The patch titled
Subject: mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range
has been added to the -mm tree. Its filename is
mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
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------------------------------------------------------
From: Shiraz Hashim <shashim@xxxxxxxxxxxxxx>
Subject: mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range
walk_page_range() silently skips vma having VM_PFNMAP set, which leads to
undesirable behaviour at client end (who called walk_page_range). For
example for pagemap_read, when no callbacks are called against VM_PFNMAP
vma, pagemap_read may prepare pagemap data for next virtual address range
at wrong index.
Signed-off-by: Shiraz Hashim <shashim@xxxxxxxxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/pagewalk.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN mm/pagewalk.c~mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range mm/pagewalk.c
--- a/mm/pagewalk.c~mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range
+++ a/mm/pagewalk.c
@@ -199,7 +199,10 @@ int walk_page_range(unsigned long addr,
*/
if ((vma->vm_start <= addr) &&
(vma->vm_flags & VM_PFNMAP)) {
- next = vma->vm_end;
+ if (walk->pte_hole)
+ err = walk->pte_hole(addr, next, walk);
+ if (err)
+ break;
pgd = pgd_offset(walk->mm, next);
continue;
}
_
Patches currently in -mm which might be from shashim@xxxxxxxxxxxxxx are
mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
mm-pagemap-limit-scan-to-virtual-region-being-asked.patch
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