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Subject[PATCH 07/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PTE modifying tests
Date
This uses struct vm_pgtable_debug in PTE modifying tests. The allocated
page is used as set_pte_at() is used there. The tests are skipped if
the allocated page doesn't exist.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
mm/debug_vm_pgtable.c | 71 +++++++++++++++++++++++--------------------
1 file changed, 38 insertions(+), 33 deletions(-)

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 757d2d9c4e93..2b4f0738f266 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -116,10 +116,7 @@ static void __init pte_basic_tests(struct vm_pgtable_debug *debug, int idx)
WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte))));
}

-static void __init pte_advanced_tests(struct mm_struct *mm,
- struct vm_area_struct *vma, pte_t *ptep,
- unsigned long pfn, unsigned long vaddr,
- pgprot_t prot)
+static void __init pte_advanced_tests(struct vm_pgtable_debug *debug)
{
pte_t pte;

@@ -130,33 +127,38 @@ static void __init pte_advanced_tests(struct mm_struct *mm,
*/

pr_debug("Validating PTE advanced\n");
- pte = pfn_pte(pfn, prot);
- set_pte_at(mm, vaddr, ptep, pte);
- ptep_set_wrprotect(mm, vaddr, ptep);
- pte = ptep_get(ptep);
+ if (debug->pte_pfn == ULONG_MAX) {
+ pr_debug("%s: Skipped\n", __func__);
+ return;
+ }
+
+ pte = pfn_pte(debug->pte_pfn, debug->page_prot);
+ set_pte_at(debug->mm, debug->vaddr, debug->ptep, pte);
+ ptep_set_wrprotect(debug->mm, debug->vaddr, debug->ptep);
+ pte = ptep_get(debug->ptep);
WARN_ON(pte_write(pte));
- ptep_get_and_clear(mm, vaddr, ptep);
- pte = ptep_get(ptep);
+ ptep_get_and_clear(debug->mm, debug->vaddr, debug->ptep);
+ pte = ptep_get(debug->ptep);
WARN_ON(!pte_none(pte));

- pte = pfn_pte(pfn, prot);
+ pte = pfn_pte(debug->pte_pfn, debug->page_prot);
pte = pte_wrprotect(pte);
pte = pte_mkclean(pte);
- set_pte_at(mm, vaddr, ptep, pte);
+ set_pte_at(debug->mm, debug->vaddr, debug->ptep, pte);
pte = pte_mkwrite(pte);
pte = pte_mkdirty(pte);
- ptep_set_access_flags(vma, vaddr, ptep, pte, 1);
- pte = ptep_get(ptep);
+ ptep_set_access_flags(debug->vma, debug->vaddr, debug->ptep, pte, 1);
+ pte = ptep_get(debug->ptep);
WARN_ON(!(pte_write(pte) && pte_dirty(pte)));
- ptep_get_and_clear_full(mm, vaddr, ptep, 1);
- pte = ptep_get(ptep);
+ ptep_get_and_clear_full(debug->mm, debug->vaddr, debug->ptep, 1);
+ pte = ptep_get(debug->ptep);
WARN_ON(!pte_none(pte));

- pte = pfn_pte(pfn, prot);
+ pte = pfn_pte(debug->pte_pfn, debug->page_prot);
pte = pte_mkyoung(pte);
- set_pte_at(mm, vaddr, ptep, pte);
- ptep_test_and_clear_young(vma, vaddr, ptep);
- pte = ptep_get(ptep);
+ set_pte_at(debug->mm, debug->vaddr, debug->ptep, pte);
+ ptep_test_and_clear_young(debug->vma, debug->vaddr, debug->ptep);
+ pte = ptep_get(debug->ptep);
WARN_ON(pte_young(pte));
}

@@ -617,20 +619,24 @@ 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 pfn, unsigned long vaddr,
- pgprot_t prot)
+static void __init pte_clear_tests(struct vm_pgtable_debug *debug)
{
- pte_t pte = pfn_pte(pfn, prot);
+ pte_t pte;

pr_debug("Validating PTE clear\n");
+ if (debug->pte_pfn == ULONG_MAX) {
+ pr_debug("%s: Skipped\n", __func__);
+ return;
+ }
+
+ pte = pfn_pte(debug->pte_pfn, debug->page_prot);
#ifndef CONFIG_RISCV
pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
#endif
- set_pte_at(mm, vaddr, ptep, pte);
+ set_pte_at(debug->mm, debug->vaddr, debug->ptep, pte);
barrier();
- pte_clear(mm, vaddr, ptep);
- pte = ptep_get(ptep);
+ pte_clear(debug->mm, debug->vaddr, debug->ptep);
+ pte = ptep_get(debug->ptep);
WARN_ON(!pte_none(pte));
}

@@ -1163,7 +1169,6 @@ static int __init debug_vm_pgtable(void)
p4d_t *p4dp, *saved_p4dp;
pud_t *pudp, *saved_pudp;
pmd_t *pmdp, *saved_pmdp, pmd;
- pte_t *ptep;
pgtable_t saved_ptep;
pgprot_t prot, protnone;
phys_addr_t paddr;
@@ -1293,11 +1298,11 @@ static int __init debug_vm_pgtable(void)
* Page table modifying tests. They need to hold
* proper page table lock.
*/
-
- ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl);
- pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot);
- pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
- pte_unmap_unlock(ptep, ptl);
+ ptl = pte_lockptr(debug.mm, debug.pmdp);
+ spin_lock(ptl);
+ pte_clear_tests(&debug);
+ pte_advanced_tests(&debug);
+ spin_unlock(ptl);

ptl = pmd_lock(mm, pmdp);
pmd_clear_tests(mm, pmdp);
--
2.23.0
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