Hi Kirill,
On 03/15/2013 01:50 AM, Kirill A. Shutemov wrote:
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
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 3521b0d..408c4e3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -159,6 +159,9 @@ static inline int page_cache_get_speculative(struct page *page)
What's the different between page_cache_get_speculative and page_cache_get?
{
VM_BUG_ON(in_interrupt());
+ if (unlikely(PageTail(page)))
+ return __get_page_tail(page);
+
#ifdef CONFIG_TINY_RCU
# ifdef CONFIG_PREEMPT_COUNT
VM_BUG_ON(!in_atomic());
@@ -185,7 +188,6 @@ static inline int page_cache_get_speculative(struct page *page)
return 0;
}
#endif
- VM_BUG_ON(PageTail(page));
return 1;
}
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