From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Sat, 10 Oct 2020 15:47:55 +0000 (-0400)
Subject: mm: Fix READ_ONLY_THP warning
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=06d44142d49dc2e02d255ea9d72dc4c20f20388f;p=linux.git

mm: Fix READ_ONLY_THP warning

These counters only exist if CONFIG_READ_ONLY_THP_FOR_FS is defined,
but we do not need to warn if the filesystem natively supports large
folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a73c928e1d748..0a2417fc531c9 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -326,7 +326,7 @@ static inline void filemap_nr_thps_inc(struct address_space *mapping)
 	if (!mapping_large_folio_support(mapping))
 		atomic_inc(&mapping->nr_thps);
 #else
-	WARN_ON_ONCE(1);
+	WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);
 #endif
 }
 
@@ -336,7 +336,7 @@ static inline void filemap_nr_thps_dec(struct address_space *mapping)
 	if (!mapping_large_folio_support(mapping))
 		atomic_dec(&mapping->nr_thps);
 #else
-	WARN_ON_ONCE(1);
+	WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);
 #endif
 }