[PATCH 22/23] thp, mm: split huge page on mmap file page

From: Kirill A. Shutemov
Date: Sat Aug 03 2013 - 22:16:45 EST

From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>

We are not ready to mmap file-backed tranparent huge pages. Let's split
them on fault attempt.

Later we'll implement mmap() properly and this code path be used for
fallback cases.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
mm/filemap.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index ed65af5..f7857ef 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1743,6 +1743,8 @@ retry_find:
goto no_cached_page;

+ if (PageTransCompound(page))
+ split_huge_page(compound_trans_head(page));
if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) {
return ret | VM_FAULT_RETRY;

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