| From | "Kirill A. Shutemov" <> | Subject | [PATCH 10/23] thp, mm: warn if we try to use replace_page_cache_page() with THP | Date | Sun, 4 Aug 2013 05:17:12 +0300 |
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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
replace_page_cache_page() is only used by FUSE. It's unlikely that we will support THP in FUSE page cache any soon.
Let's pospone implemetation of THP handling in replace_page_cache_page() until any will use it. -EINVAL and WARN_ONCE() for now.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- mm/filemap.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c index b75bdf5..28f4927 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -418,6 +418,10 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask) { int error; + if (WARN_ONCE(PageTransHuge(old) || PageTransHuge(new), + "unexpected transhuge page\n")) + return -EINVAL; + VM_BUG_ON(!PageLocked(old)); VM_BUG_ON(!PageLocked(new)); VM_BUG_ON(new->mapping); -- 1.8.3.2
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