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>
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@ -452,6 +452,9 @@ extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
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unsigned int flags);
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unsigned int flags);
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extern void unlock_page(struct page *page);
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extern void unlock_page(struct page *page);
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/*
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* Return true if the page was successfully locked
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*/
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static inline int trylock_page(struct page *page)
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static inline int trylock_page(struct page *page)
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{
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{
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page = compound_head(page);
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page = compound_head(page);
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