Messages in this thread | | | Subject | get_user_pages() cache issues on ARM | From | Miklos Szeredi <> | Date | Sat, 30 Sep 2006 18:59:50 +0200 |
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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" <dhylands@gmail.com> To: "Miklos Szeredi" <miklos@szeredi.hu> Subject: Re: [fuse-devel] ARM cross build issues Cc: guinan@bluebutton.com, fuse-devel@lists.sourceforge.net In-Reply-To: <E1GR461-0003WJ-00@dorka.pomaz.szeredi.hu> 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/
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