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xen: gntdev: move use of GNTMAP_contains_pte next to the map_op 

This flag controls the meaning of gnttab_map_grant_ref.host_addr and
specifies that the field contains a reference to the pte entry to be
used to perform the mapping. Therefore move the use of this flag to
the point at which we actually use a reference to the pte instead of
something else, splitting up the usage of the flag in this way is
confusing and potentially error prone.

The other flags are all properties of the mapping itself as opposed to
properties of the hypercall arguments and therefore it make sense to
continue to pass them round in map->flags.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
Cc: Derek G. Murray <Derek.Murray@cl.cam.ac.uk>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell 2010-12-08 11:57:40 +00:00 committed by Konrad Rzeszutek Wilk
parent 448f283193
commit 9329e7604f
1 changed files with 5 additions and 3 deletions
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8
drivers/xen/gntdev.c
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@ -211,10 +211,12 @@ static int find_grant_ptes(pte_t *pte, pgtable_t token,
BUG_ON(pgnr >= map->count);
pte_maddr = (u64)pfn_to_mfn(page_to_pfn(token)) << PAGE_SHIFT;
pte_maddr += (unsigned long)pte & ~PAGE_MASK;
gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr, map->flags,
gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr,
GNTMAP_contains_pte | map->flags,
map->grants[pgnr].ref,
map->grants[pgnr].domid);
gnttab_set_unmap_op(&map->unmap_ops[pgnr], pte_maddr, map->flags,
gnttab_set_unmap_op(&map->unmap_ops[pgnr], pte_maddr,
GNTMAP_contains_pte | map->flags,
0 /* handle */);
return 0;
}
@ -569,7 +571,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
vma->vm_private_data = map;
map->vma = vma;
map->flags = GNTMAP_host_map | GNTMAP_application_map | GNTMAP_contains_pte;
map->flags = GNTMAP_host_map | GNTMAP_application_map;
if (!(vma->vm_flags & VM_WRITE))
map->flags |= GNTMAP_readonly;