From f445884562dd8bc51eb4136bd21f014403d1813d Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 11 Jul 2019 20:54:59 -0700
Subject: include/linux/pagemap.h: document trylock_page() return value

Cc: Henry Burns <henryburns@google.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Xidong Wang <wangxidong_97@163.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/pagemap.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index fe0b29bf2df7..6fd0d3aa492c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -452,6 +452,9 @@ extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
 				unsigned int flags);
 extern void unlock_page(struct page *page);
 
+/*
+ * Return true if the page was successfully locked
+ */
 static inline int trylock_page(struct page *page)
 {
 	page = compound_head(page);
-- 
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