linux-kernel - [tip:x86/asm] x86/tsc: Do not check X86_FEATURE_CONSTANT

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Message-ID: <tip-a841cca74ea7612508aee161c89987b2646ed769@git.kernel.org>
Date:	Wed, 13 Apr 2016 04:41:47 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	bp@...en8.de, torvalds@...ux-foundation.org, mingo@...nel.org,
	bp@...e.de, peterz@...radead.org, brgerst@...il.com,
	dvlasenk@...hat.com, hpa@...or.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, luto@...capital.net
Subject: [tip:x86/asm] x86/tsc: Do not check X86_FEATURE_CONSTANT_TSC in
 notifier call

Commit-ID:  a841cca74ea7612508aee161c89987b2646ed769
Gitweb:     http://git.kernel.org/tip/a841cca74ea7612508aee161c89987b2646ed769
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Tue, 5 Apr 2016 08:29:52 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Apr 2016 11:37:43 +0200

x86/tsc: Do not check X86_FEATURE_CONSTANT_TSC in notifier call

... because the notifier-registering routine already does that. Also,
rename cpufreq_tsc() init call to something more telling.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1459837795-2588-4-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/tsc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index a0346bc..5bb702c 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -922,9 +922,6 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 	struct cpufreq_freqs *freq = data;
 	unsigned long *lpj;
 
-	if (cpu_has(&cpu_data(freq->cpu), X86_FEATURE_CONSTANT_TSC))
-		return 0;
-
 	lpj = &boot_cpu_data.loops_per_jiffy;
 #ifdef CONFIG_SMP
 	if (!(freq->flags & CPUFREQ_CONST_LOOPS))
@@ -954,7 +951,7 @@ static struct notifier_block time_cpufreq_notifier_block = {
 	.notifier_call  = time_cpufreq_notifier
 };
 
-static int __init cpufreq_tsc(void)
+static int __init cpufreq_register_tsc_scaling(void)
 {
 	if (!boot_cpu_has(X86_FEATURE_TSC))
 		return 0;
@@ -965,7 +962,7 @@ static int __init cpufreq_tsc(void)
 	return 0;
 }
 
-core_initcall(cpufreq_tsc);
+core_initcall(cpufreq_register_tsc_scaling);
 
 #endif /* CONFIG_CPU_FREQ */