linux-kernel - [PATCH v8 11/15] khugepaged: allow madvise_collapse to check all anonymous mTHP orders

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Message-ID: <20250702055742.102808-12-npache@redhat.com>
Date: Tue,  1 Jul 2025 23:57:38 -0600
From: Nico Pache <npache@...hat.com>
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Subject: [PATCH v8 11/15] khugepaged: allow madvise_collapse to check all anonymous mTHP orders

Allow madvise_collapse to scan/collapse all mTHP orders without the
strict requirement of needing the PMD-order enabled.

Signed-off-by: Nico Pache <npache@...hat.com>
---
 mm/khugepaged.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index b96a7327b9c0..6ea681b81647 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2930,11 +2930,13 @@ int madvise_collapse(struct vm_area_struct *vma, unsigned long start,
 	unsigned long hstart, hend, addr;
 	int thps = 0, last_fail = SCAN_FAIL;
 	bool mmap_locked = true;
+	unsigned long orders = vma_is_anonymous(vma) ?
+					THP_ORDERS_ALL_ANON : BIT(PMD_ORDER);
 
 	BUG_ON(vma->vm_start > start);
 	BUG_ON(vma->vm_end < end);
 
-	if (!thp_vma_allowable_order(vma, vma->vm_flags, 0, PMD_ORDER))
+	if (!thp_vma_allowable_orders(vma, vma->vm_flags, 0, orders))
 		return -EINVAL;
 
 	cc = kmalloc(sizeof(*cc), GFP_KERNEL);
@@ -2956,7 +2958,7 @@ int madvise_collapse(struct vm_area_struct *vma, unsigned long start,
 			mmap_read_lock(mm);
 			mmap_locked = true;
 			result = hugepage_vma_revalidate(mm, addr, false, &vma,
-							 cc, BIT(HPAGE_PMD_ORDER));
+							 cc, orders);
 			if (result  != SCAN_SUCCEED) {
 				last_fail = result;
 				goto out_nolock;
-- 
2.49.0