linux-kernel - [PATCH 05/13] frontswap: remove frontswap_curr

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Message-Id: <20211224062246.1258487-6-hch@lst.de>
Date:   Fri, 24 Dec 2021 07:22:38 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 05/13] frontswap: remove frontswap_curr_pages

frontswap_curr_pages is never called, so remove it.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/frontswap.h |  1 -
 mm/frontswap.c            | 28 ----------------------------
 2 files changed, 29 deletions(-)

diff --git a/include/linux/frontswap.h b/include/linux/frontswap.h
index d268d7bb65134..5205c2977b208 100644
--- a/include/linux/frontswap.h
+++ b/include/linux/frontswap.h
@@ -24,7 +24,6 @@ struct frontswap_ops {
 };
 
 extern void frontswap_register_ops(struct frontswap_ops *ops);
-extern unsigned long frontswap_curr_pages(void);
 
 extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
 extern void __frontswap_init(unsigned type, unsigned long *map);
diff --git a/mm/frontswap.c b/mm/frontswap.c
index a77ebba6101bd..af8f68d0e5cc0 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -330,34 +330,6 @@ void __frontswap_invalidate_area(unsigned type)
 }
 EXPORT_SYMBOL(__frontswap_invalidate_area);
 
-static unsigned long __frontswap_curr_pages(void)
-{
-	unsigned long totalpages = 0;
-	struct swap_info_struct *si = NULL;
-
-	assert_spin_locked(&swap_lock);
-	plist_for_each_entry(si, &swap_active_head, list)
-		totalpages += atomic_read(&si->frontswap_pages);
-	return totalpages;
-}
-
-/*
- * Count and return the number of frontswap pages across all
- * swap devices.  This is exported so that backend drivers can
- * determine current usage without reading debugfs.
- */
-unsigned long frontswap_curr_pages(void)
-{
-	unsigned long totalpages = 0;
-
-	spin_lock(&swap_lock);
-	totalpages = __frontswap_curr_pages();
-	spin_unlock(&swap_lock);
-
-	return totalpages;
-}
-EXPORT_SYMBOL(frontswap_curr_pages);
-
 static int __init init_frontswap(void)
 {
 #ifdef CONFIG_DEBUG_FS
-- 
2.30.2