From d4af73e3f8d09b0417ba45082f289fc38bd3a970 Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Wed, 1 Apr 2020 21:11:48 -0700 Subject: [PATCH] mm/hugetlb: remove unnecessary memory fetch in PageHeadHuge() Commit f1e61557f023 ("mm: pack compound_dtor and compound_order into one word in struct page") changed compound_dtor from a pointer to an array index in order to pack it. To check if page has the hugeltbfs compound_dtor, we can just compare the index directly without fetching the function pointer. Said commit did that with PageHuge() and we can do the same with PageHeadHuge() to make the code a bit smaller and faster. Signed-off-by: Vlastimil Babka Signed-off-by: Andrew Morton Reviewed-by: Mike Kravetz Acked-by: David Rientjes Acked-by: Kirill A. Shutemov Cc: Neha Agarwal Link: http://lkml.kernel.org/r/20200311172440.6988-1-vbabka@suse.cz Signed-off-by: Linus Torvalds --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 4b84640fedf4..f9ea1e5197b4 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1528,7 +1528,7 @@ int PageHeadHuge(struct page *page_head) if (!PageHead(page_head)) return 0; - return get_compound_page_dtor(page_head) == free_huge_page; + return page_head[1].compound_dtor == HUGETLB_PAGE_DTOR; } /*