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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>
This commit is contained in:
Andrew Morton 2019-07-11 20:54:59 -07:00 committed by Linus Torvalds
parent 98ef2046f2
commit f445884562
1 changed files with 3 additions and 0 deletions
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include/linux/pagemap.h
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@ -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);