linux-kernel - [tip:x86/cache] x86/intel_rdt: Add check to determine if monitoring in progress

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Date:   Tue, 19 Jun 2018 17:24:27 -0700
From:   tip-bot for Reinette Chatre <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, reinette.chatre@...el.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:x86/cache] x86/intel_rdt: Add check to determine if monitoring
 in progress

Commit-ID:  8938db1da6e73ef2217c7ae304a89f8e29ad22c7
Gitweb:     https://git.kernel.org/tip/8938db1da6e73ef2217c7ae304a89f8e29ad22c7
Author:     Reinette Chatre <reinette.chatre@...el.com>
AuthorDate: Tue, 29 May 2018 05:57:47 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 20 Jun 2018 00:56:35 +0200

x86/intel_rdt: Add check to determine if monitoring in progress

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@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: fenghua.yu@...el.com
Cc: tony.luck@...el.com
Cc: vikas.shivappa@...ux.intel.com
Cc: gavin.hindman@...el.com
Cc: jithu.joseph@...el.com
Cc: dave.hansen@...el.com
Cc: hpa@...or.com
Link: https://lkml.kernel.org/r/d3efe6b526e28e335463578870ec7d5dc91ed96d.1527593971.git.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 dc79b3090ac5..8693dbe602a2 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
@@ -13,6 +13,19 @@
 
 #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