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net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch

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To prepare for supporting each feature of the housekeeping cpumask
toward cpuset, prepare each of the HK_FLAG_* entries to move to their
own cpumask with enforcing to fetch them individually. The new
constraint is that multiple HK_FLAG_* entries can't be mixed together
anymore in a single call to housekeeping cpumask().

This will later allow, for example, to runtime modify the cpulist passed
through "isolcpus=", "nohz_full=" and "rcu_nocbs=" kernel boot
parameters.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Phil Auld <pauld@redhat.com>
Link: https://lore.kernel.org/r/20220207155910.527133-4-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker 2022-02-07 16:59:05 +01:00 committed by Peter Zijlstra
parent 7b45b51e77
commit c8fb9f22ae
1 changed files with 3 additions and 3 deletions
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6
net/core/net-sysfs.c
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@ -823,7 +823,7 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue,
{
struct rps_map *old_map, *map;
cpumask_var_t mask;
int err, cpu, i, hk_flags;
int err, cpu, i;
static DEFINE_MUTEX(rps_map_mutex);
if (!capable(CAP_NET_ADMIN))
@ -839,8 +839,8 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue,
}
if (!cpumask_empty(mask)) {
hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
cpumask_and(mask, mask, housekeeping_cpumask(HK_FLAG_DOMAIN));
cpumask_and(mask, mask, housekeeping_cpumask(HK_FLAG_WQ));
if (cpumask_empty(mask)) {
free_cpumask_var(mask);
return -EINVAL;