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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-15 20:05:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:15 -0700 |
| commit | 887b22c628c615811be3b877e02c9c1fe9d85d6d (patch) | |
| tree | 2a8b8ef999f838cfd979af15cd793323d9beb10f /mm/filemap.c | |
| parent | 198b62f83eef1d605d70eca32759c92cdcc14175 (diff) | |
| download | lwn-887b22c628c615811be3b877e02c9c1fe9d85d6d.tar.gz lwn-887b22c628c615811be3b877e02c9c1fe9d85d6d.zip | |
mm/filemap: fix page cache removal for arbitrary sized THPs
Patch series "Remove assumptions of THP size".
There are a number of places in the VM which assume that a THP is a PMD in
size. That's true today, and remains true after this patch series, but
this is a prerequisite for switching to arbitrary-sized THPs.
thp_nr_pages() still returns either HPAGE_PMD_NR or 1, but will be changed
later.
This patch (of 11):
page_cache_free_page() assumes THPs are PMD_SIZE; fix that assumption.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20200908195539.25896-2-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 3b76d79fd0cf..2937b57329be 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -249,7 +249,7 @@ static void page_cache_free_page(struct address_space *mapping, freepage(page); if (PageTransHuge(page) && !PageHuge(page)) { - page_ref_sub(page, HPAGE_PMD_NR); + page_ref_sub(page, thp_nr_pages(page)); VM_BUG_ON_PAGE(page_count(page) <= 0, page); } else { put_page(page); |