linux-kernel - Re: [RFC PATCH 09/26] x86/paravirt: Add runtime

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Message-ID: <20200408110501.GS20713@hirez.programming.kicks-ass.net>
Date:   Wed, 8 Apr 2020 13:05:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ankur Arora <ankur.a.arora@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
        jpoimboe@...hat.com, namit@...are.com, mhiramat@...nel.org,
        jgross@...e.com, bp@...en8.de, vkuznets@...hat.com,
        pbonzini@...hat.com, boris.ostrovsky@...cle.com,
        mihai.carabas@...cle.com, kvm@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH 09/26] x86/paravirt: Add runtime_patch()

On Tue, Apr 07, 2020 at 10:03:06PM -0700, Ankur Arora wrote:
> +/*
> + * preempt_enable_no_resched() so we don't add any preemption points until
> + * after the caller has returned.
> + */
> +#define preempt_enable_runtime_patch()	preempt_enable_no_resched()
> +#define preempt_disable_runtime_patch()	preempt_disable()

NAK, this is probably a stright preemption bug, also, afaict, there
aren't actually any users of this in the patch-set.