From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hugh Dickins Subject: Re: [PATCH v3 5/7] selftests: add memfd/sealing page-pinning tests Date: Wed, 16 Jul 2014 03:08:31 -0700 (PDT) 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 Return-path: In-Reply-To: <1402655819-14325-6-git-send-email-dh.herrmann@gmail.com> Sender: owner-linux-mm@kvack.org 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 List-Id: linux-api@vger.kernel.org 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