Messages in this thread | | | Date | Tue, 3 Apr 2012 17:25:58 +0100 | From | Stefano Stabellini <> | Subject | Re: [PATCH] xen/gntdev: do not set VM_PFNMAP |
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On Tue, 3 Apr 2012, Konrad Rzeszutek Wilk wrote: > On Tue, Apr 03, 2012 at 12:25:02PM +0100, Stefano Stabellini wrote: > > Since when we are using the m2p_override it is not true anymore that the > ^^^^ - get rid of that. > > mmap'ed area doesn't have corresponsing struct pages. > > That reads to me as !!do struct page. Which comes out as: > > "m2p_override_* API the mmap-ed are have corresponding struct pages' ?
Yes, indeed: m2p_override_* provides the corresponding struct pages
> > Removing the VM_PFNMAP flag makes get_user_pages work on the mmap'ed user vma. > > An example test case would be using a Xen userspace block backend > > (QDISK) on a file on NFS using O_DIRECT. > > > > The patch should be backported back to 2.6.38. > > Add CC: stable@kernel.org then.
I'll resend CCing stable
> But does this patch depend on other > patches?
only on the m2p_override, that is in Linux since 2.6.38
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