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mm/filemap.c: add comment for confusing logic in page_cache_tree_insert() 

Unlike THP, hugetlb pages are represented by one entry in the
radix-tree.

[akpm@linux-foundation.org: tweak comment]
Link: http://lkml.kernel.org/r/20161110163640.126124-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2016-12-12 16:43:17 -08:00 committed by Linus Torvalds
parent d5e6eff265
commit c70b647d38
1 changed files with 4 additions and 1 deletions
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5
mm/filemap.c
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@ -169,7 +169,10 @@ static int page_cache_tree_insert(struct address_space *mapping,
static void page_cache_tree_delete(struct address_space *mapping,
struct page *page, void *shadow)
{
int i, nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
int i, nr;
/* hugetlb pages are represented by one entry in the radix tree */
nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageTail(page), page);