From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH] tools/libxc: Set max_elem to zero in
 xc_lockprof_query_number()
Date: Tue, 26 Aug 2014 22:13:13 +0100
Message-ID: <1409087593.28009.49.camel@citrix.com>
References: <1407948038-13998-1-git-send-email-boris.ostrovsky@oracle.com>
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To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel@lists.xenproject.org, ian.jackson@eu.citrix.com, stefano.stabellini@eu.citrix.com
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On Wed, 2014-08-13 at 12:40 -0400, Boris Ostrovsky wrote:
> If max_elem is not zero then hypervisor's spinlock_profile_ucopy_elem()
> will attempt to copy profile data into user's data buffer. Since this
> buffer is explicitly set to (the equivalent of) NULL the copy will fail,
> causing xenlockprof to fail as well.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

I would have expected DECLARE_SYSCTL to zero the struct, but anyway:
Acked + applied, thanks (and sorry for the delay).