[PATCH 11/14] mm/swap: Make swap_address_space an inline function

[Mel Gorman]

make W=1 generates the following warning in page_mapping() for allnoconfig

  mm/util.c:700:15: warning: variable ‘entry’ set but not used [-Wunused-but-set-variable]
     swp_entry_t entry;
                 ^~~~~

swap_address is a #define on !CONFIG_SWAP configurations. Make the helper
an inline function to suppress the warning, add type checking and to apply
any side-effects in the parameter list.

Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---
 include/linux/swap.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 144727041e78..216462c78a91 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -526,7 +526,11 @@ static inline struct swap_info_struct *swp_swap_info(swp_entry_t entry)
 	return NULL;
 }
 
-#define swap_address_space(entry)		(NULL)
+static inline struct address_space *swap_address_space(swp_entry_t entry)
+{
+	return NULL;
+}
+
 #define get_nr_swap_pages()			0L
 #define total_swap_pages			0L
 #define total_swapcache_pages()			0UL
-- 
2.26.2