From e0f3ebba97f190ce988829ccc5b527e8eef40e01 Mon Sep 17 00:00:00 2001
From: Zhen Lei <thunder.leizhen@huawei.com>
Date: Thu, 6 Aug 2020 23:20:11 -0700
Subject: [PATCH] mm/swap_slots.c: remove redundant check for
swap_slot_cache_initialized
Because enable_swap_slots_cache can only become true in
enable_swap_slots_cache(), and depends on swap_slot_cache_initialized is
true before. That means, when enable_swap_slots_cache is true,
swap_slot_cache_initialized is true also.
So the condition:
"swap_slot_cache_enabled && swap_slot_cache_initialized"
can be reduced to "swap_slot_cache_enabled"
And in mathematics:
"!swap_slot_cache_enabled || !swap_slot_cache_initialized"
is equal to "!(swap_slot_cache_enabled && swap_slot_cache_initialized)"
So no functional change.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/20200430061143.450-4-thunder.leizhen@huawei.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/swap_slots.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/mm/swap_slots.c b/mm/swap_slots.c
index b40394473a3cd..3e6453573a898 100644
--- a/mm/swap_slots.c
+++ b/mm/swap_slots.c
@@ -46,8 +46,7 @@ static void __drain_swap_slots_cache(unsigned int type);
static void deactivate_swap_slots_cache(void);
static void reactivate_swap_slots_cache(void);
-#define use_swap_slot_cache (swap_slot_cache_active && \
- swap_slot_cache_enabled && swap_slot_cache_initialized)
+#define use_swap_slot_cache (swap_slot_cache_active && swap_slot_cache_enabled)
#define SLOTS_CACHE 0x1
#define SLOTS_CACHE_RET 0x2
@@ -94,7 +93,7 @@ static bool check_cache_active(void)
{
long pages;
- if (!swap_slot_cache_enabled || !swap_slot_cache_initialized)
+ if (!swap_slot_cache_enabled)
return false;
pages = get_nr_swap_pages();
--
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