linux-kernel - [tip: x86/cache] x86/resctrl: Clean up domain_remove_cpu

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Message-ID: <176807437812.510.9221014618704007204.tip-bot2@tip-bot2>
Date: Sat, 10 Jan 2026 19:46:18 -0000
From: "tip-bot2 for Tony Luck" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Tony Luck <tony.luck@...el.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] x86/resctrl: Clean up domain_remove_cpu_ctrl()

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     c1b630573c8ca51a89bd480f7eeaf8754c7609f2
Gitweb:        https://git.kernel.org/tip/c1b630573c8ca51a89bd480f7eeaf8754c7609f2
Author:        Tony Luck <tony.luck@...el.com>
AuthorDate:    Wed, 17 Dec 2025 09:20:51 -08:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Sun, 04 Jan 2026 08:41:55 +01:00

x86/resctrl: Clean up domain_remove_cpu_ctrl()

For symmetry with domain_remove_cpu_mon() refactor domain_remove_cpu_ctrl()
to take an early return when removing a CPU does not empty the domain.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com
---
 arch/x86/kernel/cpu/resctrl/core.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 49b133e..64ed81c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -604,28 +604,27 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 		return;
 	}
 
+	cpumask_clear_cpu(cpu, &hdr->cpu_mask);
+	if (!cpumask_empty(&hdr->cpu_mask))
+		return;
+
 	if (!domain_header_is_valid(hdr, RESCTRL_CTRL_DOMAIN, r->rid))
 		return;
 
 	d = container_of(hdr, struct rdt_ctrl_domain, hdr);
 	hw_dom = resctrl_to_arch_ctrl_dom(d);
 
-	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
-	if (cpumask_empty(&d->hdr.cpu_mask)) {
-		resctrl_offline_ctrl_domain(r, d);
-		list_del_rcu(&d->hdr.list);
-		synchronize_rcu();
-
-		/*
-		 * rdt_ctrl_domain "d" is going to be freed below, so clear
-		 * its pointer from pseudo_lock_region struct.
-		 */
-		if (d->plr)
-			d->plr->d = NULL;
-		ctrl_domain_free(hw_dom);
+	resctrl_offline_ctrl_domain(r, d);
+	list_del_rcu(&hdr->list);
+	synchronize_rcu();
 
-		return;
-	}
+	/*
+	 * rdt_ctrl_domain "d" is going to be freed below, so clear
+	 * its pointer from pseudo_lock_region struct.
+	 */
+	if (d->plr)
+		d->plr->d = NULL;
+	ctrl_domain_free(hw_dom);
 }
 
 static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)