From: Zhen Lei <thunder.leizhen@huawei.com>
To: Tim Chen <tim.c.chen@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Subject: [PATCH 3/3] mm/swap: remove redundant check for swap_slot_cache_initialized
Date: Thu, 30 Apr 2020 14:11:43 +0800 [thread overview]
Message-ID: <20200430061143.450-4-thunder.leizhen@huawei.com> (raw)
In-Reply-To: <20200430061143.450-1-thunder.leizhen@huawei.com>
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>
---
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 b40394473a3c..3e6453573a89 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();
--
2.26.0.106.g9fadedd
next prev parent reply other threads:[~2020-04-30 6:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 6:11 [PATCH 0/3] clean up some functions in mm/swap_slots.c Zhen Lei
2020-04-30 6:11 ` [PATCH 1/3] mm/swap: simplify alloc_swap_slot_cache() Zhen Lei
2020-05-01 21:46 ` Tim Chen
2020-04-30 6:11 ` [PATCH 2/3] mm/swap: simplify enable_swap_slots_cache() Zhen Lei
2020-05-01 21:59 ` Tim Chen
2020-04-30 6:11 ` Zhen Lei [this message]
2020-05-01 22:35 ` [PATCH 3/3] mm/swap: remove redundant check for swap_slot_cache_initialized Tim Chen
2020-07-08 9:27 ` [PATCH 0/3] clean up some functions in mm/swap_slots.c Leizhen (ThunderTown)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200430061143.450-4-thunder.leizhen@huawei.com \
--to=thunder.leizhen@huawei.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tim.c.chen@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).