linux-kernel - [PATCH v4 2/3] mm: document locking restrictions for vm_operations

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Message-Id: <20211208212211.2860249-2-surenb@google.com>
Date:   Wed,  8 Dec 2021 13:22:10 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     mhocko@...nel.org, mhocko@...e.com, rientjes@...gle.com,
        willy@...radead.org, hannes@...xchg.org, guro@...com,
        riel@...riel.com, minchan@...nel.org, kirill@...temov.name,
        aarcange@...hat.com, christian@...uner.io, hch@...radead.org,
        oleg@...hat.com, david@...hat.com, jannh@...gle.com,
        shakeelb@...gle.com, luto@...nel.org, christian.brauner@...ntu.com,
        fweimer@...hat.com, jengelh@...i.de, timmurray@...gle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, surenb@...gle.com
Subject: [PATCH v4 2/3] mm: document locking restrictions for vm_operations_struct::close

Add comments for vm_operations_struct::close documenting locking
requirements for this callback and its callers.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/mm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a7e4a9e7d807..b9b88ba7564b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -577,6 +577,10 @@ enum page_entry_size {
  */
 struct vm_operations_struct {
 	void (*open)(struct vm_area_struct * area);
+	/**
+	 * @close: Called when the VMA is being removed from the MM.
+	 * Context: User context.  May sleep.  Caller holds mmap_lock.
+	 */
 	void (*close)(struct vm_area_struct * area);
 	/* Called any time before splitting to check if it's allowed */
 	int (*may_split)(struct vm_area_struct *area, unsigned long addr);
-- 
2.34.1.400.ga245620fadb-goog