From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by kanga.kvack.org (Postfix) with ESMTP id D4927829CE for ; Fri, 22 May 2015 17:18:32 -0400 (EDT) Received: by paza2 with SMTP id a2so19564826paz.3 for ; Fri, 22 May 2015 14:18:32 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id mo9si5093138pbc.22.2015.05.22.14.18.31 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 22 May 2015 14:18:32 -0700 (PDT) Date: Fri, 22 May 2015 14:18:30 -0700 From: Andrew Morton Subject: Re: [PATCH 22/23] userfaultfd: avoid mmap_sem read recursion in mcopy_atomic Message-Id: <20150522141830.f969b285ad072a23bb28f196@linux-foundation.org> In-Reply-To: <20150522204809.GB4251@redhat.com> References: <1431624680-20153-1-git-send-email-aarcange@redhat.com> <1431624680-20153-23-git-send-email-aarcange@redhat.com> <20150522131822.74f374dd5a75a0285577c714@linux-foundation.org> <20150522204809.GB4251@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrea Arcangeli 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 , Sanidhya Kashyap , zhang.zhanghailiang@huawei.com, Linus Torvalds , "Kirill A. Shutemov" , Andres Lagar-Cavilla , Dave Hansen , Paolo Bonzini , Rik van Riel , Mel Gorman , Andy Lutomirski , Hugh Dickins , Peter Feiner , "Dr. David Alan Gilbert" , Johannes Weiner , "Huangpeng (Peter)" 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? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org