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mm/hugetlb: remove unnecessary memory fetch in PageHeadHuge() 

Commit f1e61557f0 ("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 <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Neha Agarwal <nehaagarwal@google.com>
Link: http://lkml.kernel.org/r/20200311172440.6988-1-vbabka@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka 2020-04-01 21:11:48 -07:00 committed by Linus Torvalds
parent 353b2de42e
commit d4af73e3f8
1 changed files with 1 additions and 1 deletions
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2
mm/hugetlb.c
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@ -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;
}
/*