]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/commitdiff
powerpc/hugetlb: Call mm_dec_nr_pmds() in hugetlb_free_pmd_range()
authorScott Wood <scottwood@freescale.com>
Sat, 11 Apr 2015 00:37:34 +0000 (19:37 -0500)
committerScott Wood <scottwood@freescale.com>
Wed, 15 Apr 2015 20:24:22 +0000 (15:24 -0500)
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>
Cc: stable@vger.kernel.org # 4.0.x
arch/powerpc/mm/hugetlbpage.c

index 7e408bfc79482e2c9caff1257f0c8002335aa92c..cecbe00cee2457556587d352efbf6cac4d81e9b2 100644 (file)
@@ -581,6 +581,7 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
        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,