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Subject[PATCH, RFC 09/16] thp, mm: handle tail pages in page_cache_get_speculative()
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

For tail page we call __get_page_tail(). It has the same semantics, but
for tail page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/pagemap.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 0e38e13..1da2043 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -149,6 +149,9 @@ static inline int page_cache_get_speculative(struct page *page)
{
VM_BUG_ON(in_interrupt());

+ if (unlikely(PageTail(page)))
+ return __get_page_tail(page);
+
#if !defined(CONFIG_SMP) && defined(CONFIG_TREE_RCU)
# ifdef CONFIG_PREEMPT_COUNT
VM_BUG_ON(!in_atomic());
@@ -175,7 +178,6 @@ static inline int page_cache_get_speculative(struct page *page)
return 0;
}
#endif
- VM_BUG_ON(PageTail(page));

return 1;
}
--
1.7.10.4


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