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mm/page_ref: introduce page_ref_inc_return

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Let's introduce that helper.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-06-20 12:09:41 +02:00 committed by Christian Borntraeger
parent 3d84683bd7
commit df9b2b4a4a
1 changed files with 9 additions and 0 deletions
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9
include/linux/page_ref.h
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@ -124,6 +124,15 @@ static inline int page_ref_sub_and_test(struct page *page, int nr)
return ret;
}
static inline int page_ref_inc_return(struct page *page)
{
int ret = atomic_inc_return(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
__page_ref_mod_and_return(page, 1, ret);
return ret;
}
static inline int page_ref_dec_and_test(struct page *page)
{
int ret = atomic_dec_and_test(&page->_refcount);