linux-kernel - Re: earlyprintk=xdbc seems broken

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Message-ID: <YcGhWRPSbxNC4Qn9@hirez.programming.kicks-ass.net>
Date:   Tue, 21 Dec 2021 10:41:45 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Subject: Re: earlyprintk=xdbc seems broken

On Tue, Dec 21, 2021 at 10:40:50AM +0100, Peter Zijlstra wrote:
> diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
> index 2e076a459a0c..cd8b5cac542a 100644
> --- a/arch/x86/kernel/tsc.c
> +++ b/arch/x86/kernel/tsc.c
> @@ -1485,6 +1485,7 @@ void __init tsc_early_init(void)
>  	loops_per_jiffy = get_loops_per_jiffy();
>  
>  	tsc_enable_sched_clock();
> +	use_tsc_delay();
>  }
>  
>  void __init tsc_init(void)

Thomas, the above hunk seems right to me; should I make a proper patch
ouf of that or did I overlook something obvious ?