linux-kernel - [PATCH 2/6] mm: for !CONFIG_PER_VMA_LOCK equate write lock assertion for vma and mmap

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Message-ID: <20230731171233.1098105-3-surenb@google.com>
Date:   Mon, 31 Jul 2023 10:12:28 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     torvalds@...ux-foundation.org, jannh@...gle.com,
        willy@...radead.org, liam.howlett@...cle.com, david@...hat.com,
        peterx@...hat.com, ldufour@...ux.ibm.com, vbabka@...e.cz,
        michel@...pinasse.org, jglisse@...gle.com, mhocko@...e.com,
        hannes@...xchg.org, dave@...olabs.net, hughd@...gle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org, Suren Baghdasaryan <surenb@...gle.com>
Subject: [PATCH 2/6] mm: for !CONFIG_PER_VMA_LOCK equate write lock assertion
 for vma and mmap

When CONFIG_PER_VMA_LOCK=n, vma_assert_write_locked() should be equivalent
to mmap_assert_write_locked().

Suggested-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/mm.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 406ab9ea818f..262b5f44101d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -750,7 +750,8 @@ static inline void vma_end_read(struct vm_area_struct *vma) {}
 static inline void vma_start_write(struct vm_area_struct *vma) {}
 static inline bool vma_try_start_write(struct vm_area_struct *vma)
 		{ return true; }
-static inline void vma_assert_write_locked(struct vm_area_struct *vma) {}
+static inline void vma_assert_write_locked(struct vm_area_struct *vma)
+		{ mmap_assert_write_locked(vma->vm_mm); }
 static inline void vma_mark_detached(struct vm_area_struct *vma,
 				     bool detached) {}
 
-- 
2.41.0.487.g6d72f3e995-goog