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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-10-15 20:04:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:14 -0700 |
| commit | 13af05063033238777e4f155eeffe7c06be2a96c (patch) | |
| tree | 6b8106d5f22de298431559f05122246d606a77f9 /mm/debug_vm_pgtable.c | |
| parent | 87f34986de0b3799efb1a5eaaa9baa790047f839 (diff) | |
| download | linux-13af05063033238777e4f155eeffe7c06be2a96c.tar.gz | |
mm/debug_vm_pgtable/pmd_clear: don't use pmd/pud_clear on pte entries
pmd_clear() should not be used to clear pmd level pte entries. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Michael Ellerman <mpe@ellerman.id.au> Link: https://lkml.kernel.org/r/20200902114222.181353-12-aneesh.kumar@linux.ibm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/debug_vm_pgtable.c')
| -rw-r--r-- | mm/debug_vm_pgtable.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index cbf6e0019f62..2cc299308d10 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -196,6 +196,8 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmd = READ_ONCE(*pmdp); WARN_ON(pmd_young(pmd)); + /* Clear the pte entries */ + pmdp_huge_get_and_clear(mm, vaddr, pmdp); pgtable = pgtable_trans_huge_withdraw(mm, pmdp); } @@ -317,6 +319,8 @@ static void __init pud_advanced_tests(struct mm_struct *mm, pudp_test_and_clear_young(vma, vaddr, pudp); pud = READ_ONCE(*pudp); WARN_ON(pud_young(pud)); + + pudp_huge_get_and_clear(mm, vaddr, pudp); } static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) @@ -440,8 +444,6 @@ static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, * This entry points to next level page table page. * Hence this must not qualify as pud_bad(). */ - pmd_clear(pmdp); - pud_clear(pudp); pud_populate(mm, pudp, pmdp); pud = READ_ONCE(*pudp); WARN_ON(pud_bad(pud)); @@ -573,7 +575,6 @@ static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, * This entry points to next level page table page. * Hence this must not qualify as pmd_bad(). */ - pmd_clear(pmdp); pmd_populate(mm, pmdp, pgtable); pmd = READ_ONCE(*pmdp); WARN_ON(pmd_bad(pmd)); |