From aaf1f990aee40bc74b425ef8f51201ae21b85ed7 Mon Sep 17 00:00:00 2001 From: Miaohe Lin Date: Thu, 25 Feb 2021 17:17:53 -0800 Subject: [PATCH] mm/rmap: correct some obsolete comments of anon_vma commit 2b575eb64f7a ("mm: convert anon_vma->lock to a mutex") changed spinlock used to serialize access to vma list to mutex. And further, the commit 5a505085f043 ("mm/rmap: Convert the struct anon_vma::mutex to an rwsem") converted the mutex to an rwsem for solving scalability problem. So replace spinlock with rwsem to make comment uptodate. Link: https://lkml.kernel.org/r/20210123072459.25903-1-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/rmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index e26ae119a131..f6f43620cd97 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -168,7 +168,7 @@ static void anon_vma_chain_link(struct vm_area_struct *vma, * * Anon-vma allocations are very subtle, because we may have * optimistically looked up an anon_vma in page_lock_anon_vma_read() - * and that may actually touch the spinlock even in the newly + * and that may actually touch the rwsem even in the newly * allocated vma (it depends on RCU to make sure that the * anon_vma isn't actually destroyed). * @@ -359,7 +359,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma) goto out_error_free_anon_vma; /* - * The root anon_vma's spinlock is the lock actually used when we + * The root anon_vma's rwsem is the lock actually used when we * lock any of the anon_vmas in this anon_vma tree. */ anon_vma->root = pvma->anon_vma->root; -- 2.20.1