diff options
Diffstat (limited to 'mm/debug_vm_pgtable.c')
| -rw-r--r-- | mm/debug_vm_pgtable.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index c54177aabebd..ee119e33fef1 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -138,6 +138,9 @@ static void __init pte_advanced_tests(struct pgtable_debug_args *args) return; pr_debug("Validating PTE advanced\n"); + if (WARN_ON(!args->ptep)) + return; + pte = pfn_pte(args->pte_pfn, args->page_prot); set_pte_at(args->mm, args->vaddr, args->ptep, pte); flush_dcache_page(page); @@ -619,6 +622,9 @@ static void __init pte_clear_tests(struct pgtable_debug_args *args) * the unexpected overhead of cache flushing is acceptable. */ pr_debug("Validating PTE clear\n"); + if (WARN_ON(!args->ptep)) + return; + #ifndef CONFIG_RISCV pte = __pte(pte_val(pte) | RANDOM_ORVALUE); #endif @@ -1377,7 +1383,8 @@ static int __init debug_vm_pgtable(void) args.ptep = pte_offset_map_lock(args.mm, args.pmdp, args.vaddr, &ptl); pte_clear_tests(&args); pte_advanced_tests(&args); - pte_unmap_unlock(args.ptep, ptl); + if (args.ptep) + pte_unmap_unlock(args.ptep, ptl); ptl = pmd_lock(args.mm, args.pmdp); pmd_clear_tests(&args); |