linux-kernel - [PATCH v7 11/18] mm: Add missing mmu_notifier_clear_young for !MMU

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Message-ID: <20240926013506.860253-12-jthoughton@google.com>
Date: Thu, 26 Sep 2024 01:34:59 +0000
From: James Houghton <jthoughton@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, David Matlack <dmatlack@...gle.com>, 
	David Rientjes <rientjes@...gle.com>, James Houghton <jthoughton@...gle.com>, 
	Jason Gunthorpe <jgg@...pe.ca>, Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Wei Xu <weixugc@...gle.com>, Yu Zhao <yuzhao@...gle.com>, 
	Axel Rasmussen <axelrasmussen@...gle.com>, kvm@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	Jason Gunthorpe <jgg@...dia.com>, David Hildenbrand <david@...hat.com>
Subject: [PATCH v7 11/18] mm: Add missing mmu_notifier_clear_young for !MMU_NOTIFIER

Remove the now unnecessary ifdef in mm/damon/vaddr.c as well.

Signed-off-by: James Houghton <jthoughton@...gle.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Acked-by: David Hildenbrand <david@...hat.com>
---
 include/linux/mmu_notifier.h | 7 +++++++
 mm/damon/vaddr.c             | 2 --
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index d39ebb10caeb..e2dd57ca368b 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -606,6 +606,13 @@ static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
 	return 0;
 }
 
+static inline int mmu_notifier_clear_young(struct mm_struct *mm,
+					   unsigned long start,
+					   unsigned long end)
+{
+	return 0;
+}
+
 static inline int mmu_notifier_test_young(struct mm_struct *mm,
 					  unsigned long address)
 {
diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 58829baf8b5d..2d5b53253bc2 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -351,11 +351,9 @@ static void damon_hugetlb_mkold(pte_t *pte, struct mm_struct *mm,
 		set_huge_pte_at(mm, addr, pte, entry, psize);
 	}
 
-#ifdef CONFIG_MMU_NOTIFIER
 	if (mmu_notifier_clear_young(mm, addr,
 				     addr + huge_page_size(hstate_vma(vma))))
 		referenced = true;
-#endif /* CONFIG_MMU_NOTIFIER */
 
 	if (referenced)
 		folio_set_young(folio);
-- 
2.46.0.792.g87dc391469-goog