linux-kernel - [PATCH] xen: add static initialization of steal_clock op to xen_time

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Date:	Tue, 26 Jul 2016 14:15:11 +0200
From:	Juergen Gross <jgross@...e.com>
To:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	Juergen Gross <jgross@...e.com>
Subject: [PATCH] xen: add static initialization of steal_clock op to xen_time_ops

pv_time_ops might be overwritten with xen_time_ops after the
steal_clock operation has been initialized already. To prevent calling
a now uninitialized function pointer add the steal_clock static
initialization to xen_time_ops.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/xen/time.c   | 1 +
 drivers/xen/time.c    | 2 +-
 include/xen/xen-ops.h | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index c31006f..a3e8f08 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -359,6 +359,7 @@ void xen_timer_resume(void)
 
 static const struct pv_time_ops xen_time_ops __initconst = {
 	.sched_clock = xen_clocksource_read,
+	.steal_clock = xen_steal_clock,
 };
 
 static void __init xen_time_init(void)
diff --git a/drivers/xen/time.c b/drivers/xen/time.c
index a7fe35b..e6f9b2b 100644
--- a/drivers/xen/time.c
+++ b/drivers/xen/time.c
@@ -80,7 +80,7 @@ bool xen_vcpu_stolen(int vcpu)
 	return per_cpu(xen_runstate, vcpu).state == RUNSTATE_runnable;
 }
 
-static u64 xen_steal_clock(int cpu)
+u64 xen_steal_clock(int cpu)
 {
 	struct vcpu_runstate_info state;
 
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 77bf9d1..0d1f9b9 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -23,6 +23,7 @@ bool xen_vcpu_stolen(int vcpu);
 void xen_setup_runstate_info(int cpu);
 void xen_time_setup_guest(void);
 void xen_get_runstate_snapshot(struct vcpu_runstate_info *res);
+u64 xen_steal_clock(int cpu);
 
 int xen_setup_shutdown_event(void);
 
-- 
2.6.6