linux-kernel - Re: [RFC PATCH -v2.1] x86: Kill notsc

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Date:	Mon, 16 Nov 2015 22:25:36 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Borislav Petkov <bp@...en8.de>
cc:	Peter Zijlstra <peterz@...radead.org>, x86-ml <x86@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH -v2.1] x86: Kill notsc

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.

Thanks,

	tglx
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