(CC Stefano new e-mail address)
Hello Anna-Maria,
On 04/04/2016 13:32, Anna-Maria Gleixner wrote:
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 <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: [email protected]
Signed-off-by: Anna-Maria Gleixner <[email protected]>
---
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.
+ */
NIT: The '*' is not aligned with the others.
+
switch (action) {
case CPU_UP_PREPARE:
if (!per_cpu(cpu_control_block, cpu))
Regards,
--
Julien Grall
