From b42f0e90ed0b4117139cf66de2d6f83e3d8bcf8d Mon Sep 17 00:00:00 2001
From: Zi Yan <ziy@nvidia.com>
Date: Thu, 8 Aug 2024 10:18:42 -0400
Subject: [PATCH] fixup! mm/numa: no task_numa_fault() call if page table is
 changed

---
 mm/huge_memory.c | 18 +++++++-----------
 mm/memory.c      | 19 ++++++++-----------
 2 files changed, 15 insertions(+), 22 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a3c018f2b554..4e4364a17e6d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1681,7 +1681,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
 	vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
 	if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) {
 		spin_unlock(vmf->ptl);
-		goto out;
+		return 0;
 	}
 
 	pmd = pmd_modify(oldpmd, vma->vm_page_prot);
@@ -1724,23 +1724,16 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
 	if (!migrate_misplaced_folio(folio, vma, target_nid)) {
 		flags |= TNF_MIGRATED;
 		nid = target_nid;
+		goto out;
 	} else {
 		flags |= TNF_MIGRATE_FAIL;
 		vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
 		if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) {
 			spin_unlock(vmf->ptl);
-			goto out;
+			return 0;
 		}
-		goto out_map;
 	}
 
-count_fault:
-	if (nid != NUMA_NO_NODE)
-		task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags);
-
-out:
-	return 0;
-
 out_map:
 	/* Restore the PMD */
 	pmd = pmd_modify(oldpmd, vma->vm_page_prot);
@@ -1750,7 +1743,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
 	set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd);
 	update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
 	spin_unlock(vmf->ptl);
-	goto count_fault;
+out:
+	if (nid != NUMA_NO_NODE)
+		task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags);
+	return 0;
 }
 
 /*
diff --git a/mm/memory.c b/mm/memory.c
index 503d493263df..d9b1dff9dc57 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5461,7 +5461,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
 
 	if (unlikely(!pte_same(old_pte, vmf->orig_pte))) {
 		pte_unmap_unlock(vmf->pte, vmf->ptl);
-		goto out;
+		return 0;
 	}
 
 	pte = pte_modify(old_pte, vma->vm_page_prot);
@@ -5523,24 +5523,18 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
 	if (!migrate_misplaced_folio(folio, vma, target_nid)) {
 		nid = target_nid;
 		flags |= TNF_MIGRATED;
+		goto out;
 	} else {
 		flags |= TNF_MIGRATE_FAIL;
 		vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
 					       vmf->address, &vmf->ptl);
 		if (unlikely(!vmf->pte))
-			goto out;
+			return 0;
 		if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) {
 			pte_unmap_unlock(vmf->pte, vmf->ptl);
-			goto out;
+			return 0;
 		}
-		goto out_map;
 	}
-
-count_fault:
-	if (nid != NUMA_NO_NODE)
-		task_numa_fault(last_cpupid, nid, nr_pages, flags);
-out:
-	return 0;
 out_map:
 	/*
 	 * Make it present again, depending on how arch implements
@@ -5553,7 +5547,10 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
 		numa_rebuild_single_mapping(vmf, vma, vmf->address, vmf->pte,
 					    writable);
 	pte_unmap_unlock(vmf->pte, vmf->ptl);
-	goto count_fault;
+out:
+	if (nid != NUMA_NO_NODE)
+		task_numa_fault(last_cpupid, nid, nr_pages, flags);
+	return 0;
 }
 
 static inline vm_fault_t create_huge_pmd(struct vm_fault *vmf)
-- 
2.43.0