linux-kernel - [PATCH v7 3/4] mm: add vma_assert_locked() for !CONFIG_PER_VMA

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Date: Thu, 15 Feb 2024 10:27:55 -0800
From: Lokesh Gidra <lokeshgidra@...gle.com>
To: akpm@...ux-foundation.org
Cc: lokeshgidra@...gle.com, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, selinux@...r.kernel.org, surenb@...gle.com, 
	kernel-team@...roid.com, aarcange@...hat.com, peterx@...hat.com, 
	david@...hat.com, axelrasmussen@...gle.com, bgeffon@...gle.com, 
	willy@...radead.org, jannh@...gle.com, kaleshsingh@...gle.com, 
	ngeoffray@...gle.com, timmurray@...gle.com, rppt@...nel.org, 
	Liam.Howlett@...cle.com, ryan.roberts@....com
Subject: [PATCH v7 3/4] mm: add vma_assert_locked() for !CONFIG_PER_VMA_LOCK

vma_assert_locked() is needed to replace mmap_assert_locked() once we
start using per-vma locks in userfaultfd operations.

In !CONFIG_PER_VMA_LOCK case when mm is locked, it implies that the
given VMA is locked.

Signed-off-by: Lokesh Gidra <lokeshgidra@...gle.com>
---
 include/linux/mm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3c85634b186c..5ece3ad34ef8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -781,6 +781,11 @@ static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
 	return NULL;
 }
 
+static inline void vma_assert_locked(struct vm_area_struct *vma)
+{
+	mmap_assert_locked(vma->vm_mm);
+}
+
 static inline void release_fault_lock(struct vm_fault *vmf)
 {
 	mmap_read_unlock(vmf->vma->vm_mm);
-- 
2.43.0.687.g38aa6559b0-goog