[patch 62/69] frontswap: simplify frontswap_init

From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, ddstreet@ieee.org,
	geert@linux-m68k.org, hch@lst.de, hughd@google.com,
	jgross@suse.com, Konrad.wilk@oracle.com, linux-mm@kvack.org,
	mm-commits@vger.kernel.org, sjenning@redhat.com,
	torvalds@linux-foundation.org, vitaly.wool@konsulko.com,
	willy@infradead.org
Subject: [patch 62/69] frontswap: simplify frontswap_init
Date: Fri, 21 Jan 2022 22:14:51 -0800	[thread overview]
Message-ID: <20220122061451.xtrCwshPY%akpm@linux-foundation.org> (raw)
In-Reply-To: <20220121221021.60533b009c357d660791476e@linux-foundation.org>

From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: simplify frontswap_init

Just use IS_ENABLED() and remove the __frontswap_init indirection.
Also remove the unused export.

Link: https://lkml.kernel.org/r/20211224062246.1258487-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/frontswap.h |    9 +--------
 mm/frontswap.c            |    3 +--
 mm/swapfile.c             |    3 ++-
 3 files changed, 4 insertions(+), 11 deletions(-)

--- a/include/linux/frontswap.h~frontswap-simplify-frontswap_init
+++ a/include/linux/frontswap.h
@@ -26,7 +26,7 @@ struct frontswap_ops {
 extern void frontswap_register_ops(struct frontswap_ops *ops);
 
 extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
-extern void __frontswap_init(unsigned type, unsigned long *map);
+extern void frontswap_init(unsigned type, unsigned long *map);
 extern int __frontswap_store(struct page *page);
 extern int __frontswap_load(struct page *page);
 extern void __frontswap_invalidate_page(unsigned, pgoff_t);
@@ -107,11 +107,4 @@ static inline void frontswap_invalidate_
 		__frontswap_invalidate_area(type);
 }
 
-static inline void frontswap_init(unsigned type, unsigned long *map)
-{
-#ifdef CONFIG_FRONTSWAP
-	__frontswap_init(type, map);
-#endif
-}
-
 #endif /* _LINUX_FRONTSWAP_H */
--- a/mm/frontswap.c~frontswap-simplify-frontswap_init
+++ a/mm/frontswap.c
@@ -156,7 +156,7 @@ EXPORT_SYMBOL(frontswap_register_ops);
 /*
  * Called when a swap device is swapon'd.
  */
-void __frontswap_init(unsigned type, unsigned long *map)
+void frontswap_init(unsigned type, unsigned long *map)
 {
 	struct swap_info_struct *sis = swap_info[type];
 	struct frontswap_ops *ops;
@@ -179,7 +179,6 @@ void __frontswap_init(unsigned type, uns
 	for_each_frontswap_ops(ops)
 		ops->init(type);
 }
-EXPORT_SYMBOL(__frontswap_init);
 
 bool __frontswap_test(struct swap_info_struct *sis,
 				pgoff_t offset)
--- a/mm/swapfile.c~frontswap-simplify-frontswap_init
+++ a/mm/swapfile.c
@@ -2463,7 +2463,8 @@ static void enable_swap_info(struct swap
 				struct swap_cluster_info *cluster_info,
 				unsigned long *frontswap_map)
 {
-	frontswap_init(p->type, frontswap_map);
+	if (IS_ENABLED(CONFIG_FRONTSWAP))
+		frontswap_init(p->type, frontswap_map);
 	spin_lock(&swap_lock);
 	spin_lock(&p->lock);
 	setup_swap_info(p, prio, swap_map, cluster_info);
_
