linux-kernel - [PATCH 1/1] x86: Hyper-V: Mark the Hyper-V clocksource as being high resolution

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Message-Id: <1435966643-3476-1-git-send-email-kys@microsoft.com>
Date:	Fri,  3 Jul 2015 16:37:23 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	x86@...nel.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
	tglx@...utronix.de
Cc:	Vivek yadav <vyadav@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/1] x86: Hyper-V: Mark the Hyper-V clocksource as being high resolution

From: Vivek yadav <vyadav@...rosoft.com>

By design, alternative clock sources listed are based on the resolution of
current clock source. Once you set a  high resolution clock,
only high resolution sources are returned.
Mark Hyper-V clock source as a high resolution clock source.

Signed-off-by: Vivek yadav <vyadav@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 9b5d7b5..0e507a0 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -151,7 +151,8 @@ static struct clocksource hyperv_cs = {
 	.rating		= 400, /* use this when running on Hyperv*/
 	.read		= read_hv_clock,
 	.mask		= CLOCKSOURCE_MASK(64),
-	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS |
+			  CLOCK_SOURCE_VALID_FOR_HRES,
 };
 
 static void __init ms_hyperv_init_platform(void)
-- 
1.7.4.1

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