linux-kernel - Re: [PATCH] x86/timers: Move simple_udelay_calibration past init_hypervisor

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Message-ID: <5926357C.2090708@linux.intel.com>
Date:   Thu, 25 May 2017 09:38:04 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86 <x86@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/timers: Move simple_udelay_calibration past
 init_hypervisor_platform



On 05/25/2017 02:04 AM, Jan Kiszka wrote:
> This ensures that adjustments to x86_platform done by the hypervisor
> setup is already respected by this simple calibration.
>
> The current user of this, introduced by 1b5aeebf3a92 ("x86/earlyprintk:
> Add support for earlyprintk via USB3 debug port"), comes much later
> into play.

Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>

>
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  arch/x86/kernel/setup.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 0b4d3c686b1e..f81823695014 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -980,8 +980,6 @@ void __init setup_arch(char **cmdline_p)
>  	 */
>  	x86_configure_nx();
>  
> -	simple_udelay_calibration();
> -
>  	parse_early_param();
>  
>  #ifdef CONFIG_MEMORY_HOTPLUG
> @@ -1041,6 +1039,8 @@ void __init setup_arch(char **cmdline_p)
>  	 */
>  	init_hypervisor_platform();
>  
> +	simple_udelay_calibration();
> +
>  	x86_init.resources.probe_roms();
>  
>  	/* after parse_early_param, so could debug it */
>