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include/linux/pagemap.h: optimise find_subpage for !THP 

If THP is disabled, find_subpage() can become a no-op by using
hpage_nr_pages() instead of compound_nr().  hpage_nr_pages() embeds a
check for PageTail, so we can drop the check here.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Link: http://lkml.kernel.org/r/20200318140253.6141-5-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-04-06 20:04:31 -07:00 committed by Linus Torvalds
parent 85b9f46e8e
commit a0650604a7
1 changed files with 1 additions and 3 deletions
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4
include/linux/pagemap.h
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@ -341,9 +341,7 @@ static inline struct page *find_subpage(struct page *head, pgoff_t index)
if (PageHuge(head))
return head;
VM_BUG_ON_PAGE(PageTail(head), head);
return head + (index & (compound_nr(head) - 1));
return head + (index & (hpage_nr_pages(head) - 1));
}
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);