linux-kernel - [PATCH 07/12] mm/debug_vm_pgtable: Use struct vm_pgtable

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Message-Id: <20210706061748.161258-8-gshan@redhat.com>
Date:   Tue,  6 Jul 2021 14:17:43 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, anshuman.khandual@....com,
        catalin.marinas@....com, will@...nel.org,
        akpm@...ux-foundation.org, shan.gavin@...il.com, chuhu@...hat.com
Subject: [PATCH 07/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PTE modifying tests

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@...hat.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