Commit 5291c09b authored by Yanfei Xu's avatar Yanfei Xu Committed by Linus Torvalds
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mm/hugetlb: remove redundant check in preparing and destroying gigantic page 

Gigantic page is a compound page and its order is more than 1.  Thus it
must be available for hpage_pincount.  Let's remove the redundant check
for gigantic page.

Link: https://lkml.kernel.org/r/20210202112002.73170-1-yanfei.xu@windriver.com


Signed-off-by: default avatarYanfei Xu <yanfei.xu@windriver.com>
Reviewed-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6c26d310

mm/hugetlb.c

+2 −5
Original line number Diff line number Diff line
@@ -1234,7 +1234,6 @@ static void destroy_compound_gigantic_page(struct page *page, 
	struct page *p = page + 1;



	atomic_set(compound_mapcount_ptr(page), 0);

	if (hpage_pincount_available(page))

	atomic_set(compound_pincount_ptr(page), 0);



	for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
@@ -1563,8 +1562,6 @@ static void prep_compound_gigantic_page(struct page *page, unsigned int order) 
		set_compound_head(p, page);

	}

	atomic_set(compound_mapcount_ptr(page), -1);



	if (hpage_pincount_available(page))

	atomic_set(compound_pincount_ptr(page), 0);

}