From b6adf494d78314b61381c7093d713eee50dd2694 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Fri, 12 Apr 2024 09:47:53 -0400 Subject: [PATCH] mm: Assert the mmap_lock is held in __anon_vma_prepare() Convert the comment into an assertion. Signed-off-by: Matthew Wilcox (Oracle) --- mm/rmap.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 3746a55310183..869cb77f67ad1 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); -- 2.49.0