linux-kernel - Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed

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Date:   Wed, 20 Oct 2021 14:04:23 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is
 needed

On 20/10/21 14:01, Wanpeng Li wrote:
> Yes, in the attachment.
> 
>      Wanpeng

This one does not have CONFIG_PREEMPT=y, let alone CONFIG_PREEMPT_RCU. 
It's completely impossible that this patch has an effect without those 
options.

Paolo