linux-kernel - [tip: sched/core] net: Decouple HK_FLAG_WQ and HK_FLAG

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Message-ID: <164512420898.16921.9921602007161018305.tip-bot2@tip-bot2>
Date:   Thu, 17 Feb 2022 18:56:48 -0000
From:   "tip-bot2 for Frederic Weisbecker" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Phil Auld <pauld@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     c8fb9f22ae22dbe06a43b77717299e1c3e632d5c
Gitweb:        https://git.kernel.org/tip/c8fb9f22ae22dbe06a43b77717299e1c3e632d5c
Author:        Frederic Weisbecker <frederic@...nel.org>
AuthorDate:    Mon, 07 Feb 2022 16:59:05 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 16 Feb 2022 15:57:54 +01:00

net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch

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@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Juri Lelli <juri.lelli@...hat.com>
Reviewed-by: Phil Auld <pauld@...hat.com>
Link: https://lore.kernel.org/r/20220207155910.527133-4-frederic@kernel.org
---
 net/core/net-sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 53ea262..ed8da7b 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -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;