linux-kernel - [PATCH 11/14] mm/swap: Make swap_address

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Date:   Thu, 20 May 2021 09:48:06 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Streetman <ddstreet@...e.org>,
        Yang Shi <shy828301@...il.com>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 11/14] mm/swap: Make swap_address_space an inline function

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@...hsingularity.net>
---
 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