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Subject[PATCH 3.16 309/410] xen: Add xen_arch_suspend()
3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@decadent.org.uk>

This is based on commit 2b953a5e994ce279904ec70220f7d4f31d380a0a
upstream, "xen: Suspend ticks on all CPUs during suspend", but
excluding the bug fix in that commit which is not needed in 3.16.
We only need the xen_arch_suspend() hook for the following fix.

Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -91,8 +91,17 @@ static void xen_vcpu_notify_restore(void
clockevents_notify(reason, NULL);
}

+static void xen_vcpu_notify_suspend(void *data)
+{
+}
+
void xen_arch_resume(void)
{
on_each_cpu(xen_vcpu_notify_restore,
(void *)CLOCK_EVT_NOTIFY_RESUME, 1);
}
+
+void xen_arch_suspend(void)
+{
+ on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
+}
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -131,6 +131,8 @@ static void do_suspend(void)
goto out_resume;
}

+ xen_arch_suspend();
+
si.cancelled = 1;

err = stop_machine(xen_suspend, &si, cpumask_of(0));
@@ -148,11 +150,12 @@ static void do_suspend(void)
si.cancelled = 1;
}

+ xen_arch_resume();
+
out_resume:
- if (!si.cancelled) {
- xen_arch_resume();
+ if (!si.cancelled)
xs_resume();
- } else
+ else
xs_suspend_cancel();

dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -12,6 +12,7 @@ void xen_arch_post_suspend(int suspend_c

void xen_timer_resume(void);
void xen_arch_resume(void);
+void xen_arch_suspend(void);

void xen_resume_notifier_register(struct notifier_block *nb);
void xen_resume_notifier_unregister(struct notifier_block *nb);
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