From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com
Cc: x86@kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] Calling check_system_tsc_reliable before unsynchronized_tsc
Date: Thu, 8 Jun 2017 19:43:03 +0800 [thread overview]
Message-ID: <f02f774b-1840-a8d5-0235-e9ee2b501c26@oracle.com> (raw)
unsynchronized_tsc() checks value of tsc_clocksource_reliable which is set by
check_system_tsc_reliable(). It's better to move check_system_tsc_reliable() at
front, or else this check makes no sense.
Though X86_FEATURE_CONSTANT_TSC is usually set for TSC reliable system, just in
case.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
---
arch/x86/kernel/tsc.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 714dfba..a316bdd 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1412,11 +1412,11 @@ void __init tsc_init(void)
use_tsc_delay();
+ check_system_tsc_reliable();
+
if (unsynchronized_tsc())
mark_tsc_unstable("TSCs unsynchronized");
- check_system_tsc_reliable();
-
detect_art();
}
--
1.7.3
next reply other threads:[~2017-06-08 11:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-08 11:43 Zhenzhong Duan [this message]
2017-06-12 16:03 ` Thomas Gleixner
2017-06-13 2:47 ` Zhenzhong Duan
2017-06-20 13:14 ` Thomas Gleixner
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