From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id 843DC6B0069 for ; Wed, 16 Jul 2014 06:10:10 -0400 (EDT) Received: by mail-pd0-f181.google.com with SMTP id v10so996653pde.12 for ; Wed, 16 Jul 2014 03:10:10 -0700 (PDT) Received: from mail-pa0-x234.google.com (mail-pa0-x234.google.com [2607:f8b0:400e:c03::234]) by mx.google.com with ESMTPS id vt4si14116421pab.110.2014.07.16.03.10.09 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 16 Jul 2014 03:10:09 -0700 (PDT) Received: by mail-pa0-f52.google.com with SMTP id bj1so1034400pad.25 for ; Wed, 16 Jul 2014 03:10:09 -0700 (PDT) Date: Wed, 16 Jul 2014 03:08:31 -0700 (PDT) From: Hugh Dickins Subject: Re: [PATCH v3 5/7] selftests: add memfd/sealing page-pinning tests In-Reply-To: <1402655819-14325-6-git-send-email-dh.herrmann@gmail.com> Message-ID: References: <1402655819-14325-1-git-send-email-dh.herrmann@gmail.com> <1402655819-14325-6-git-send-email-dh.herrmann@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: David Herrmann Cc: linux-kernel@vger.kernel.org, Michael Kerrisk , Ryan Lortie , Linus Torvalds , Andrew Morton , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, Greg Kroah-Hartman , john.stultz@linaro.org, Lennart Poettering , Daniel Mack , Kay Sievers , Hugh Dickins , Tony Battersby , Andy Lutomirski On Fri, 13 Jun 2014, David Herrmann wrote: > Setting SEAL_WRITE is not possible if there're pending GUP users. This > commit adds selftests for memfd+sealing that use FUSE to create pending > page-references. FUSE is very helpful here in that it allows us to delay > direct-IO operations for an arbitrary amount of time. This way, we can > force the kernel to pin pages and then run our normal selftests. > > Signed-off-by: David Herrmann I had a number of problems in getting this working (on openSUSE 13.1): rpm told me I had fuse installed, yet I had to download and install the tarball to get header files needed; then "make fuse_mnt" told me to add -D_FILE_OFFSET_BITS=64 to the compile flags; after which I got "undefined reference to `fuse_main_real'"; but then I tried "make run_fuse" as root, and it seemed to sort these issues out for itself, aside from "./run_fuse_test.sh: Permission denied" - which was within my bounds of comprehension unlike the rest! No complaint, thanks for providing the test (though I didn't check the source to convince myself that "DONE" has done what's claimed): some rainy day someone can get the Makefile working more smoothly, no need to delay the patchset for this. Hugh -- 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