linux-kernel - [PATCH 1/4] mm/swapfile.c: found_free could be represented by (tmp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200419013921.14390-1-richard.weiyang@gmail.com>
Date:   Sun, 19 Apr 2020 01:39:18 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        tim.c.chen@...ux.intel.com, ying.huang@...el.com,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 1/4] mm/swapfile.c: found_free could be represented by (tmp < max)

This is not necessary to use the variable found_free to record the
status. Just check tmp and max is enough.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 mm/swapfile.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index c457f3be6944..654bad5173bc 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -601,7 +601,6 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
 {
 	struct percpu_cluster *cluster;
 	struct swap_cluster_info *ci;
-	bool found_free;
 	unsigned long tmp, max;
 
 new_cluster:
@@ -623,8 +622,6 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
 			return false;
 	}
 
-	found_free = false;
-
 	/*
 	 * Other CPUs can use our cluster if they can't find a free cluster,
 	 * check if there is still free entry in the cluster
@@ -638,21 +635,19 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
 	}
 	ci = lock_cluster(si, tmp);
 	while (tmp < max) {
-		if (!si->swap_map[tmp]) {
-			found_free = true;
+		if (!si->swap_map[tmp])
 			break;
-		}
 		tmp++;
 	}
 	unlock_cluster(ci);
-	if (!found_free) {
+	if (tmp >= max) {
 		cluster_set_null(&cluster->index);
 		goto new_cluster;
 	}
 	cluster->next = tmp + 1;
 	*offset = tmp;
 	*scan_base = tmp;
-	return found_free;
+	return tmp < max;
 }
 
 static void __del_from_avail_list(struct swap_info_struct *p)
-- 
2.23.0