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mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range

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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 at wrong index.

Change-Id: I057b5c8ede1ae4bb9e3f8639e10bd4fcbf23da7e
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
This commit is contained in:
Shiraz Hashim 2015-01-08 11:50:03 +05:30
parent 9b973c484d
commit 44ad70f1f0
1 changed files with 4 additions and 1 deletions
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5
mm/pagewalk.c
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@ -199,7 +199,10 @@ int walk_page_range(unsigned long addr, unsigned long end,
*/
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;
}