linux-kernel - [RFC PATCH v2 08/11] time: Convert xen_read

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Date:	Thu, 30 Oct 2014 19:15:42 +0800
From:	"pang.xunlei" <pang.xunlei@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	rtc-linux@...glegroups.com, xen-devel@...ts.xenproject.org,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"pang.xunlei" <pang.xunlei@...aro.org>
Subject: [RFC PATCH v2 08/11] time: Convert xen_read_wallclock() to use timespec64

As part of addressing 2038 safety for in-kernel uses, this patch
creates no functional change, converts xen_read_wallclock() to
use timespec64 instead of timespec.

Signed-off-by: pang.xunlei <pang.xunlei@...aro.org>
---
 arch/x86/xen/time.c |   23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 16fce39..4e14439 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -169,20 +169,27 @@ static cycle_t xen_clocksource_get_cycles(struct clocksource *cs)
 	return xen_clocksource_read();
 }
 
-static void xen_read_wallclock(struct timespec *ts)
+static void xen_read_wallclock(struct timespec64 *ts)
 {
+	struct timespec ts_unsafe;
 	struct shared_info *s = HYPERVISOR_shared_info;
 	struct pvclock_wall_clock *wall_clock = &(s->wc);
         struct pvclock_vcpu_time_info *vcpu_time;
 
 	vcpu_time = &get_cpu_var(xen_vcpu)->time;
-	pvclock_read_wallclock(wall_clock, vcpu_time, ts);
+	/* TODO: [2038 safety] pvclock_read_wallclock() uses timespec64 */
+	pvclock_read_wallclock(wall_clock, vcpu_time, &ts_unsafe);
+	*ts = timespec_to_timespec64(ts_unsafe);
 	put_cpu_var(xen_vcpu);
 }
 
+/* TODO: [2038 safety] xen_get_wallclock() uses timespec64 */
 static void xen_get_wallclock(struct timespec *now)
 {
-	xen_read_wallclock(now);
+	struct timespec64 now64;
+
+	xen_read_wallclock(&now64);
+	*now = timespec64_to_timespec(now64);
 }
 
 static int xen_set_wallclock(const struct timespec *now)
@@ -485,8 +492,7 @@ static const struct pv_time_ops xen_time_ops __initconst = {
 static void __init xen_time_init(void)
 {
 	int cpu = smp_processor_id();
-	struct timespec tp;
-	struct timespec64 tp64;
+	struct timespec64 tp;
 
 	clocksource_register_hz(&xen_clocksource, NSEC_PER_SEC);
 
@@ -497,13 +503,8 @@ static void __init xen_time_init(void)
 		xen_clockevent = &xen_vcpuop_clockevent;
 	}
 
-	/*
-	 * Set initial system time with full resolution
-	 * TODO: [2038 safety] xen_read_wallclock() uses timespec64
-	 */
 	xen_read_wallclock(&tp);
-	tp64 = timespec_to_timespec64(tp);
-	do_settimeofday64(&tp64);
+	do_settimeofday64(&tp);
 
 	setup_force_cpu_cap(X86_FEATURE_TSC);
 
-- 
1.7.9.5

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