[PATCH v3 13/13] mm/debug_vm_pgtable: populate a pte entry before fetching it
flat view
STALE2225d
From: Aneesh Kumar K.V <hidden>
Date: 2020-08-27 08:06:17
Also in:
linux-arch, linux-mm, linux-s390, linuxppc-dev
Subsystem:
memory management, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Revision v3 of 4 in this series.
Revisions (4)
- v2 [diff vs current]
- v3 current
- v4 [diff vs current]
- v4 [diff vs current]
pte_clear_tests operate on an existing pte entry. Make sure that is not a none pte entry. Signed-off-by: Aneesh Kumar K.V <redacted> --- mm/debug_vm_pgtable.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 21329c7d672f..8527ebb75f2c 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c@@ -546,7 +546,7 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, unsigned long vaddr) { - pte_t pte = ptep_get(ptep); + pte_t pte = ptep_get_and_clear(mm, vaddr, ptep); pr_debug("Validating PTE clear\n"); pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
@@ -944,7 +944,7 @@ 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; + pte_t *ptep, pte; pgtable_t saved_ptep; pgprot_t prot, protnone; phys_addr_t paddr;
@@ -1049,6 +1049,8 @@ static int __init debug_vm_pgtable(void) */ ptep = pte_alloc_map_lock(mm, pmdp, vaddr, &ptl); + pte = pfn_pte(pte_aligned, prot); + set_pte_at(mm, vaddr, ptep, pte); pte_clear_tests(mm, ptep, vaddr); pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); pte_unmap_unlock(ptep, ptl);
--
2.26.2
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