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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-12-13 01:43:17 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-13 03:55:08 +0100 |
| commit | c70b647d381cba1899c953b0016b7dc185892f90 (patch) | |
| tree | 69e6fe37d37e0db4297f9e08d7b48ec38ed6b3cb /mm/filemap.c | |
| parent | mm: cma: make linux/cma.h standalone includible (diff) | |
| download | linux-c70b647d381cba1899c953b0016b7dc185892f90.tar.xz linux-c70b647d381cba1899c953b0016b7dc185892f90.zip | |
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>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 50b52fe51937..caa779f8797f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -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); |