| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.0 025/220] powerpc/hugetlb: Call mm_dec_nr_pmds() in hugetlb_free_pmd_range() | Date | Sat, 2 May 2015 20:59:00 +0200 |
| |
4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Scott Wood <scottwood@freescale.com>
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@freescale.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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,
|