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From:   Reinette Chatre <reinette.chatre@intel.com>
To:     tglx@linutronix.de, fenghua.yu@intel.com, tony.luck@intel.com,
        vikas.shivappa@linux.intel.com
Cc:     gavin.hindman@intel.com, jithu.joseph@intel.com,
        dave.hansen@intel.com, mingo@redhat.com, hpa@zytor.com,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        Reinette Chatre <reinette.chatre@intel.com>
Subject: [PATCH V3 22/39] x86/intel_rdt: Add check to determine if monitoring in progress
Date:   Wed, 25 Apr 2018 03:09:58 -0700
Message-Id: <5bb877fd392bd61947c6a6f6d187cf8362eecabe.1524649902.git.reinette.chatre@intel.com>
In-Reply-To: <cover.1524649902.git.reinette.chatre@intel.com>
References: <cover.1524649902.git.reinette.chatre@intel.com>
In-Reply-To: <cover.1524649902.git.reinette.chatre@intel.com>
References: <cover.1524649902.git.reinette.chatre@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
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When a resource group is pseudo-locked it is orphaned without a class of
service associated with it. We thus do not want any monitoring in
progress on a resource group that will be used for pseudo-locking.

Introduce a test that can be used to determine if pseudo-locking in
progress on a resource group. Temporarily mark it as unused to avoid
compile warnings until it is used.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
 arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
index a373ca3ff567..6f86625288b3 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
@@ -22,6 +22,19 @@
 #include "intel_rdt.h"
 
 /**
+ * rdtgroup_monitor_in_progress - Test if monitoring in progress
+ * @r: resource group being queried
+ *
+ * Return: 1 if monitor groups have been created for this resource
+ * group, 0 otherwise.
+ */
+static int __attribute__ ((unused))
+rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
+{
+	return !list_empty(&rdtgrp->mon.crdtgrp_list);
+}
+
+/**
  * rdtgroup_locksetup_user_restrict - Restrict user access to group
  * @rdtgrp: resource group needing access restricted
  *
-- 
2.13.6