From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
We don't actually care about the contents of the PUD, just set the bits
to indicate presence and return.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
mm/mincore.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/mm/mincore.c b/mm/mincore.c
index 2a565ed..8e6ce12 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -108,6 +108,18 @@ static int mincore_unmapped_range(unsigned long addr, unsigned long end,
return 0;
}
+static int mincore_pud_range(pud_t *pud, unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
+{
+ unsigned char *vec = walk->private;
+ int nr = (end - addr) >> PAGE_SHIFT;
+
+ memset(vec, 1, nr);
+ walk->private += nr;
+
+ return 0;
+}
+
static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
@@ -176,6 +188,7 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
unsigned long end;
int err;
struct mm_walk mincore_walk = {
+ .pud_entry = mincore_pud_range,
.pmd_entry = mincore_pte_range,
.pte_hole = mincore_unmapped_range,
.hugetlb_entry = mincore_hugetlb,
--
2.6.2
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