[PATCHv6 11/22] thp, mm: warn if we try to use replace_page_cache_page() with THP
From: Kirill A. Shutemov <hidden>
Date: 2013-09-23 12:06:09
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Linus Torvalds
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 <redacted> --- mm/filemap.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/mm/filemap.c b/mm/filemap.c
index 60478ebeda..3421bcaed4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c@@ -417,6 +417,10 @@ 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);
--
1.8.4.rc3
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