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Date: Fri, 22 May 2015 14:18:30 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org,
        kvm@vger.kernel.org, linux-api@vger.kernel.org,
        Pavel Emelyanov <xemul@parallels.com>,
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        Johannes Weiner <hannes@cmpxchg.org>,
        "Huangpeng (Peter)" <peter.huangpeng@huawei.com>
Subject: Re: [PATCH 22/23] userfaultfd: avoid mmap_sem read recursion in
 mcopy_atomic
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There's a more serious failure with i386 allmodconfig:

fs/userfaultfd.c:145:2: note: in expansion of macro 'BUILD_BUG_ON'
  BUILD_BUG_ON(sizeof(struct uffd_msg) != 32);

I'm surprised the feature is even reachable on i386 builds?
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