linux-kernel - [PATCH 4/5] mm/swap: remove unused global variable nr_swapper

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Date:   Tue, 18 May 2021 21:53:51 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 4/5] mm/swap: remove unused global variable nr_swapper_spaces

Since commit b6038942480e ("mm: memcg: add swapcache stat for memcg v2"),
the last user of nr_swapper_spaces is gone. So we remove this unused one.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/swap_state.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/swap_state.c b/mm/swap_state.c
index bab386c7b655..a55b7b74b0e6 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -37,7 +37,6 @@ static const struct address_space_operations swap_aops = {
 };
 
 struct address_space *swapper_spaces[MAX_SWAPFILES] __read_mostly;
-static unsigned int nr_swapper_spaces[MAX_SWAPFILES] __read_mostly;
 static bool enable_vma_readahead __read_mostly = true;
 
 #define SWAP_RA_WIN_SHIFT	(PAGE_SHIFT / 2)
@@ -686,7 +685,6 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
 		/* swap cache doesn't use writeback related tags */
 		mapping_set_no_writeback_tags(space);
 	}
-	nr_swapper_spaces[type] = nr;
 	swapper_spaces[type] = spaces;
 
 	return 0;
@@ -695,7 +693,6 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
 void exit_swap_address_space(unsigned int type)
 {
 	kvfree(swapper_spaces[type]);
-	nr_swapper_spaces[type] = 0;
 	swapper_spaces[type] = NULL;
 }
 
-- 
2.23.0