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SubjectRe: [Xen-devel] [PATCH V2 3/7]: PVH: mmu related changes.
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On Fri, 2012-10-12 at 09:57 +0100, Ian Campbell wrote:
> > +int xen_unmap_domain_mfn_range(struct vm_area_struct *vma)
> > +{
> > + int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
> > + struct page **pages = vma ? vma->vm_private_data : NULL;
>
> I thought we agreed to keep uses of vm_private_data in the privcmd
> driver?
>
> I think you should just add pages and nr as direct parameters to this
> function, which is symmetric with the map call.

I had to look at this while rebasing my arm patches, turned out to be
fairly simple. Feel free to either fold in or badger me for a proper
commit message.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 018cbf0..1c5812b 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2655,11 +2655,9 @@ out:
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);

/* Returns: 0 success */
-int xen_unmap_domain_mfn_range(struct vm_area_struct *vma)
+int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
+ struct page **pages, int numpgs)
{
- int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
- struct page **pages = vma ? vma->vm_private_data : NULL;
-
if (!pages || !xen_feature(XENFEAT_auto_translated_physmap))
return 0;

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 641a420..a1ca5ab 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -498,7 +498,7 @@ static void privcmd_close(struct vm_area_struct *vma)
if (!pages || !numpgs || !xen_feature(XENFEAT_auto_translated_physmap))
return;

- xen_unmap_domain_mfn_range(vma);
+ xen_unmap_domain_mfn_range(vma, pages, numpgs);
while (numpgs--)
free_xenballooned_pages(1, &pages[numpgs]);
kfree(pages);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index db3b3b7..dc63e80 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -29,6 +29,7 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
xen_pfn_t mfn, int nr,
pgprot_t prot, unsigned domid,
struct page **pages);
-int xen_unmap_domain_mfn_range(struct vm_area_struct *vma);
+int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
+ struct page **pages, int nr);

#endif /* INCLUDE_XEN_OPS_H */



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