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From:   Liu Shixin <liushixin2@huawei.com>
To:     Seth Jennings <sjenning@redhat.com>,
        Dan Streetman <ddstreet@ieee.org>,
        Vitaly Wool <vitaly.wool@konsulko.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Nathan Chancellor <nathan@kernel.org>,
        "Christoph Hellwig" <hch@lst.de>
CC:     <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
        Liu Shixin <liushixin2@huawei.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: [PATCH v5 1/5] Revert "mm: mark swap_lock and swap_active_head static"
Date:   Thu, 15 Sep 2022 11:49:59 +0800
Message-ID: <20220915035003.3347466-2-liushixin2@huawei.com>
In-Reply-To: <20220915035003.3347466-1-liushixin2@huawei.com>
References: <20220915035003.3347466-1-liushixin2@huawei.com>
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This reverts commit 633423a09cb5cfe61438283e1ce49c23cf4a0611.

swap_lock and swap_active_head will be used in next patch, so export it
again.

Signed-off-by: Liu Shixin <liushixin2@huawei.com>
---
 include/linux/swapfile.h | 2 ++
 mm/swapfile.c            | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/swapfile.h b/include/linux/swapfile.h
index 7ed529a77c5b..a2540b8396e2 100644
--- a/include/linux/swapfile.h
+++ b/include/linux/swapfile.h
@@ -6,6 +6,8 @@
  * these were static in swapfile.c but frontswap.c needs them and we don't
  * want to expose them to the dozens of source files that include swap.h
  */
+extern spinlock_t swap_lock;
+extern struct plist_head swap_active_head;
 extern struct swap_info_struct *swap_info[];
 extern unsigned long generic_max_swapfile_size(void);
 unsigned long arch_max_swapfile_size(void);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 4efcfe34e45b..6cdb34c01dd3 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -51,7 +51,7 @@ static bool swap_count_continued(struct swap_info_struct *, pgoff_t,
 				 unsigned char);
 static void free_swap_count_continuations(struct swap_info_struct *);
 
-static DEFINE_SPINLOCK(swap_lock);
+DEFINE_SPINLOCK(swap_lock);
 static unsigned int nr_swapfiles;
 atomic_long_t nr_swap_pages;
 /*
@@ -77,7 +77,7 @@ static const char Unused_offset[] = "Unused swap offset entry ";
  * all active swap_info_structs
  * protected with swap_lock, and ordered by priority.
  */
-static PLIST_HEAD(swap_active_head);
+PLIST_HEAD(swap_active_head);
 
 /*
  * all available (active, not full) swap_info_structs
-- 
2.25.1