Messages in this thread Patch in this message | | | From | "Matthew Wilcox (Oracle)" <> | Subject | [PATCH 1/4] mm: Assert the mmap_lock is held in __anon_vma_prepare() | Date | Fri, 26 Apr 2024 15:45:00 +0100 |
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Convert the comment into an assertion.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- mm/rmap.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/rmap.c b/mm/rmap.c index 2608c40dffad..619d4d65d99b 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -182,8 +182,6 @@ static void anon_vma_chain_link(struct vm_area_struct *vma, * for the new allocation. At the same time, we do not want * to do any locking for the common case of already having * an anon_vma. - * - * This must be called with the mmap_lock held for reading. */ int __anon_vma_prepare(struct vm_area_struct *vma) { @@ -191,6 +189,7 @@ int __anon_vma_prepare(struct vm_area_struct *vma) struct anon_vma *anon_vma, *allocated; struct anon_vma_chain *avc; + mmap_assert_locked(mm); might_sleep(); avc = anon_vma_chain_alloc(GFP_KERNEL); -- 2.43.0
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