header: add page_is_pfmemalloc()
This adds page_is_pfmemalloc() which is used by the igb driver.
The direct access to page->pfmemalloc was replaced by this function
call in 54d985ce23 upstream commit.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
parent
4beaba31
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