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Date: Mon, 4 Apr 2016 14:32:20 +0200
From: Anna-Maria Gleixner <anna-maria@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: rt@...utronix.de, Anna-Maria Gleixner <anna-maria@...utronix.de>,
David Vrabel <david.vrabel@...rix.com>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
xen-devel@...ts.xenproject.org
Subject: [PATCH] xen: Add comment for missing FROZEN notifier transitions
Xen guests do not offline/online CPUs during suspend/resume and
therefore FROZEN notifier transitions are not required. Add this
explanation as a comment in the code to get not confused why
CPU_TASKS_FROZEN masked transitions are not considered.
Cc: David Vrabel <david.vrabel@...rix.com>
Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc: xen-devel@...ts.xenproject.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
arch/arm/xen/enlighten.c | 6 ++++++
arch/x86/xen/enlighten.c | 7 +++++++
drivers/xen/events/events_fifo.c | 6 ++++++
3 files changed, 19 insertions(+)
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -213,6 +213,12 @@ static int xen_cpu_notification(struct n
unsigned long action,
void *hcpu)
{
+ /*
+ * Xen guests do not offline/online CPUs during
+ * suspend/resume, thus CPU_TASKS_FROZEN masked transitions
+ * are not considered.
+ */
+
switch (action) {
case CPU_STARTING:
xen_percpu_init();
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1788,6 +1788,13 @@ static int xen_hvm_cpu_notify(struct not
void *hcpu)
{
int cpu = (long)hcpu;
+
+ /*
+ * Xen guests do not offline/online CPUs during
+ * suspend/resume, thus CPU_TASKS_FROZEN masked transitions
+ * are not considered.
+ */
+
switch (action) {
case CPU_UP_PREPARE:
xen_vcpu_setup(cpu);
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -425,6 +425,12 @@ static int evtchn_fifo_cpu_notification(
int cpu = (long)hcpu;
int ret = 0;
+ /*
+ * Xen guests do not offline/online CPUs during
+ * suspend/resume, thus CPU_TASKS_FROZEN masked transitions
+ * are not considered.
+ */
+
switch (action) {
case CPU_UP_PREPARE:
if (!per_cpu(cpu_control_block, cpu))
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