Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751299AbWI3RAU (ORCPT ); Sat, 30 Sep 2006 13:00:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750827AbWI3RAU (ORCPT ); Sat, 30 Sep 2006 13:00:20 -0400 Received: from mail-gw1.sa.eol.hu ([212.108.200.67]:20891 "EHLO mail-gw1.sa.eol.hu") by vger.kernel.org with ESMTP id S1751301AbWI3RAT (ORCPT ); Sat, 30 Sep 2006 13:00:19 -0400 To: rmk@arm.linux.org.uk CC: dhylands@gmail.com, guinan@bluebutton.com, linux-kernel@vger.kernel.org Subject: get_user_pages() cache issues on ARM Message-Id: From: Miklos Szeredi Date: Sat, 30 Sep 2006 18:59:50 +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1878 Lines: 58 Hi Russell, The get_user_pages() vs dcache coherency issue still seems to be unresolved on ARM. See flush_anon_page() and flush_kernel_dcache_page() in Documentation/cachetlb.txt and their implementation on PARISC. Can you please take a look at this? Thanks, Miklos ------- Start of forwarded message ------- Date: Sun, 24 Sep 2006 20:20:15 -0700 From: "Dave Hylands" To: "Miklos Szeredi" Subject: Re: [fuse-devel] ARM cross build issues Cc: guinan@bluebutton.com, fuse-devel@lists.sourceforge.net In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi Miklos, Sending this to the list... > > 2.6.18 still calls get_user_pages will the NULL vma. I verified that > > the flush_cache_all patch made things work for me under 2.6.11 > > (big-endian ARM) and 2.6.17 (little-endian ARM). > > get_user_pages() should do the right thing on it's own. So passing > NULL vma is the normal thing to do, and the workaround should not be > needed. > > So if 2.6.18 works without the patch, then it's fixed, otherwise not. So 2.6.18 does NOT work on the ARM using the fuse.ko that gets built from the kernel sources. If I add the flush_cache_all() patch or the DCAHCE_BUG patch, then everything works fine. This was tested on my gumstix, which is an ARM XScale PXA255 running in little-endian mode, using 2.6.18. I was using the hello filesystem for the tests. - -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ ------- End of forwarded message ------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/