[PATCH 10 of 11] export zap_page_range for XPMEM

[Andrea Arcangeli <andrea@xxxxxxxxxxxx>]

# HG changeset patch
# User Andrea Arcangeli <andrea@xxxxxxxxxxxx>
# Date 1209740229 -7200
# Node ID 4f462fb3dff614cd7d971219c3feaef0b43359c1
# Parent  721c3787cd42043734331e54a42eb20c51766f71
export zap_page_range for XPMEM

XPMEM would have used sys_madvise() except that madvise_dontneed()
returns an -EINVAL if VM_PFNMAP is set, which is always true for the pages
XPMEM imports from other partitions and is also true for uncached pages
allocated locally via the mspec allocator.  XPMEM needs zap_page_range()
functionality for these types of pages as well as 'normal' pages.

Signed-off-by: Dean Nelson <dcn@xxxxxxx>
Signed-off-by: Andrea Arcangeli <andrea@xxxxxxxxxxxx>

diff --git a/mm/memory.c b/mm/memory.c
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -954,6 +954,7 @@ unsigned long zap_page_range(struct vm_a
 
 	return unmap_vmas(vma, address, end, &nr_accounted, details);
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
 
 /*
  * Do a quick page-table lookup for a single page.

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