From: Richard Henderson <richard.henderson@linaro.org>
To: Greg Kurz <groug@kaod.org>, qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
qemu-stable@nongnu.org
Subject: Re: [PATCH v3 2/2] accel/tcg: Register a force_rcu notifier
Date: Tue, 9 Nov 2021 09:21:27 +0100 [thread overview]
Message-ID: <8a184041-39ad-1207-f32b-673e2b8da0f2@linaro.org> (raw)
In-Reply-To: <5892d9dd-5f0c-d745-6a0a-84485e0e29c3@linaro.org>
On 11/9/21 8:54 AM, Richard Henderson wrote:
> On 11/8/21 12:33 PM, Greg Kurz wrote:
>> +static void rr_force_rcu(Notifier *notify, void *data)
>> +{
>> + /*
>> + * Called with rcu_registry_lock held, using async_run_on_cpu() ensures
>> + * that there are no deadlocks.
>> + */
>> + async_run_on_cpu(first_cpu, do_nothing, RUN_ON_CPU_NULL);
>> +}
>
> Should first_cpu really be rr_current_cpu?
> It's not clear to me that this will work for -smp 2 -cpu thread=single.
Alternately, no async_run_on_cpu at all, just rr_kick_next_cpu().
r~
next prev parent reply other threads:[~2021-11-09 8:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-08 11:33 [PATCH v3 0/2] accel/tcg: Fix monitor deadlock Greg Kurz
2021-11-08 11:33 ` [PATCH v3 1/2] rcu: Introduce force_rcu notifier Greg Kurz
2021-11-08 11:33 ` [PATCH v3 2/2] accel/tcg: Register a " Greg Kurz
2021-11-09 7:54 ` Richard Henderson
2021-11-09 8:21 ` Richard Henderson [this message]
2021-11-09 17:24 ` Greg Kurz
2021-11-09 18:03 ` Paolo Bonzini
2021-11-09 18:29 ` Greg Kurz
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