linux-kernel - Re: [PATCH] KVM: arm64: Select SCHED

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Date:   Wed, 23 Oct 2019 13:32:10 +0100
From:   Steven Price <steven.price@....com>
To:     Mao Wenan <maowenan@...wei.com>
Cc:     "maz@...nel.org" <maz@...nel.org>,
        James Morse <James.Morse@....com>,
        "julien.thierry.kdev@...il.com" <julien.thierry.kdev@...il.com>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Catalin Marinas <Catalin.Marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] KVM: arm64: Select SCHED_INFO before SCHEDSTATS

On Wed, Oct 23, 2019 at 04:22:54AM +0100, Mao Wenan wrote:
> If KVM=y, it will select SCHEDSTATS, below erros can
> be seen:
> kernel/sched/stats.h: In function rq_sched_info_arrive:
> kernel/sched/stats.h:12:20: error: struct sched_info
> has no member named run_delay
>    rq->rq_sched_info.run_delay += delta;
>                     ^
> kernel/sched/stats.h:13:20: error: struct sched_info
> has no member named pcount
>    rq->rq_sched_info.pcount++;
>                     ^
> kernel/sched/stats.h: In function rq_sched_info_dequeued:
> kernel/sched/stats.h:31:20: error: struct sched_info has
> no member named run_delay
>    rq->rq_sched_info.run_delay += delta;
> 
> These are because CONFIG_SCHED_INFO is not set, This patch 
> is to select SCHED_INFO before SCHEDSTATS.

It looks like I didn't spot this because when DEBUG_KERNEL is enabled
then KVM selects SCHEDSTATS, which selects SCHED_INFO. Thanks for
spotting this.

> 
> Fixes: 8564d6372a7d ("KVM: arm64: Support stolen time reporting via shared structure")
> Signed-off-by: Mao Wenan <maowenan@...wei.com>

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  arch/arm64/kvm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> index d8b88e4..3c46eac 100644
> --- a/arch/arm64/kvm/Kconfig
> +++ b/arch/arm64/kvm/Kconfig
> @@ -39,6 +39,7 @@ config KVM
>  	select IRQ_BYPASS_MANAGER
>  	select HAVE_KVM_IRQ_BYPASS
>  	select HAVE_KVM_VCPU_RUN_PID_CHANGE
> +	select SCHED_INFO
>  	select SCHEDSTATS
>  	---help---
>  	  Support hosting virtualized guest machines.
> -- 
> 2.7.4
>