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Subject: Re: [PATCH] arm/xen: Don't probe xenbus as part of an early initcall
To:     Julien Grall <julien@xen.org>, xen-devel@lists.xenproject.org
Cc:     sstabellini@kernel.org, boris.ostrovsky@oracle.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Julien Grall <jgrall@amazon.com>,
        Ian Jackson <iwj@xenproject.org>, dwmw@amazon.co.uk
References: <20210210170654.5377-1-julien@xen.org>
From:   =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= <jgross@suse.com>
Message-ID: <06a4feb3-a29e-221d-cdb6-68b9c453b2a4@suse.com>
Date:   Thu, 11 Feb 2021 07:55:42 +0100
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From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= <jgross@suse.com>
To: Julien Grall <julien@xen.org>, xen-devel@lists.xenproject.org
Cc: sstabellini@kernel.org, boris.ostrovsky@oracle.com,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Julien Grall <jgrall@amazon.com>, Ian Jackson <iwj@xenproject.org>,
 dwmw@amazon.co.uk
Message-ID: <06a4feb3-a29e-221d-cdb6-68b9c453b2a4@suse.com>
Subject: Re: [PATCH] arm/xen: Don't probe xenbus as part of an early initcall
References: <20210210170654.5377-1-julien@xen.org>
In-Reply-To: <20210210170654.5377-1-julien@xen.org>

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On 10.02.21 18:06, Julien Grall wrote:
> From: Julien Grall <jgrall@amazon.com>
>=20
> After Commit 3499ba8198cad ("xen: Fix event channel callback via
> INTX/GSI"), xenbus_probe() will be called too early on Arm. This will
> recent to a guest hang during boot.
>=20
> If there hang wasn't there, we would have ended up to call
> xenbus_probe() twice (the second time is in xenbus_probe_initcall()).
>=20
> We don't need to initialize xenbus_probe() early for Arm guest.
> Therefore, the call in xen_guest_init() is now removed.
>=20
> After this change, there is no more external caller for xenbus_probe().=

> So the function is turned to a static one. Interestingly there were two=

> prototypes for it.
>=20
> Fixes: 3499ba8198cad ("xen: Fix event channel callback via INTX/GSI")
> Reported-by: Ian Jackson <iwj@xenproject.org>
> Signed-off-by: Julien Grall <jgrall@amazon.com>

Pushed to xen/tip.git for-linus-5.11


Juergen

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