_local_spread(unsigned int i, int node)
{
int cpu, hk_flags;
const struct cpumask *mask;
int cpu;
hk_flags = HK_FLAG_DOMAIN | HK_FLAG_MANAGED_IRQ;
mask = housekeeping_cpumask(hk_flags);
/* Wrap: we always want a cpu. */
i %= cpumask_weight(mask);
i %= num_online_cpus();
if (node == NUMA_NO_NODE) {
for_each_cpu(cpu, mask) {
for_each_cpu(cpu, cpu_online_mask)
if (i-- == 0)
return cpu;
}
} else {
/* NUMA first. */
for_each_cpu_and(cpu, cpumask_of_node(node), mask) {
for_each_cpu_and(cpu, cpumask_of_node(node), cpu_online_mask)
if (i-- == 0)
return cpu;
}
for_each_cpu(cpu, mask) {
for_each_cpu(cpu, cpu_online_mask) {
/* Skip NUMA nodes, done above. */
if (cpumask_test_cpu(cpu, cpumask_of_node(node)))
continue;