From: "H. Peter Anvin" <hpa@zytor.com>
To: Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>, x86-ml <x86@kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Steven Rostedt <rostedt@goodmis.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH -v2.1] x86: Kill notsc
Date: Mon, 16 Nov 2015 21:02:15 -0800 [thread overview]
Message-ID: <564AB4D7.20606@zytor.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1511162158570.3761@nanos>
On 11/16/15 13:25, Thomas Gleixner wrote:
> On Mon, 16 Nov 2015, Borislav Petkov wrote:
>> -/*
>> - * disable flag for tsc. Takes effect by clearing the TSC cpu flag
>> - * in cpu/common.c
>> - */
>> -int __init notsc_setup(char *str)
>> +/* Disable the TSC feature flag to avoid further TSC use. */
>> +int __init notsc_setup(void)
>> {
>> +#ifndef CONFIG_X86_TSC
>> setup_clear_cpu_cap(X86_FEATURE_TSC);
>
> This is silly, really.
>
> If CONFIG_X86_TSC is disabled then we should just not compile tsc.c at
> all and map cpu_has_tsc and stuff depending on it to false.
>
CONFIG_X86_TSC means TSC is obligatory, not that it is supported.
-hpa
next prev parent reply other threads:[~2015-11-17 5:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-18 14:20 [RFC PATCH] " Borislav Petkov
2015-10-19 4:47 ` Andy Lutomirski
2015-10-19 8:16 ` Borislav Petkov
2015-10-21 17:58 ` Borislav Petkov
2015-10-21 19:01 ` Peter Zijlstra
2015-10-22 18:51 ` [PATCH -v2] " Borislav Petkov
2015-11-04 10:21 ` Thomas Gleixner
2015-11-04 10:29 ` Borislav Petkov
2015-11-16 18:45 ` [RFC PATCH -v2.1] " Borislav Petkov
2015-11-16 21:25 ` Thomas Gleixner
2015-11-17 5:02 ` H. Peter Anvin [this message]
2015-11-17 8:53 ` Borislav Petkov
2015-11-17 9:11 ` Thomas Gleixner
2015-11-17 9:33 ` Borislav Petkov
2015-11-17 10:08 ` Thomas Gleixner
2015-11-17 11:09 ` Borislav Petkov
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