4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Scott Wood <scottwood@xxxxxxxxxxxxx>
commit 50c6a665b383cb5839e45d04e36faeeefaffa052 upstream.
Commit dc6c9a35b66b5 ("mm: account pmd page tables to the process")
added a counter that is incremented whenever a PMD is allocated and
decremented whenever a PMD is freed. For hugepages on PPC, common code
is used to allocated PMDs, but arch-specific code is used to free PMDs.
This results in kernel output such as "BUG: non-zero nr_pmds on freeing
mm: 1" when using hugepages.
Update the PPC hugepage PMD freeing code to decrement the count, just
as the above commit did for free_pmd_range().
Fixes: dc6c9a35b66b5 ("mm: account pmd page tables to the process")
Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/hugetlbpage.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -581,6 +581,7 @@ static void hugetlb_free_pmd_range(struc
pmd = pmd_offset(pud, start);
pud_clear(pud);
pmd_free_tlb(tlb, pmd, start);
+ mm_dec_nr_pmds(tlb->mm);
}
static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
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