linux-kernel - [PATCH v3 08/26] x86/resctrl: Refactor domain_remove_cpu

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Message-ID: <20250407234032.241215-9-tony.luck@intel.com>
Date: Mon,  7 Apr 2025 16:40:10 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghuay@...dia.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>,
	Anil Keshavamurthy <anil.s.keshavamurthy@...el.com>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v3 08/26] x86/resctrl: Refactor domain_remove_cpu_mon() ready for new domain types

Different types of domains require different actions when the last
CPU in the domain is removed.

Refactor to make it easy to add new actions for new types of domains.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 703423b0be0e..7080447028b0 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -644,17 +644,19 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
 	if (WARN_ON_ONCE(hdr->type != DOMTYPE(r->rid, DOMTYPE_MON)))
 		return;
 
-	d = container_of(hdr, struct rdt_mon_domain, hdr);
-	hw_dom = resctrl_to_arch_mon_dom(d);
+	cpumask_clear_cpu(cpu, &hdr->cpu_mask);
+	if (!cpumask_empty(&hdr->cpu_mask))
+		return;
 
-	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
-	if (cpumask_empty(&d->hdr.cpu_mask)) {
+	switch (r->rid) {
+	case RDT_RESOURCE_L3:
+		d = container_of(hdr, struct rdt_mon_domain, hdr);
+		hw_dom = resctrl_to_arch_mon_dom(d);
 		resctrl_offline_mon_domain(r, d);
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
 		mon_domain_free(hw_dom);
-
-		return;
+		break;
 	}
 }
 
-- 
2.48.1