diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-10-15 20:05:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:14 -0700 |
| commit | 401035d5c456691f79fbcc08eb6ee5479c30b606 (patch) | |
| tree | 9d400beaaabc34b41146b3aa4b6ec37c6cbb67dd /mm/debug_vm_pgtable.c | |
| parent | 2b1dd67a78c36a30f993d0d5366177df0cd7a5db (diff) | |
mm/debug_vm_pgtable: avoid none pte in pte_clear_test
pte_clear_tests operate on an existing pte entry. Make sure that is not a
none pte entry.
[aneesh.kumar@linux.ibm.com: avoid kernel crash with riscv]
Link: https://lkml.kernel.org/r/20201015033206.140550-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Link: https://lkml.kernel.org/r/20200902114222.181353-14-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 | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index bfc9c6544adf..9a0a42a4f08d 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -540,12 +540,15 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, #endif /* PAGETABLE_P4D_FOLDED */ static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, - unsigned long vaddr) + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) { - pte_t pte = ptep_get(ptep); + pte_t pte = pfn_pte(pfn, prot); pr_debug("Validating PTE clear\n"); +#ifndef CONFIG_RISCV pte = __pte(pte_val(pte) | RANDOM_ORVALUE); +#endif set_pte_at(mm, vaddr, ptep, pte); barrier(); pte_clear(mm, vaddr, ptep); @@ -996,7 +999,7 @@ static int __init debug_vm_pgtable(void) ptl = pte_lockptr(mm, pmdp); spin_lock(ptl); - pte_clear_tests(mm, ptep, vaddr); + pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot); pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); pte_unmap_unlock(ptep, ptl); |