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Subject: Re: [PATCH v2 3/8] xen/events: avoid handling the same event on two
 cpus at the same time
To:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc:     Stefano Stabellini <sstabellini@kernel.org>,
        Julien Grall <julien@xen.org>
References: <20210211101616.13788-1-jgross@suse.com>
 <20210211101616.13788-4-jgross@suse.com>
 <6cc74d6b-d537-0e9f-9da8-45456f6b703e@oracle.com>
From:   =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= <jgross@suse.com>
Message-ID: <63e42922-204d-9d0e-6a02-49f64e7e8885@suse.com>
Date:   Thu, 18 Feb 2021 12:47:04 +0100
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From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= <jgross@suse.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
 xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Stefano Stabellini <sstabellini@kernel.org>, Julien Grall <julien@xen.org>
Message-ID: <63e42922-204d-9d0e-6a02-49f64e7e8885@suse.com>
Subject: Re: [PATCH v2 3/8] xen/events: avoid handling the same event on two
 cpus at the same time
References: <20210211101616.13788-1-jgross@suse.com>
 <20210211101616.13788-4-jgross@suse.com>
 <6cc74d6b-d537-0e9f-9da8-45456f6b703e@oracle.com>
In-Reply-To: <6cc74d6b-d537-0e9f-9da8-45456f6b703e@oracle.com>

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On 15.02.21 22:35, Boris Ostrovsky wrote:
>=20
> On 2/11/21 5:16 AM, Juergen Gross wrote:
>=20
>> @@ -622,6 +623,7 @@ static void xen_irq_lateeoi_locked(struct irq_info=
 *info, bool spurious)
>>   	}
>>  =20
>>   	info->eoi_time =3D 0;
>> +	smp_store_release(&info->is_active, 0);
>=20
>=20
> Can this be done in lateeoi_ack_dynirq()/lateeoi_mask_ack_dynirq(), aft=
er we've masked the channel? Then it will be consistent with how how othe=
r chips do it, especially with the new helper.

Yes, I think this should work.


Juergen

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