linux-kernel - Re: [PATCH v14 05/12] x86/smpboot: Split up native_cpu_up into separate phases and document them

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Date:   Sat, 11 Mar 2023 11:19:10 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Usama Arif <usama.arif@...edance.com>, dwmw2@...radead.org,
        kim.phillips@....com, brgerst@...il.com
Cc:     piotrgorski@...hyos.org, oleksandr@...alenko.name,
        arjan@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, x86@...nel.org,
        pbonzini@...hat.com, paulmck@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        rcu@...r.kernel.org, mimoja@...oja.de, hewenliang4@...wei.com,
        thomas.lendacky@....com, seanjc@...gle.com, pmenzel@...gen.mpg.de,
        fam.zheng@...edance.com, punit.agrawal@...edance.com,
        simon.evans@...edance.com, liangma@...ngbit.com,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>,
        "Guilherme G . Piccoli" <gpiccoli@...lia.com>
Subject: Re: [PATCH v14 05/12] x86/smpboot: Split up native_cpu_up into
 separate phases and document them

On Wed, Mar 08 2023 at 17:13, Usama Arif wrote:
>  
> +int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
> +{
> +	int ret;
> +
> +	ret = do_cpu_up(cpu, tidle);
> +	if (ret)
> +		return ret;

In case of error this leaves the warm reset vector dangling.

> +	ret = do_wait_cpu_initialized(cpu);
> +	if (ret)
> +		return ret;
> +
> +	ret = do_wait_cpu_callin(cpu);
> +	if (ret)
> +		return ret;

Same for these two error returns.

Thanks,

        tglx