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Subject[PATCH 10/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PGD and P4D modifying tests
Date
This uses struct vm_pgtable_debug in PGD/P4D modifying tests. No
allocated huge page is used in these tests.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
mm/debug_vm_pgtable.c | 76 +++++++++++++++++++------------------------
1 file changed, 34 insertions(+), 42 deletions(-)

diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 59fd9440ab12..7bc26808033c 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -520,27 +520,26 @@ static void __init pud_populate_tests(struct vm_pgtable_debug *debug) { }
#endif /* PAGETABLE_PUD_FOLDED */

#ifndef __PAGETABLE_P4D_FOLDED
-static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp)
+static void __init p4d_clear_tests(struct vm_pgtable_debug *debug)
{
- p4d_t p4d = READ_ONCE(*p4dp);
+ p4d_t p4d = READ_ONCE(*(debug->p4dp));

- if (mm_pud_folded(mm))
+ if (mm_pud_folded(debug->mm))
return;

pr_debug("Validating P4D clear\n");
p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE);
- WRITE_ONCE(*p4dp, p4d);
- p4d_clear(p4dp);
- p4d = READ_ONCE(*p4dp);
+ WRITE_ONCE(*(debug->p4dp), p4d);
+ p4d_clear(debug->p4dp);
+ p4d = READ_ONCE(*(debug->p4dp));
WARN_ON(!p4d_none(p4d));
}

-static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
- pud_t *pudp)
+static void __init p4d_populate_tests(struct vm_pgtable_debug *debug)
{
p4d_t p4d;

- if (mm_pud_folded(mm))
+ if (mm_pud_folded(debug->mm))
return;

pr_debug("Validating P4D populate\n");
@@ -548,34 +547,33 @@ static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
* This entry points to next level page table page.
* Hence this must not qualify as p4d_bad().
*/
- pud_clear(pudp);
- p4d_clear(p4dp);
- p4d_populate(mm, p4dp, pudp);
- p4d = READ_ONCE(*p4dp);
+ pud_clear(debug->pudp);
+ p4d_clear(debug->p4dp);
+ p4d_populate(debug->mm, debug->p4dp, debug->start_pudp);
+ p4d = READ_ONCE(*(debug->p4dp));
WARN_ON(p4d_bad(p4d));
}

-static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp)
+static void __init pgd_clear_tests(struct vm_pgtable_debug *debug)
{
- pgd_t pgd = READ_ONCE(*pgdp);
+ pgd_t pgd = READ_ONCE(*(debug->pgdp));

- if (mm_p4d_folded(mm))
+ if (mm_p4d_folded(debug->mm))
return;

pr_debug("Validating PGD clear\n");
pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE);
- WRITE_ONCE(*pgdp, pgd);
- pgd_clear(pgdp);
- pgd = READ_ONCE(*pgdp);
+ WRITE_ONCE(*(debug->pgdp), pgd);
+ pgd_clear(debug->pgdp);
+ pgd = READ_ONCE(*(debug->pgdp));
WARN_ON(!pgd_none(pgd));
}

-static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
- p4d_t *p4dp)
+static void __init pgd_populate_tests(struct vm_pgtable_debug *debug)
{
pgd_t pgd;

- if (mm_p4d_folded(mm))
+ if (mm_p4d_folded(debug->mm))
return;

pr_debug("Validating PGD populate\n");
@@ -583,23 +581,17 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
* This entry points to next level page table page.
* Hence this must not qualify as pgd_bad().
*/
- p4d_clear(p4dp);
- pgd_clear(pgdp);
- pgd_populate(mm, pgdp, p4dp);
- pgd = READ_ONCE(*pgdp);
+ p4d_clear(debug->p4dp);
+ pgd_clear(debug->pgdp);
+ pgd_populate(debug->mm, debug->pgdp, debug->start_p4dp);
+ pgd = READ_ONCE(*(debug->pgdp));
WARN_ON(pgd_bad(pgd));
}
#else /* !__PAGETABLE_P4D_FOLDED */
-static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { }
-static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { }
-static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
- pud_t *pudp)
-{
-}
-static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
- p4d_t *p4dp)
-{
-}
+static void __init p4d_clear_tests(struct vm_pgtable_debug *debug) { }
+static void __init pgd_clear_tests(struct vm_pgtable_debug *debug) { }
+static void __init p4d_populate_tests(struct vm_pgtable_debug *debug) { }
+static void __init pgd_populate_tests(struct vm_pgtable_debug *debug) { }
#endif /* PAGETABLE_P4D_FOLDED */

static void __init pte_clear_tests(struct vm_pgtable_debug *debug)
@@ -1300,12 +1292,12 @@ static int __init debug_vm_pgtable(void)
pud_populate_tests(&debug);
spin_unlock(ptl);

- spin_lock(&mm->page_table_lock);
- p4d_clear_tests(mm, p4dp);
- pgd_clear_tests(mm, pgdp);
- p4d_populate_tests(mm, p4dp, saved_pudp);
- pgd_populate_tests(mm, pgdp, saved_p4dp);
- spin_unlock(&mm->page_table_lock);
+ spin_lock(&(debug.mm->page_table_lock));
+ p4d_clear_tests(&debug);
+ pgd_clear_tests(&debug);
+ p4d_populate_tests(&debug);
+ pgd_populate_tests(&debug);
+ spin_unlock(&(debug.mm->page_table_lock));

p4d_free(mm, saved_p4dp);
pud_free(mm, saved_pudp);
--
2.23.0
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