linux-kernel - [v2 9/9] x86/tsc: use tsc early

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Date:   Fri, 24 Mar 2017 11:21:39 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, tglx@...utronix.de, hpa@...or.com
Subject: [v2 9/9] x86/tsc: use tsc early

Call tsc_early_init() to initialize early boot time stamps functionality on
the supported x86 platforms, and call tsc_early_fini() to finish this
feature after permanent tsc has been initialized.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 arch/x86/kernel/head64.c | 1 +
 arch/x86/kernel/time.c   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index b5785c1..1068a56 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -157,6 +157,7 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
 	clear_bss();
 
 	clear_page(init_level4_pgt);
+	tsc_early_init();
 
 	kasan_early_init();
 
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index d39c091..2d691eb3 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -85,6 +85,7 @@ static __init void x86_late_time_init(void)
 {
 	x86_init.timers.timer_init();
 	tsc_init();
+	tsc_early_fini();
 }
 
 /*
-- 
1.8.3.1